---
OA_place: publisher
OA_type: hybrid
PlanS_conform: '1'
_id: '21449'
abstract:
- lang: eng
text: Three-dimensional (3D) crystals offer a route to scaling up trapped-ion systems
for quantum sensing and quantum simulation applications; however, engineering
coherent spin-motion couplings and effective spin-spin interactions in large crystals
poses technical challenges associated with decoherence and prolonged timescales
to generate appreciable entanglement. Here, we explore the possibility of speeding
up these interactions in 3D crystals via parametric amplification. For this purpose,
we derive a general Hamiltonian for the parametric amplification of spin-motion
coupling that is broadly applicable to normal modes with motion transverse to
or along the spatial extent of the crystal. Unlike in lower-dimensional crystals,
we find that the ability to faithfully (uniformly) amplify the spin-spin interactions
in 3D crystals depends on the physical implementation of the spin-motion coupling.
We consider the light-shift gate, and the so-called phase-insensitive and phase-sensitive
Mølmer-Sørensen (MS) gates, and we find that only the phase-sensitive MS gate
can be faithfully amplified in general 3D crystals. We discuss a situation where
nonuniform amplification can be advantageous. We also reconsider the effect of
counter-rotating terms on parametric amplification and find that they are not
as detrimental as previous studies suggest.
acknowledgement: We thank Wenchao Ge and Allison Carter for feedback on the manuscript.
We also thank Wenchao Ge for sharing the numerical simulation data that we have
used in Fig. 5 of this paper. N.N. would like to thank Perimeter Institute and Boston
University for support during this research. S.H. acknowledges partial support from
the Institute of Science and Technology Austria and the Austrian Science Fund (FWF)
DOI 10.55776/F71 for the duration of this project. This work was supported by DOE
Quantum Systems Accelerator, ARO W911NF24-1-0128, and NSF JILA-PFC PHY-2317149.
J.J.B. and A.M.R. acknowledge support through AFOSR Grant No. FA9550-25-1-0080.
A.S. acknowledges support by the Department of Science and Technology, Govt. of
India through the INSPIRE Faculty Award (DST/INSPIRE/04/2023/001486), by the Anusandhan
National Research Foundation (ANRF), Govt. of India through the Prime Minister’s
Early Career Research Grant (PMECRG) (ANRF/ECRG/2024/001160/PMS) and by IIT Madras
through the New Faculty Initiation Grant (NFIG).
article_number: '034004'
article_processing_charge: Yes (via OA deal)
article_type: original
arxiv: 1
author:
- first_name: Samarth
full_name: Hawaldar, Samarth
id: 221708e1-1ff6-11ee-9fa6-85146607433e
last_name: Hawaldar
orcid: 0000-0002-1965-4309
- first_name: N.
full_name: Nikhil, N.
last_name: Nikhil
- first_name: Ana Maria
full_name: Rey, Ana Maria
last_name: Rey
- first_name: John J.
full_name: Bollinger, John J.
last_name: Bollinger
- first_name: Athreya
full_name: Shankar, Athreya
last_name: Shankar
citation:
ama: Hawaldar S, Nikhil N, Rey AM, Bollinger JJ, Shankar A. Parametric amplification
of spin-motion coupling in three-dimensional trapped-ion crystals. Physical
Review Applied. 2026;25(3). doi:10.1103/h1m9-h3yw
apa: Hawaldar, S., Nikhil, N., Rey, A. M., Bollinger, J. J., & Shankar, A. (2026).
Parametric amplification of spin-motion coupling in three-dimensional trapped-ion
crystals. Physical Review Applied. American Physical Society. https://doi.org/10.1103/h1m9-h3yw
chicago: Hawaldar, Samarth, N. Nikhil, Ana Maria Rey, John J. Bollinger, and Athreya
Shankar. “Parametric Amplification of Spin-Motion Coupling in Three-Dimensional
Trapped-Ion Crystals.” Physical Review Applied. American Physical Society,
2026. https://doi.org/10.1103/h1m9-h3yw.
ieee: S. Hawaldar, N. Nikhil, A. M. Rey, J. J. Bollinger, and A. Shankar, “Parametric
amplification of spin-motion coupling in three-dimensional trapped-ion crystals,”
Physical Review Applied, vol. 25, no. 3. American Physical Society, 2026.
ista: Hawaldar S, Nikhil N, Rey AM, Bollinger JJ, Shankar A. 2026. Parametric amplification
of spin-motion coupling in three-dimensional trapped-ion crystals. Physical Review
Applied. 25(3), 034004.
mla: Hawaldar, Samarth, et al. “Parametric Amplification of Spin-Motion Coupling
in Three-Dimensional Trapped-Ion Crystals.” Physical Review Applied, vol.
25, no. 3, 034004, American Physical Society, 2026, doi:10.1103/h1m9-h3yw.
short: S. Hawaldar, N. Nikhil, A.M. Rey, J.J. Bollinger, A. Shankar, Physical Review
Applied 25 (2026).
corr_author: '1'
date_created: 2026-03-15T23:01:35Z
date_published: 2026-03-01T00:00:00Z
date_updated: 2026-04-14T09:04:08Z
day: '01'
ddc:
- '530'
department:
- _id: JoFi
- _id: GradSch
doi: 10.1103/h1m9-h3yw
external_id:
arxiv:
- '2507.16741'
file:
- access_level: open_access
checksum: f0dc6a50222b778fd75cc72a28d38689
content_type: application/pdf
creator: dernst
date_created: 2026-03-16T09:24:53Z
date_updated: 2026-03-16T09:24:53Z
file_id: '21456'
file_name: 2026_PhysicalReviewApplied_Hawaldar.pdf
file_size: 1421954
relation: main_file
success: 1
file_date_updated: 2026-03-16T09:24:53Z
has_accepted_license: '1'
intvolume: ' 25'
issue: '3'
language:
- iso: eng
month: '03'
oa: 1
oa_version: Published Version
project:
- _id: bdb108fd-d553-11ed-ba76-83dc74a9864f
grant_number: F07105
name: QUANTUM INFORMATION SYSTEMS BEYOND CLASSICAL CAPABILITIES / P5- Integration
of Superconducting Quantum Circuits
publication: Physical Review Applied
publication_identifier:
eissn:
- 2331-7019
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Parametric amplification of spin-motion coupling in three-dimensional trapped-ion
crystals
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 25
year: '2026'
...
---
DOAJ_listed: '1'
OA_place: publisher
OA_type: gold
PlanS_conform: '1'
_id: '20664'
abstract:
- lang: eng
text: Conference travel contributes to the climate footprint of academic research.
Here, we provide a quantitative estimate of the carbon emissions associated with
conference attendance by analyzing travel data from participants of 10 international
conferences in the field of magnetic resonance, namely EUROMAR, ENC and ICMRBS.
We find that attending a EUROMAR conference produces, on average, more than 1 t CO2 eq..
For the analyzed conferences outside Europe, the corresponding value is about
2–3 times higher, on average, with intercontinental trips amounting to up to 5 t.
We compare these conference-related emissions to other activities associated with
research and show that conference travel is a substantial portion of the total
climate footprint of a researcher in magnetic resonance. We explore several strategies
to reduce these emissions, including the impact of selecting conference venues
more strategically and the possibility of decentralized conferences. Through a
detailed comparison of train versus air travel – accounting for both direct and
infrastructure-related emissions – we demonstrate that train travel offers considerable
carbon savings. These data may provide a basis for strategic choices of future
conferences in the field and for individuals deciding on their conference attendance.
acknowledgement: 'First and foremost, we are grateful to the conference organizers
who have provided data, either in the form of tables or by pointing us to abstract
books. We thank the reviewers and the handling editor (Gottfried Otting) for the
careful reading and suggestions. This project emerged from an interactive course
about energy and climate, held at IST Austria by Jeroen Dobbelaere, Georgios Katsaros
and Paul Schanda. We are grateful to ISTA''s Graduate School for enabling this interdisciplinary
course and to all participating students. We thank the following persons for discussions
and/or comments about the manuscript: Helene Van Melckebeke, Mei Hong, Jeff Hoch,
Gottfried Otting and Matthias Ernst. For the preparation of the manuscript, AI tools
have been used, namely for finding relevant literature (ChatGPT) and for correcting
the text (Writefull, within Overleaf LaTeX).'
article_processing_charge: Yes
article_type: original
author:
- first_name: Lucky
full_name: Kapoor, Lucky
id: 84b9700b-15b2-11ec-abd3-831089e67615
last_name: Kapoor
orcid: 0000-0001-8319-2148
- first_name: Natalia
full_name: Ruzickova, Natalia
id: D2761128-D73D-11E9-A1BF-BA0DE6697425
last_name: Ruzickova
- first_name: Predrag
full_name: Zivadinovic, Predrag
id: 68AA0E5A-AFDA-11E9-9994-141DE6697425
last_name: Zivadinovic
- first_name: Valentin
full_name: Leitner, Valentin
id: 4c665ce3-0016-11ec-bea0-e44de7a4fa3d
last_name: Leitner
- first_name: Maria A
full_name: Sisak, Maria A
id: 44A03D04-AEA4-11E9-B225-EA2DE6697425
last_name: Sisak
- first_name: Cecelia N
full_name: Mweka, Cecelia N
id: 2a69ab4b-896a-11ed-bdf8-cb8641cf2b21
last_name: Mweka
- first_name: Jeroen A
full_name: Dobbelaere, Jeroen A
id: c15a5412-de82-11ed-b809-8dc1aa996e40
last_name: Dobbelaere
- first_name: Georgios
full_name: Katsaros, Georgios
id: 38DB5788-F248-11E8-B48F-1D18A9856A87
last_name: Katsaros
orcid: 0000-0001-8342-202X
- first_name: Paul
full_name: Schanda, Paul
id: 7B541462-FAF6-11E9-A490-E8DFE5697425
last_name: Schanda
orcid: 0000-0002-9350-7606
citation:
ama: 'Kapoor L, Ruzickova N, Zivadinovic P, et al. Quantifying the carbon footprint
of conference travel: The case of NMR meetings. Magnetic Resonance. 2025;6(2):243-256.
doi:10.5194/mr-6-243-2025'
apa: 'Kapoor, L., Ruzickova, N., Zivadinovic, P., Leitner, V., Sisak, M. A., Mweka,
C. N., … Schanda, P. (2025). Quantifying the carbon footprint of conference travel:
The case of NMR meetings. Magnetic Resonance. Copernicus Publications.
https://doi.org/10.5194/mr-6-243-2025'
chicago: 'Kapoor, Lucky, Natalia Ruzickova, Predrag Zivadinovic, Valentin Leitner,
Maria A Sisak, Cecelia N Mweka, Jeroen A Dobbelaere, Georgios Katsaros, and Paul
Schanda. “Quantifying the Carbon Footprint of Conference Travel: The Case of NMR
Meetings.” Magnetic Resonance. Copernicus Publications, 2025. https://doi.org/10.5194/mr-6-243-2025.'
ieee: 'L. Kapoor et al., “Quantifying the carbon footprint of conference
travel: The case of NMR meetings,” Magnetic Resonance, vol. 6, no. 2. Copernicus
Publications, pp. 243–256, 2025.'
ista: 'Kapoor L, Ruzickova N, Zivadinovic P, Leitner V, Sisak MA, Mweka CN, Dobbelaere
JA, Katsaros G, Schanda P. 2025. Quantifying the carbon footprint of conference
travel: The case of NMR meetings. Magnetic Resonance. 6(2), 243–256.'
mla: 'Kapoor, Lucky, et al. “Quantifying the Carbon Footprint of Conference Travel:
The Case of NMR Meetings.” Magnetic Resonance, vol. 6, no. 2, Copernicus
Publications, 2025, pp. 243–56, doi:10.5194/mr-6-243-2025.'
short: L. Kapoor, N. Ruzickova, P. Zivadinovic, V. Leitner, M.A. Sisak, C.N. Mweka,
J.A. Dobbelaere, G. Katsaros, P. Schanda, Magnetic Resonance 6 (2025) 243–256.
corr_author: '1'
date_created: 2025-11-23T23:01:39Z
date_published: 2025-11-10T00:00:00Z
date_updated: 2025-11-24T08:31:34Z
day: '10'
ddc:
- '000'
department:
- _id: JoFi
- _id: GaTk
- _id: JoCs
- _id: EvBe
- _id: TaHa
- _id: GradSch
- _id: GeKa
- _id: PaSc
doi: 10.5194/mr-6-243-2025
file:
- access_level: open_access
checksum: c63dd47b0e77f9451821436bb77d27c9
content_type: application/pdf
creator: dernst
date_created: 2025-11-24T08:25:19Z
date_updated: 2025-11-24T08:25:19Z
file_id: '20672'
file_name: 2025_MagneticResonance_Kapoor.pdf
file_size: 3081399
relation: main_file
success: 1
file_date_updated: 2025-11-24T08:25:19Z
has_accepted_license: '1'
intvolume: ' 6'
issue: '2'
language:
- iso: eng
month: '11'
oa: 1
oa_version: Published Version
page: 243-256
publication: Magnetic Resonance
publication_identifier:
eissn:
- 2699-0016
publication_status: published
publisher: Copernicus Publications
quality_controlled: '1'
related_material:
record:
- id: '20242'
relation: research_data
status: public
scopus_import: '1'
status: public
title: 'Quantifying the carbon footprint of conference travel: The case of NMR meetings'
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 6
year: '2025'
...
---
DOAJ_listed: '1'
OA_place: publisher
OA_type: gold
_id: '19401'
abstract:
- lang: eng
text: High kinetic inductance superconductors are gaining increasing interest for
the realisation of qubits, amplifiers and detectors. Moreover, thanks to their
high impedance, quantum buses made of such materials enable large zero-point fluctuations
of the voltage, boosting the coupling rates to spin and charge qubits. However,
fully exploiting the potential of disordered or granular superconductors is challenging,
as their inductance and, therefore, impedance at high values are difficult to
control. Here, we report a reproducible fabrication of granular aluminium resonators
by developing a wireless ohmmeter, which allows in situ measurements during film
deposition and, therefore, control of the kinetic inductance of granular aluminium
films. Reproducible fabrication of circuits with impedances (inductances) exceeding
13 kΩ (1 nH per square) is now possible. By integrating a 7.9 kΩ resonator with
a germanium double quantum dot, we demonstrate strong charge-photon coupling with
a rate of gc/2π = 566 ± 2 MHz. This broadly applicable method opens the path for
novel qubits and high-fidelity, long-distance two-qubit gates.
acknowledged_ssus:
- _id: M-Shop
- _id: NanoFab
acknowledgement: 'We acknowledge Franco De Palma, Mahya Khorramshahi, Fabian Oppliger,
Thomas Reisinger, Pasquale Scarlino and Xiao Xue for helpful discussions. We thank
Simon Robson for proofreading the manuscript. This research was supported by the
Scientific Service Units of ISTA through resources provided by the MIBA Machine
Shop and the Nanofabrication facility. This research and related results were made
possible with the support of the NOMIS Foundation and the HORIZON-RIA 101069515
project. This research was funded in whole or in part by the Austrian Science Fund
(FWF) https://doi.org/10.55776/P32235, https://doi.org/10.55776/I5060 and https://doi.org/10.55776/P36507.
For Open Access purposes, the author has applied a CC BY public copyright license
to any author accepted manuscript version arising from this submission. M.J. acknowledges
funding from FellowQUTE 2024-01. K.R. acknowledges funding from the European Union’s
Horizon 2020 research and innovation program under the Marie Skłodowska-Curie Grant
Agreement No. 101034413. I.M.P. acknowledges funding from the Deutsche Forschungsgemeinschaft
(DFG - German Research Foundation) under project number 450396347 (GeHoldeQED).
ICN2 acknowledges funding from Generalitat de Catalunya 2021SGR00457. We acknowledge
support from CSIC Interdisciplinary Thematic Platform (PTI+) on Quantum Technologies
(PTI-QTEP+). This research work has been funded by the European Commission - NextGenerationEU
(Regulation EU 2020/2094), through CSIC’s Quantum Technologies Platform (QTEP).
ICN2 is supported by the Severo Ochoa programme from Spanish MCIN/AEI (Grant No.:
CEX2021-001214-S) and is funded by the CERCA Programme/Generalitat de Catalunya.
Part of the present work has been performed in the framework of Universitat Autònoma
de Barcelona Materials Science PhD programme. AGM has received funding from Grant
RYC2021-033479-I funded by MCIN/AEI/10.13039/501100011033 and by European Union
NextGenerationEU/PRTR. M.B. acknowledges support from SUR Generalitat de Catalunya
and the EU Social Fund; project ref. 2020 FI 00103. The authors acknowledge the
use of instrumentation and the technical advice provided by the Joint Electron Microscopy
Centre at ALBA (JEMCA). ICN2 acknowledges funding from Grant IU16-014206 (METCAM-FIB)
funded by the European Union through the European Regional Development Fund (ERDF),
with the support of the Ministry of Research and Universities, Generalitat de Catalunya.
ICN2 is a founding member of e-DREAM60.'
article_number: '2103'
article_processing_charge: Yes
article_type: original
arxiv: 1
author:
- first_name: Marian
full_name: Janik, Marian
id: 396A1950-F248-11E8-B48F-1D18A9856A87
last_name: Janik
orcid: 0009-0003-9037-8831
- first_name: Kevin Etienne Robert
full_name: Roux, Kevin Etienne Robert
id: 53f93ea2-803f-11ed-ab7e-b283135794ef
last_name: Roux
- first_name: Carla N
full_name: Borja Espinosa, Carla N
id: 18777c01-896a-11ed-bdf8-e4851dc07d16
last_name: Borja Espinosa
- first_name: Oliver
full_name: Sagi, Oliver
id: 71616374-A8E9-11E9-A7CA-09ECE5697425
last_name: Sagi
- first_name: Abdulhamid
full_name: Baghdadi, Abdulhamid
id: 160D87FA-96B5-11E9-BF77-7626E6697425
last_name: Baghdadi
- first_name: Thomas
full_name: Adletzberger, Thomas
id: 38756BB2-F248-11E8-B48F-1D18A9856A87
last_name: Adletzberger
- first_name: Stefano
full_name: Calcaterra, Stefano
last_name: Calcaterra
- first_name: Marc
full_name: Botifoll, Marc
last_name: Botifoll
- first_name: Alba
full_name: Garzón Manjón, Alba
last_name: Garzón Manjón
- first_name: Jordi
full_name: Arbiol, Jordi
last_name: Arbiol
- first_name: Daniel
full_name: Chrastina, Daniel
last_name: Chrastina
- first_name: Giovanni
full_name: Isella, Giovanni
last_name: Isella
- first_name: Ioan M.
full_name: Pop, Ioan M.
last_name: Pop
- first_name: Georgios
full_name: Katsaros, Georgios
id: 38DB5788-F248-11E8-B48F-1D18A9856A87
last_name: Katsaros
orcid: 0000-0001-8342-202X
citation:
ama: Janik M, Roux KER, Borja Espinosa CN, et al. Strong charge-photon coupling
in planar germanium enabled by granular aluminium superinductors. Nature Communications.
2025;16. doi:10.1038/s41467-025-57252-4
apa: Janik, M., Roux, K. E. R., Borja Espinosa, C. N., Sagi, O., Baghdadi, A., Adletzberger,
T., … Katsaros, G. (2025). Strong charge-photon coupling in planar germanium enabled
by granular aluminium superinductors. Nature Communications. Springer Nature.
https://doi.org/10.1038/s41467-025-57252-4
chicago: Janik, Marian, Kevin Etienne Robert Roux, Carla N Borja Espinosa, Oliver
Sagi, Abdulhamid Baghdadi, Thomas Adletzberger, Stefano Calcaterra, et al. “Strong
Charge-Photon Coupling in Planar Germanium Enabled by Granular Aluminium Superinductors.”
Nature Communications. Springer Nature, 2025. https://doi.org/10.1038/s41467-025-57252-4.
ieee: M. Janik et al., “Strong charge-photon coupling in planar germanium
enabled by granular aluminium superinductors,” Nature Communications, vol.
16. Springer Nature, 2025.
ista: Janik M, Roux KER, Borja Espinosa CN, Sagi O, Baghdadi A, Adletzberger T,
Calcaterra S, Botifoll M, Garzón Manjón A, Arbiol J, Chrastina D, Isella G, Pop
IM, Katsaros G. 2025. Strong charge-photon coupling in planar germanium enabled
by granular aluminium superinductors. Nature Communications. 16, 2103.
mla: Janik, Marian, et al. “Strong Charge-Photon Coupling in Planar Germanium Enabled
by Granular Aluminium Superinductors.” Nature Communications, vol. 16,
2103, Springer Nature, 2025, doi:10.1038/s41467-025-57252-4.
short: M. Janik, K.E.R. Roux, C.N. Borja Espinosa, O. Sagi, A. Baghdadi, T. Adletzberger,
S. Calcaterra, M. Botifoll, A. Garzón Manjón, J. Arbiol, D. Chrastina, G. Isella,
I.M. Pop, G. Katsaros, Nature Communications 16 (2025).
corr_author: '1'
date_created: 2025-03-16T23:01:23Z
date_published: 2025-03-01T00:00:00Z
date_updated: 2025-09-30T11:03:35Z
day: '01'
ddc:
- '530'
department:
- _id: GeKa
- _id: JoFi
- _id: M-Shop
doi: 10.1038/s41467-025-57252-4
ec_funded: 1
external_id:
arxiv:
- '2407.03079'
isi:
- '001434774800001'
pmid:
- '40025007'
file:
- access_level: open_access
checksum: a9383dd978ca2c50b7dded6c0bb2cd49
content_type: application/pdf
creator: dernst
date_created: 2025-03-17T10:53:32Z
date_updated: 2025-03-17T10:53:32Z
file_id: '19415'
file_name: 2025_NatureComm_Janik.pdf
file_size: 6364878
relation: main_file
success: 1
file_date_updated: 2025-03-17T10:53:32Z
has_accepted_license: '1'
intvolume: ' 16'
isi: 1
language:
- iso: eng
month: '03'
oa: 1
oa_version: Published Version
pmid: 1
project:
- _id: 34c0acea-11ca-11ed-8bc3-8775e10fd452
grant_number: '101069515'
name: Integrated Germanium Quantum Technology
- _id: 237B3DA4-32DE-11EA-91FC-C7463DDC885E
call_identifier: FWF
grant_number: P32235
name: Towards scalable hut wire quantum devices
- _id: c0977eea-5a5b-11eb-8a69-a862db0cf4d1
grant_number: I05060
name: High impedance circuit quantum electrodynamics with hole spins
- _id: bd8bd29e-d553-11ed-ba76-f0070d4b237a
grant_number: P36507
name: Merging spin and superconducting qubits in planar Ge
- _id: fc2ed2f7-9c52-11eb-aca3-c01059dda49c
call_identifier: H2020
grant_number: '101034413'
name: 'IST-BRIDGE: International postdoctoral program'
publication: Nature Communications
publication_identifier:
eissn:
- 2041-1723
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
related_material:
record:
- id: '18144'
relation: earlier_version
status: public
- id: '18886'
relation: research_data
status: public
scopus_import: '1'
status: public
title: Strong charge-photon coupling in planar germanium enabled by granular aluminium
superinductors
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 16
year: '2025'
...
---
OA_place: publisher
OA_type: hybrid
_id: '19617'
abstract:
- lang: eng
text: In this article, we propose a method for generating single microwave photons
in superconducting circuits. We theoretically show that pure single microwave
photons can be generated on demand and tuned over a large frequency band by making
use of Landau-Zener transitions under a rapid sweep of a control parameter. We
devise a protocol that enables fast control of the frequency of the emitted photon
over two octaves, without requiring extensive calibration. Additionally, we make
theoretical estimates of the generation efficiency, tunability, purity, and linewidth
of the photons emitted using this method for both charge- and flux-qubit-based
architectures. We also provide estimates of the optimal device parameters required
for these architectures to realize the device.
acknowledgement: The authors acknowledge the support of DST-INSPIRE Fellowship No.
IF180339 and DST-SERB Core Research Grant No. CRG/2018/002129. S.H. acknowledges
the support of the Kishore Vaigyanik Protsahan Yojana (KVPY). S.H. also acknowledges
helpful discussions with Harsh Arora and Johannes Fink.
article_number: '044042'
article_processing_charge: Yes (via OA deal)
article_type: original
author:
- first_name: Samarth
full_name: Hawaldar, Samarth
id: 221708e1-1ff6-11ee-9fa6-85146607433e
last_name: Hawaldar
orcid: 0000-0002-1965-4309
- first_name: Siddhi Satish
full_name: Khaire, Siddhi Satish
last_name: Khaire
- first_name: Per
full_name: Delsing, Per
last_name: Delsing
- first_name: Baladitya
full_name: Suri, Baladitya
last_name: Suri
citation:
ama: Hawaldar S, Khaire SS, Delsing P, Suri B. On-demand single-microwave-photon
source in a superconducting circuit with wideband frequency tunability. Physical
Review Applied. 2025;23(4). doi:10.1103/physrevapplied.23.044042
apa: Hawaldar, S., Khaire, S. S., Delsing, P., & Suri, B. (2025). On-demand
single-microwave-photon source in a superconducting circuit with wideband frequency
tunability. Physical Review Applied. American Physical Society. https://doi.org/10.1103/physrevapplied.23.044042
chicago: Hawaldar, Samarth, Siddhi Satish Khaire, Per Delsing, and Baladitya Suri.
“On-Demand Single-Microwave-Photon Source in a Superconducting Circuit with Wideband
Frequency Tunability.” Physical Review Applied. American Physical Society,
2025. https://doi.org/10.1103/physrevapplied.23.044042.
ieee: S. Hawaldar, S. S. Khaire, P. Delsing, and B. Suri, “On-demand single-microwave-photon
source in a superconducting circuit with wideband frequency tunability,” Physical
Review Applied, vol. 23, no. 4. American Physical Society, 2025.
ista: Hawaldar S, Khaire SS, Delsing P, Suri B. 2025. On-demand single-microwave-photon
source in a superconducting circuit with wideband frequency tunability. Physical
Review Applied. 23(4), 044042.
mla: Hawaldar, Samarth, et al. “On-Demand Single-Microwave-Photon Source in a Superconducting
Circuit with Wideband Frequency Tunability.” Physical Review Applied, vol.
23, no. 4, 044042, American Physical Society, 2025, doi:10.1103/physrevapplied.23.044042.
short: S. Hawaldar, S.S. Khaire, P. Delsing, B. Suri, Physical Review Applied 23
(2025).
corr_author: '1'
date_created: 2025-04-24T06:34:07Z
date_published: 2025-04-18T00:00:00Z
date_updated: 2025-09-30T12:17:33Z
day: '18'
ddc:
- '539'
department:
- _id: GradSch
- _id: JoFi
doi: 10.1103/physrevapplied.23.044042
external_id:
isi:
- '001490745300002'
file:
- access_level: open_access
checksum: 582b2ed6afb654300cabf0e3add14ca8
content_type: application/pdf
creator: shawalda
date_created: 2025-04-24T06:40:22Z
date_updated: 2025-04-24T06:40:22Z
file_id: '19620'
file_name: PhysRevApplied.23.044042.pdf
file_size: 837219
relation: main_file
success: 1
file_date_updated: 2025-04-24T06:40:22Z
has_accepted_license: '1'
intvolume: ' 23'
isi: 1
issue: '4'
language:
- iso: eng
month: '04'
oa: 1
oa_version: Published Version
publication: Physical Review Applied
publication_identifier:
issn:
- 2331-7019
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: On-demand single-microwave-photon source in a superconducting circuit with
wideband frequency tunability
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 23
year: '2025'
...
---
OA_place: repository
OA_type: green
_id: '20927'
abstract:
- lang: eng
text: Cavity-magnon polaritons are hybrid excitations from the interaction between
cavity photons and magnons, the quanta of collective spin oscillations. Along
with the tunability of the magnon-photon coupling strength, fast information transfer
and conversion speed are desired in hybrid devices. This can be achieved utilizing
the propagating nature of spin waves with nonzero momentum for their ultrafast
time dynamics and reduced ohmic dissipation. Antiferromagnets are particularly
interesting as hosts for magnons since stray-field interactions are minimized
and they support multiple modes with distinctive magnetic-field behavior across
the phase diagram. Chromium trichloride (CrCl3) is a van der Waals layered antiferromagnet
having a strong easy-plane anisotropy and a weak in-plane easy-axis anisotropy.
Despite some magnetic resonance studies, the impact of magnetic reorientation
of spins in CrCl3 on the cavity-magnon-polariton interaction strength as a function
of magnetic field remains largely unexplored. In this study, we investigate the
coupling between magnons in CrCl3 and photons in a coplanar waveguide resonator
as a function of magnetic field. In particular, we find that the magnon-photon
coupling strength varies nonmonotonically and distinctly with the magnetic field
for the acoustic and the optical magnons, which can be utilized to tune the magnon-photon
coupling strength using an external magnetic field as a knob. We find the signature
of spin-flop transition in the two harmonics of the cavity due to a stronger dispersive
coupling between optical magnons and cavity photons at lower fields. Additionally,
we find standing modes formed by spin waves with nonzero momentum associated with
the two hybrid magnons when the external field is applied at an angle with the
crystal plane. These modes do not undergo substantial coupling with the cavity
mode unlike the antiferromagnetic modes and can be used as low-loss propagation
channels in hybrid devices.
acknowledgement: We thank R. Vijayaraghavan, V. Singh, A. Kamra, A. Barman, M. Patankar,
S. Kundu, S. Hazra, S. Sahu, A. Riswadkar, A. Bhattacharjee, and S. Das for helpful
discussions and experimental assistance. We acknowledge the Swarnajayanti Fellowship
of the Department of Science and Technology (for M.M.D.), DST Nanomission Grant
No. SR/NM/NS-45/2016, SERB SUPRA Grant No. SPR/2019/001247, ONRG Grant No. N62909–18-1–2058,
and the Department of Atomic Energy of the Government of India Grant No. 12-R&D-TFR5.10–0100
for support.
article_number: '214443'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Supriya
full_name: Mandal, Supriya
last_name: Mandal
- first_name: Krishnendu
full_name: Maji, Krishnendu
id: 76bc9e9f-ba0b-11ee-8184-90edabd17a58
last_name: Maji
- first_name: Lucky
full_name: Kapoor, Lucky
id: 84b9700b-15b2-11ec-abd3-831089e67615
last_name: Kapoor
orcid: 0000-0001-8319-2148
- first_name: Souvik
full_name: Sasmal, Souvik
last_name: Sasmal
- first_name: Soham
full_name: Manni, Soham
last_name: Manni
- first_name: John
full_name: Jesudasan, John
last_name: Jesudasan
- first_name: Pratap
full_name: Raychaudhuri, Pratap
last_name: Raychaudhuri
- first_name: Arumugam
full_name: Thamizhavel, Arumugam
last_name: Thamizhavel
- first_name: Mandar M.
full_name: Deshmukh, Mandar M.
last_name: Deshmukh
citation:
ama: Mandal S, Maji K, Kapoor L, et al. Cavity based sensing of antiferromagnetic
canting and nonzero-momentum spin waves in a van der Waals cavity-magnon-polariton
system. Physical Review B. 2025;112(21). doi:10.1103/bdd1-b8ys
apa: Mandal, S., Maji, K., Kapoor, L., Sasmal, S., Manni, S., Jesudasan, J., … Deshmukh,
M. M. (2025). Cavity based sensing of antiferromagnetic canting and nonzero-momentum
spin waves in a van der Waals cavity-magnon-polariton system. Physical Review
B. American Physical Society. https://doi.org/10.1103/bdd1-b8ys
chicago: Mandal, Supriya, Krishnendu Maji, Lucky Kapoor, Souvik Sasmal, Soham Manni,
John Jesudasan, Pratap Raychaudhuri, Arumugam Thamizhavel, and Mandar M. Deshmukh.
“Cavity Based Sensing of Antiferromagnetic Canting and Nonzero-Momentum Spin Waves
in a van Der Waals Cavity-Magnon-Polariton System.” Physical Review B.
American Physical Society, 2025. https://doi.org/10.1103/bdd1-b8ys.
ieee: S. Mandal et al., “Cavity based sensing of antiferromagnetic canting
and nonzero-momentum spin waves in a van der Waals cavity-magnon-polariton system,”
Physical Review B, vol. 112, no. 21. American Physical Society, 2025.
ista: Mandal S, Maji K, Kapoor L, Sasmal S, Manni S, Jesudasan J, Raychaudhuri P,
Thamizhavel A, Deshmukh MM. 2025. Cavity based sensing of antiferromagnetic canting
and nonzero-momentum spin waves in a van der Waals cavity-magnon-polariton system.
Physical Review B. 112(21), 214443.
mla: Mandal, Supriya, et al. “Cavity Based Sensing of Antiferromagnetic Canting
and Nonzero-Momentum Spin Waves in a van Der Waals Cavity-Magnon-Polariton System.”
Physical Review B, vol. 112, no. 21, 214443, American Physical Society,
2025, doi:10.1103/bdd1-b8ys.
short: S. Mandal, K. Maji, L. Kapoor, S. Sasmal, S. Manni, J. Jesudasan, P. Raychaudhuri,
A. Thamizhavel, M.M. Deshmukh, Physical Review B 112 (2025).
date_created: 2026-01-04T23:01:34Z
date_published: 2025-12-19T00:00:00Z
date_updated: 2026-01-05T10:07:04Z
day: '19'
department:
- _id: MaIb
- _id: JoFi
doi: 10.1103/bdd1-b8ys
external_id:
arxiv:
- '2512.05236'
intvolume: ' 112'
issue: '21'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.48550/arXiv.2512.05236
month: '12'
oa: 1
oa_version: Preprint
publication: Physical Review B
publication_identifier:
eissn:
- 2469-9969
issn:
- 2469-9950
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
related_material:
record:
- id: '20940'
relation: research_data
status: public
scopus_import: '1'
status: public
title: Cavity based sensing of antiferromagnetic canting and nonzero-momentum spin
waves in a van der Waals cavity-magnon-polariton system
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 112
year: '2025'
...
---
OA_place: repository
OA_type: green
_id: '20940'
abstract:
- lang: eng
text: These are the raw data files that supplement our study of mode dispersion
with magnetic field of a cavity-magnonics system containing chromium trichloride
on coplanar waveguide resonator.
article_processing_charge: No
author:
- first_name: Supriya
full_name: Mandal, Supriya
last_name: Mandal
- first_name: Krishnendu
full_name: Maji, Krishnendu
id: 76bc9e9f-ba0b-11ee-8184-90edabd17a58
last_name: Maji
- first_name: Lucky
full_name: Kapoor, Lucky
id: 84b9700b-15b2-11ec-abd3-831089e67615
last_name: Kapoor
orcid: 0000-0001-8319-2148
- first_name: Souvik
full_name: Sasmal, Souvik
last_name: Sasmal
- first_name: Soham
full_name: Manni, Soham
last_name: Manni
- first_name: John
full_name: Jesudasan, John
last_name: Jesudasan
- first_name: Pratap
full_name: Raychaudhuri, Pratap
last_name: Raychaudhuri
- first_name: Arumugam
full_name: Thamizhavel, Arumugam
last_name: Thamizhavel
- first_name: Mandar M.
full_name: Deshmukh, Mandar M.
last_name: Deshmukh
citation:
ama: Mandal S, Maji K, Kapoor L, et al. Mode dispersion with magnetic field in a
cavity-magnonics system. 2025. doi:10.5281/ZENODO.15321721
apa: Mandal, S., Maji, K., Kapoor, L., Sasmal, S., Manni, S., Jesudasan, J., … Deshmukh,
M. M. (2025). Mode dispersion with magnetic field in a cavity-magnonics system.
Zenodo. https://doi.org/10.5281/ZENODO.15321721
chicago: Mandal, Supriya, Krishnendu Maji, Lucky Kapoor, Souvik Sasmal, Soham Manni,
John Jesudasan, Pratap Raychaudhuri, Arumugam Thamizhavel, and Mandar M. Deshmukh.
“Mode Dispersion with Magnetic Field in a Cavity-Magnonics System.” Zenodo, 2025.
https://doi.org/10.5281/ZENODO.15321721.
ieee: S. Mandal et al., “Mode dispersion with magnetic field in a cavity-magnonics
system.” Zenodo, 2025.
ista: Mandal S, Maji K, Kapoor L, Sasmal S, Manni S, Jesudasan J, Raychaudhuri P,
Thamizhavel A, Deshmukh MM. 2025. Mode dispersion with magnetic field in a cavity-magnonics
system, Zenodo, 10.5281/ZENODO.15321721.
mla: Mandal, Supriya, et al. Mode Dispersion with Magnetic Field in a Cavity-Magnonics
System. Zenodo, 2025, doi:10.5281/ZENODO.15321721.
short: S. Mandal, K. Maji, L. Kapoor, S. Sasmal, S. Manni, J. Jesudasan, P. Raychaudhuri,
A. Thamizhavel, M.M. Deshmukh, (2025).
date_created: 2026-01-05T10:00:06Z
date_published: 2025-05-02T00:00:00Z
date_updated: 2026-01-05T10:07:04Z
day: '02'
department:
- _id: MaIb
- _id: JoFi
doi: 10.5281/ZENODO.15321721
has_accepted_license: '1'
main_file_link:
- open_access: '1'
url: https://doi.org/10.5281/ZENODO.15321721
month: '05'
oa: 1
oa_version: Submitted Version
publisher: Zenodo
related_material:
record:
- id: '20927'
relation: used_in_publication
status: public
status: public
title: Mode dispersion with magnetic field in a cavity-magnonics system
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: research_data_reference
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
year: '2025'
...
---
OA_place: repository
OA_type: green
_id: '20976'
abstract:
- lang: eng
text: We present an experimental demonstration of an impedance-engineered Josephson
parametric amplifier (IEJPA) fabricated in a single-step lithography process.
Impedance-engineering is implemented using a lumped-element series LC circuit.
We use a simpler lithography process where the entire device—impedance transformer
and Josephson parametric amplifier (JPA)—is patterned in a single electron beam
lithography step, followed by a double-angle Dolan-bridge technique for Al–AlOx–Al
deposition. We observe amplification with 18 dB gain over a wide 400 MHz bandwidth
centered around 5.3 GHz with added noise approaching the quantum limit, and a
saturation power of −114 dBm. To accurately explain our experimental results,
we extend existing theories for IEJPAs to incorporate the full sine nonlinearity
of both the JPA and the transformer. Our work provides a route to simpler realization
of broadband JPAs and a theoretical foundation for a regime of JPA operation that
has been less explored in literature.
acknowledgement: The authors acknowledge receiving support from the Space Technology
Cell at IISc and ISRO through the project STC-0444(2022) and the Ministry of Electronics
and Information Technology of the Government of India, under the centre of Excellence
of Quantum Technology at the Indian Institute of Science, as well as the office
of Principle Scientific Advisor, Government of India. S.H. and A.P. acknowledge
the support of the Kishore Vaigyanik Protsahan Yojana (KVPY). A.S. acknowledges
the support of a New Faculty Initiation Grant (NFIG) from IIT Madras.
article_number: '254001'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Lipi
full_name: Patel, Lipi
last_name: Patel
- first_name: Samarth
full_name: Hawaldar, Samarth
id: 221708e1-1ff6-11ee-9fa6-85146607433e
last_name: Hawaldar
orcid: 0000-0002-1965-4309
- first_name: Aditya
full_name: Panikkar, Aditya
last_name: Panikkar
- first_name: Athreya
full_name: Shankar, Athreya
last_name: Shankar
- first_name: Baladitya
full_name: Suri, Baladitya
last_name: Suri
citation:
ama: Patel L, Hawaldar S, Panikkar A, Shankar A, Suri B. Impedance-engineered Josephson
parametric amplifier with single-step lithography. Applied Physics Letters.
2025;127(25). doi:10.1063/5.0290636
apa: Patel, L., Hawaldar, S., Panikkar, A., Shankar, A., & Suri, B. (2025).
Impedance-engineered Josephson parametric amplifier with single-step lithography.
Applied Physics Letters. AIP Publishing. https://doi.org/10.1063/5.0290636
chicago: Patel, Lipi, Samarth Hawaldar, Aditya Panikkar, Athreya Shankar, and Baladitya
Suri. “Impedance-Engineered Josephson Parametric Amplifier with Single-Step Lithography.”
Applied Physics Letters. AIP Publishing, 2025. https://doi.org/10.1063/5.0290636.
ieee: L. Patel, S. Hawaldar, A. Panikkar, A. Shankar, and B. Suri, “Impedance-engineered
Josephson parametric amplifier with single-step lithography,” Applied Physics
Letters, vol. 127, no. 25. AIP Publishing, 2025.
ista: Patel L, Hawaldar S, Panikkar A, Shankar A, Suri B. 2025. Impedance-engineered
Josephson parametric amplifier with single-step lithography. Applied Physics Letters.
127(25), 254001.
mla: Patel, Lipi, et al. “Impedance-Engineered Josephson Parametric Amplifier with
Single-Step Lithography.” Applied Physics Letters, vol. 127, no. 25, 254001,
AIP Publishing, 2025, doi:10.1063/5.0290636.
short: L. Patel, S. Hawaldar, A. Panikkar, A. Shankar, B. Suri, Applied Physics
Letters 127 (2025).
date_created: 2026-01-11T23:01:34Z
date_published: 2025-12-22T00:00:00Z
date_updated: 2026-01-12T09:57:53Z
day: '22'
department:
- _id: JoFi
doi: 10.1063/5.0290636
external_id:
arxiv:
- '2507.09298'
intvolume: ' 127'
issue: '25'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.48550/arXiv.2507.09298
month: '12'
oa: 1
oa_version: Preprint
publication: Applied Physics Letters
publication_identifier:
eissn:
- 1077-3118
issn:
- 0003-6951
publication_status: published
publisher: AIP Publishing
quality_controlled: '1'
scopus_import: '1'
status: public
title: Impedance-engineered Josephson parametric amplifier with single-step lithography
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 127
year: '2025'
...
---
OA_place: repository
OA_type: green
_id: '21318'
abstract:
- lang: eng
text: Matter waves have been observed in double-slit experiments with microscopic
objects, such as atoms or molecules. The wave function describing the motion of
these objects must extend over a distance comparable to the slit separation, much
larger than the characteristic size of the objects. Preparing such states for
more massive objects, such as mechanical oscillators, remains an outstanding challenge.
Here we delocalize the quantum ground state of an optically levitated nanosphere
by modulating the stiffness of the confining potential. We show a more than threefold
increase of the initial coherence length, which corresponds to mechanical momentum
squeezing of more than 7 dB. Our work is a stepping stone toward the generation
of coherence lengths comparable to the object size, a crucial regime for macroscopic
quantum experiments.
article_number: '083601'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: M.
full_name: Rossi, M.
last_name: Rossi
- first_name: Andrei
full_name: Militaru, Andrei
id: d67706f8-8eb1-11ee-ad1b-9c30dfa19e0b
last_name: Militaru
- first_name: N.
full_name: Carlon Zambon, N.
last_name: Carlon Zambon
- first_name: A.
full_name: Riera-Campeny, A.
last_name: Riera-Campeny
- first_name: O.
full_name: Romero-Isart, O.
last_name: Romero-Isart
- first_name: M.
full_name: Frimmer, M.
last_name: Frimmer
- first_name: L.
full_name: Novotny, L.
last_name: Novotny
citation:
ama: Rossi M, Militaru A, Carlon Zambon N, et al. Quantum delocalization of a levitated
nanoparticle. Physical Review Letters. 2025;135(8). doi:10.1103/2yzc-fsm3
apa: Rossi, M., Militaru, A., Carlon Zambon, N., Riera-Campeny, A., Romero-Isart,
O., Frimmer, M., & Novotny, L. (2025). Quantum delocalization of a levitated
nanoparticle. Physical Review Letters. American Physical Society. https://doi.org/10.1103/2yzc-fsm3
chicago: Rossi, M., Andrei Militaru, N. Carlon Zambon, A. Riera-Campeny, O. Romero-Isart,
M. Frimmer, and L. Novotny. “Quantum Delocalization of a Levitated Nanoparticle.”
Physical Review Letters. American Physical Society, 2025. https://doi.org/10.1103/2yzc-fsm3.
ieee: M. Rossi et al., “Quantum delocalization of a levitated nanoparticle,”
Physical Review Letters, vol. 135, no. 8. American Physical Society, 2025.
ista: Rossi M, Militaru A, Carlon Zambon N, Riera-Campeny A, Romero-Isart O, Frimmer
M, Novotny L. 2025. Quantum delocalization of a levitated nanoparticle. Physical
Review Letters. 135(8), 083601.
mla: Rossi, M., et al. “Quantum Delocalization of a Levitated Nanoparticle.” Physical
Review Letters, vol. 135, no. 8, 083601, American Physical Society, 2025,
doi:10.1103/2yzc-fsm3.
short: M. Rossi, A. Militaru, N. Carlon Zambon, A. Riera-Campeny, O. Romero-Isart,
M. Frimmer, L. Novotny, Physical Review Letters 135 (2025).
date_created: 2026-02-18T10:19:30Z
date_published: 2025-08-19T00:00:00Z
date_updated: 2026-02-24T07:03:57Z
day: '19'
department:
- _id: JoFi
doi: 10.1103/2yzc-fsm3
external_id:
arxiv:
- '2408.01264'
pmid:
- '40929305'
intvolume: ' 135'
issue: '8'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.48550/arXiv.2408.01264
month: '08'
oa: 1
oa_version: Preprint
pmid: 1
publication: Physical Review Letters
publication_identifier:
eissn:
- 1079-7114
issn:
- 0031-9007
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
status: public
title: Quantum delocalization of a levitated nanoparticle
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 135
year: '2025'
...
---
OA_place: publisher
OA_type: hybrid
_id: '19073'
abstract:
- lang: eng
text: The rapid development of superconducting quantum hardware is expected to run
into substantial restrictions on scalability because error correction in a cryogenic
environment has stringent input–output requirements. Classical data centres rely
on fibre-optic interconnects to remove similar networking bottlenecks. In the
same spirit, ultracold electro-optic links have been proposed and used to generate
qubit control signals, or to replace cryogenic readout electronics. So far, these
approaches have suffered from either low efficiency, low bandwidth or additional
noise. Here we realize radio-over-fibre qubit readout at millikelvin temperatures.
We use one device to simultaneously perform upconversion and downconversion between
microwave and optical frequencies and so do not require any active or passive
cryogenic microwave equipment. We demonstrate all-optical single-shot readout
in a circulator-free readout scheme. Importantly, we do not observe any direct
radiation impact on the qubit state, despite the absence of shielding elements.
This compatibility between superconducting circuits and telecom-wavelength light
is not only a prerequisite to establish modular quantum networks, but it is also
relevant for multiplexed readout of superconducting photon detectors and classical
superconducting logic.
acknowledgement: We thank F. Hassani and M. Zemlicka for assistance with qubit design
and high-power readout, respectively, and P. Winkel and I. Pop at Karlsruhe Institute
of Technology for providing the JPA. This work was supported by the European Research
Council under grant nos. 758053 (ERC StG QUNNECT) and 101089099 (ERC CoG cQEO),
and the European Union’s Horizon 2020 research and innovation program under grant
no. 899354 (FETopen SuperQuLAN). This research was funded in whole, or in part,
by the Austrian Science Fund (FWF) DOI 10.55776/F71. L.Q. acknowledges generous
support from the ISTFELLOW programme and G.A. is the recipient of a DOC fellowship
of the Austrian Academy of Sciences at IST Austria. Open access funding provided
by Institute of Science and Technology (IST Austria).
article_number: '9470'
article_processing_charge: Yes (via OA deal)
article_type: original
author:
- first_name: Georg M
full_name: Arnold, Georg M
id: 3770C838-F248-11E8-B48F-1D18A9856A87
last_name: Arnold
orcid: 0000-0003-1397-7876
- first_name: Thomas
full_name: Werner, Thomas
id: 1fcd8497-dba3-11ea-a45e-c6fbd715f7c7
last_name: Werner
orcid: 0009-0001-2346-5236
- first_name: Rishabh
full_name: Sahu, Rishabh
id: 47D26E34-F248-11E8-B48F-1D18A9856A87
last_name: Sahu
orcid: 0000-0001-6264-2162
- first_name: Lucky
full_name: Kapoor, Lucky
id: 84b9700b-15b2-11ec-abd3-831089e67615
last_name: Kapoor
orcid: 0000-0001-8319-2148
- first_name: Liu
full_name: Qiu, Liu
id: 45e99c0d-1eb1-11eb-9b96-ed8ab2983cac
last_name: Qiu
orcid: 0000-0003-4345-4267
- first_name: Johannes M
full_name: Fink, Johannes M
id: 4B591CBA-F248-11E8-B48F-1D18A9856A87
last_name: Fink
orcid: 0000-0001-8112-028X
citation:
ama: Arnold GM, Werner T, Sahu R, Kapoor L, Qiu L, Fink JM. All-optical superconducting
qubit readout. Nature Physics. 2025;21. doi:10.1038/s41567-024-02741-4
apa: Arnold, G. M., Werner, T., Sahu, R., Kapoor, L., Qiu, L., & Fink, J. M.
(2025). All-optical superconducting qubit readout. Nature Physics. Springer
Nature. https://doi.org/10.1038/s41567-024-02741-4
chicago: Arnold, Georg M, Thomas Werner, Rishabh Sahu, Lucky Kapoor, Liu Qiu, and
Johannes M Fink. “All-Optical Superconducting Qubit Readout.” Nature Physics.
Springer Nature, 2025. https://doi.org/10.1038/s41567-024-02741-4.
ieee: G. M. Arnold, T. Werner, R. Sahu, L. Kapoor, L. Qiu, and J. M. Fink, “All-optical
superconducting qubit readout,” Nature Physics, vol. 21. Springer Nature,
2025.
ista: Arnold GM, Werner T, Sahu R, Kapoor L, Qiu L, Fink JM. 2025. All-optical superconducting
qubit readout. Nature Physics. 21, 9470.
mla: Arnold, Georg M., et al. “All-Optical Superconducting Qubit Readout.” Nature
Physics, vol. 21, 9470, Springer Nature, 2025, doi:10.1038/s41567-024-02741-4.
short: G.M. Arnold, T. Werner, R. Sahu, L. Kapoor, L. Qiu, J.M. Fink, Nature Physics
21 (2025).
corr_author: '1'
date_created: 2025-02-23T23:01:57Z
date_published: 2025-03-01T00:00:00Z
date_updated: 2026-04-15T06:40:53Z
day: '01'
ddc:
- '530'
department:
- _id: JoFi
doi: 10.1038/s41567-024-02741-4
ec_funded: 1
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month: '03'
oa: 1
oa_version: Published Version
pmid: 1
project:
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call_identifier: H2020
grant_number: '758053'
name: A Fiber Optic Transceiver for Superconducting Qubits
- _id: bdadfa0d-d553-11ed-ba76-fb85edbd456a
grant_number: '101089099'
name: 'Cavity Quantum Electro Optics: Microwave photonics with nonclassical states'
- _id: 9B868D20-BA93-11EA-9121-9846C619BF3A
call_identifier: H2020
grant_number: '899354'
name: Quantum Local Area Networks with Superconducting Qubits
- _id: 2671EB66-B435-11E9-9278-68D0E5697425
name: Coherent on-chip conversion of superconducting qubit signals from microwaves
to optical frequencies
- _id: bdb108fd-d553-11ed-ba76-83dc74a9864f
grant_number: F07105
name: QUANTUM INFORMATION SYSTEMS BEYOND CLASSICAL CAPABILITIES / P5- Integration
of Superconducting Quantum Circuits
publication: Nature Physics
publication_identifier:
eissn:
- 1745-2481
issn:
- 1745-2473
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
related_material:
link:
- description: News on ISTA Website
relation: press_release
url: https://ista.ac.at/en/news/when-qubits-learn-the-language-of-fiberoptics/
record:
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relation: earlier_version
status: public
scopus_import: '1'
status: public
title: All-optical superconducting qubit readout
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 21
year: '2025'
...
---
OA_place: publisher
_id: '20371'
abstract:
- lang: eng
text: "Quantum mechanics reveals a world that defies classical determinism, where
uncertainty, superposition, and fluctuations are fundamental aspects. Engineering
devices that harness these quantum features requires not only precision, but also
a deep understanding of how they interact with their surrounding environment.
Superconducting circuits, which exploit\r\nmacroscopic quantum coherence in low-loss
superconducting materials, provide a scalable platform for implementing such systems.
Among the critical elements in these circuits, superinductors—high-impedance,
dissipation-free inductive components—play a central role by suppressing charge
fluctuations. They allow quantum states to be delocalized in phase space, protect
qubits from environmental noise, and facilitate access to phenomena such as dual
Josephson physics and ultra-strong coupling regimes. \r\nThis thesis explores
two complementary implementations of high-impedance circuits: geometric superinductors,
demonstrating that high impedance can be achieved beyond kinetic inductance,\r\nand
Josephson junction chains, used to investigate both microwave mode properties
and DC transport across the superconductor-to-insulator transition. \r\nPart I
addresses geometric superinductors. Contrary to the common belief that high-impedance
superconducting circuits require kinetic inductance, we demonstrate that purely
geometric designs can achieve characteristic impedance exceeding the resistance
quantum. By exploiting mutual coupling between adjacent turns, coil-based inductors
achieve enhanced self-inductance, creating a reliable platform for qubits and
resonators. Modeling, simulation, fabrication, and\r\ncharacterization confirm
that these elements behave as superinductor. With low loss, high linearity, and
minimal stray capacitance, these elements are reproducible, free of uncontrolled
tunneling events, and capable of strong magnetic coupling. This establishes geometric
superinductors as robust, single-wave-function superconducting devices suitable
for hardware protected qubits and hybrid systems.\r\nPart II presents classical
numerical simulations of a Quantum Phase Slip circuit to study dual Shapiro steps.
The circuit consists of an ideal Quantum Phase Slip element embedded in a resistive-inductive
environment with a parasitic capacitance.\r\nPart III extends the investigation
of high characteristic-impedance circuit elements to one-dimensional Josephson
junction chains, which act as a quantum simulator for many-body physics and the
superconductor–insulator transition. Different devices are realized on both sides
of the DC phase transition, showing either a supercurrent branch or Coulomb blockade
at zero bias. The effect of the crossover on microwave modes, however, remains
insufficiently investigated. Studying these modes provides insight into the interplay
between disorder and phase-slip events. Small differences in circuit component
sizes determine which side of the transition a device falls on, making these results
relevant not only for fundamental understanding but also for the design of quantum
devices, emphasizing the crucial role of the\r\nelectromagnetic environment in
stabilizing and controlling fragile quantum states. \r\nTogether, these results
illustrate how carefully engineered high characteristic-impedance elements provide
a link between macroscopic circuits and the inherently uncertain quantum world,
enabling experiments that probe, control, and ultimately exploit quantum fluctuations
for applications in quantum information, metrology, solid state physics and beyond.\r\n\r\n"
acknowledged_ssus:
- _id: NanoFab
- _id: M-Shop
acknowledgement: "I also gratefully acknowledge the generous support of the NOMIS
Foundation Project \"Protected\r\nStates of Quantum Matter\" and the grant from
the Beyond-C consortium. Their funding\r\nmade this research possible and gave me
the freedom to ask ambitious questions, and try to\r\nanswer them.\r\n"
alternative_title:
- ISTA Thesis
article_processing_charge: No
author:
- first_name: Andrea
full_name: Trioni, Andrea
id: 42F71B44-F248-11E8-B48F-1D18A9856A87
last_name: Trioni
citation:
ama: 'Trioni A. High-impedance quantum circuits for mesoscopic physics : Geometric
superinductors and insulating Josephson Chains. 2025. doi:10.15479/AT-ISTA-20371'
apa: 'Trioni, A. (2025). High-impedance quantum circuits for mesoscopic physics :
Geometric superinductors and insulating Josephson Chains. Institute of Science
and Technology Austria. https://doi.org/10.15479/AT-ISTA-20371'
chicago: 'Trioni, Andrea. “High-Impedance Quantum Circuits for Mesoscopic Physics :
Geometric Superinductors and Insulating Josephson Chains.” Institute of Science
and Technology Austria, 2025. https://doi.org/10.15479/AT-ISTA-20371.'
ieee: 'A. Trioni, “High-impedance quantum circuits for mesoscopic physics : Geometric
superinductors and insulating Josephson Chains,” Institute of Science and Technology
Austria, 2025.'
ista: 'Trioni A. 2025. High-impedance quantum circuits for mesoscopic physics :
Geometric superinductors and insulating Josephson Chains. Institute of Science
and Technology Austria.'
mla: 'Trioni, Andrea. High-Impedance Quantum Circuits for Mesoscopic Physics :
Geometric Superinductors and Insulating Josephson Chains. Institute of Science
and Technology Austria, 2025, doi:10.15479/AT-ISTA-20371.'
short: 'A. Trioni, High-Impedance Quantum Circuits for Mesoscopic Physics : Geometric
Superinductors and Insulating Josephson Chains, Institute of Science and Technology
Austria, 2025.'
corr_author: '1'
date_created: 2025-09-23T09:57:57Z
date_published: 2025-09-23T00:00:00Z
date_updated: 2026-04-15T06:43:02Z
day: '23'
ddc:
- '539'
degree_awarded: PhD
department:
- _id: GradSch
- _id: JoFi
doi: 10.15479/AT-ISTA-20371
ec_funded: 1
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checksum: 6fb925648dfa5f4384814c552ee2f099
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month: '09'
oa: 1
oa_version: Published Version
page: '202'
project:
- _id: eb9b30ac-77a9-11ec-83b8-871f581d53d2
name: Protected states of quantum matter
- _id: bdb108fd-d553-11ed-ba76-83dc74a9864f
grant_number: F07105
name: QUANTUM INFORMATION SYSTEMS BEYOND CLASSICAL CAPABILITIES / P5- Integration
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- _id: 2564DBCA-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '665385'
name: International IST Doctoral Program
publication_identifier:
isbn:
- 978-3-99078-067-1
issn:
- 2663-337X
publication_status: published
publisher: Institute of Science and Technology Austria
related_material:
record:
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relation: part_of_dissertation
status: public
status: public
supervisor:
- first_name: Johannes M
full_name: Fink, Johannes M
id: 4B591CBA-F248-11E8-B48F-1D18A9856A87
last_name: Fink
orcid: 0000-0001-8112-028X
title: 'High-impedance quantum circuits for mesoscopic physics : Geometric superinductors
and insulating Josephson Chains'
type: dissertation
user_id: ba8df636-2132-11f1-aed0-ed93e2281fdd
year: '2025'
...
---
OA_place: publisher
_id: '18871'
abstract:
- lang: eng
text: "\"Can we do this with a new type of computer - a quantum computer?\". This
famous\r\nquotation of the brilliant Richard Feynman within a conference talk
on \"Simulating physics\r\nwith computers.” is often reverently praised as the
origin of the field of quantum computing.\r\nThe idea was to use quantum mechanical
systems itself to simulate \"Nature\", which is\r\ninherently quantum mechanical.
Now, 43 years later, the theoretical framework of how such\r\na computer can operate
has been developed. Two main important concepts for a potential\r\nquantum supremacy,
superposition and entanglement, have been exploited to design quantum\r\nalgorithms
to significantly speed up certain tasks. Yet, the specific hardware implementation\r\nis
still far from being certain, in fact the race between the most promising platforms
such as\r\nsuperconducting qubits, bosonic codes, cold atoms, trapped ions, optical
computing as well\r\nas spin qubits has recently intensified. If one also includes
the most mature applications of\r\nquantum communication technologies, secure
quantum key distribution and quantum random\r\nnumber generators, as part of a
quantum information technology ecosystem, we are confronted\r\nwith a plethora
of different materials, concepts, and also operation frequencies. While\r\nsuperconducting
qubits, bosonic codes and spin qubits work in the regime of approximately 5\r\nGHz
and are controlled by electrical fields, trapped ions, cold atoms, and optical
quantum\r\ncomputing operate with light in the infrared or visible range.\r\nConsequently,
a quantum frequency converter or microwave-optic transducer is required\r\nto
interface the different frequency domains or establish a long-range network connection\r\nwith
suitable telecom fibers. In fact, the combination of different frequency regimes
is also\r\nan essential part in our classical modern communication network, where
computations are\r\nperformed in electrical circuits and the information exchange
over longer distances happens\r\nvia optical fibers. However, the specific challenges
specific to building a quantum computer,\r\nalso apply to the development of such
a quantum frequency transducer: 1) As we deal with\r\nsingle excitations as the
carrier of information, i.e. the smallest possible quantity, the signal\r\ncan
easily be corrupted by other noise sources which needs to be avoided by all means.
This\r\nis also the reason why microwave quantum computers operate at temperature
environments\r\nclose to zero temperature (< 0.1 Kelvin) to avoid corruption by
thermal noise. 2) The\r\nfrequency interface generally needs to preserve the phase
of the signal as an essential part\r\nof the quantum state. And 3) Quantum signals
cannot be copied which would be a typical\r\nstrategy to account for errors in
classical computers. And finally, there is a challenge specific to\r\nmicrowave-optic
transducers: While quantum computers are operating in one specific frequency\r\ndomain,
microwave-optic transducers combine microwave and optical fields in one device.\r\nThis
results in the particular challenge that high-energy optical radiation, which
is usually\r\nwell-shielded from superconducting microwave quantum processors,
are now an essential part\r\nof the device. The concomitant optical radiation
in the operating transducer will inevitably\r\nhave a detrimental effect on the
superconducting microwave components. Together with the\r\nrequirement of minimal
background noise for quantum-limited operation as described above,\r\nv\r\nheating
from the absorption of optical photons within the same device where single microwave\r\nexcitations
are processed forms a formidable challenge.\r\nThis thesis aims to address this
challenge by developing microwave-optic transducers where\r\nthe impact of optical
absorption on superconducting circuits in general and superconducting\r\nqubits
specifically can be mitigated. In our first approach, we developed a compact device\r\nwith
optimized interaction strengths between the different frequency domains. This
minimizes\r\nthe optical powers used for transducer operation and thus the optical
absorption heating. This\r\nwork was - to the best of our knowledge - the first
comprehensive noise study, in an integrated\r\nmicrowave-optic transducer. Unfortunately,
we saw that the optical absorption heating added\r\nnoise way above a single excitation.
Consequently, a potential quantum signal would have\r\nbeen buried in the noise,
added by the transduction.\r\nBuilding on this insight, we utilized a three-dimensional
microwave-optic transducer instead\r\nof an integrated device. The larger heat
capacity of the macroscopic device with a size\r\nof a few millimeters can absorb
a larger fraction of the optical heating before it increases\r\nthe temperature
of the device. This allowed us to interface the transducer directly with a\r\nsuperconducting
qubit to readout the qubit state in a novel all-optical manner. We showed\r\nthat
the microwave-optic transducer can be operated in a regime in which optical fields
don’t\r\nharm the sensitive qubit. This is an important prerequisite for the operation
of microwave-optic\r\ntransducers in conjunction with microwave quantum processors
and brings the integration and\r\nseamless orchestration of different frequency
components in a quantum network a step closer.\r\n"
acknowledged_ssus:
- _id: SSU
- _id: M-Shop
- _id: NanoFab
acknowledgement: "This work was supported by the European Research Council under grant
agreement no. 758053\r\n(ERC StG QUNNECT) and the European Union’s Horizon 2020
research, innovation program\r\nunder grant agreement no. 899354 (FETopen SuperQuLAN)
and the Austrian Science Fund\r\n(FWF) through BeyondC (F7105). I want to acknowledge
generous support from the Austrian\r\nAcademy of Sciences from a DOC [Doctoral program
of the Austrian Academy of Sciences]\r\nfellowship (no. 25129).\r\n"
alternative_title:
- ISTA Thesis
article_processing_charge: No
author:
- first_name: Georg M
full_name: Arnold, Georg M
id: 3770C838-F248-11E8-B48F-1D18A9856A87
last_name: Arnold
orcid: 0000-0003-1397-7876
citation:
ama: Arnold GM. Microwave-optic interconnects for superconducting circuits. 2025.
doi:10.15479/at:ista:18871
apa: Arnold, G. M. (2025). Microwave-optic interconnects for superconducting
circuits. Institute of Science and Technology Austria. https://doi.org/10.15479/at:ista:18871
chicago: Arnold, Georg M. “Microwave-Optic Interconnects for Superconducting Circuits.”
Institute of Science and Technology Austria, 2025. https://doi.org/10.15479/at:ista:18871.
ieee: G. M. Arnold, “Microwave-optic interconnects for superconducting circuits,”
Institute of Science and Technology Austria, 2025.
ista: Arnold GM. 2025. Microwave-optic interconnects for superconducting circuits.
Institute of Science and Technology Austria.
mla: Arnold, Georg M. Microwave-Optic Interconnects for Superconducting Circuits.
Institute of Science and Technology Austria, 2025, doi:10.15479/at:ista:18871.
short: G.M. Arnold, Microwave-Optic Interconnects for Superconducting Circuits,
Institute of Science and Technology Austria, 2025.
corr_author: '1'
date_created: 2025-01-24T10:28:39Z
date_published: 2025-01-24T00:00:00Z
date_updated: 2026-04-16T12:20:43Z
day: '24'
ddc:
- '530'
degree_awarded: PhD
department:
- _id: JoFi
- _id: GradSch
doi: 10.15479/at:ista:18871
ec_funded: 1
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project:
- _id: 26336814-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '758053'
name: A Fiber Optic Transceiver for Superconducting Qubits
- _id: 9B868D20-BA93-11EA-9121-9846C619BF3A
call_identifier: H2020
grant_number: '899354'
name: Quantum Local Area Networks with Superconducting Qubits
- _id: 2671EB66-B435-11E9-9278-68D0E5697425
name: Coherent on-chip conversion of superconducting qubit signals from microwaves
to optical frequencies
- _id: bdb108fd-d553-11ed-ba76-83dc74a9864f
grant_number: F07105
name: QUANTUM INFORMATION SYSTEMS BEYOND CLASSICAL CAPABILITIES / P5- Integration
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publication_identifier:
issn:
- 2663-337X
publication_status: published
publisher: Institute of Science and Technology Austria
related_material:
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- id: '6609'
relation: part_of_dissertation
status: public
- id: '8529'
relation: part_of_dissertation
status: public
- id: '18953'
relation: part_of_dissertation
status: public
- id: '10924'
relation: part_of_dissertation
status: public
- id: '9114'
relation: part_of_dissertation
status: public
- id: '13200'
relation: part_of_dissertation
status: public
status: public
supervisor:
- first_name: Johannes M
full_name: Fink, Johannes M
id: 4B591CBA-F248-11E8-B48F-1D18A9856A87
last_name: Fink
orcid: 0000-0001-8112-028X
title: Microwave-optic interconnects for superconducting circuits
tmp:
image: /images/cc_by_nc_sa.png
legal_code_url: https://creativecommons.org/licenses/by-nc-sa/4.0/legalcode
name: Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC
BY-NC-SA 4.0)
short: CC BY-NC-SA (4.0)
type: dissertation
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
year: '2025'
...
---
OA_place: publisher
_id: '19533'
abstract:
- lang: eng
text: "This thesis explores advancements in quantum remote sensing and non-equilibrium
phase\r\ntransitions in the microwave regime, with a focus on dissipative phase
transitions and quantumenhanced sensing.\r\nIn the first project, I experimentally
studied photon blockade breakdown as a dissipative phase\r\ntransition in a zero-dimensional
cavity-qubit system. By defining an appropriate thermodynamic\r\nlimit, we demonstrated
that the observed bistability is a genuine signature of a first-order\r\nphase
transition in this system. This work provides insight into non-equilibrium quantum\r\ndynamics
and phase transitions in driven-dissipative open quantum systems.\r\nThe second
project focuses on the experimental realization of a phase-conjugate receiver
for\r\nquantum illumination (QI), a quantum sensing protocol that enhances target
detection in noisy\r\nenvironments using entangled light. While an ideal spontaneous
parametric down-conversion\r\n(SPDC) source and receiver could, in theory, provide
up to a 6 dB advantage over classical\r\nillumination, no such ideal receiver
exists. Instead, we explore an experimental realization of a\r\nphase-conjugate
receiver for QI in the microwave regime at millikelvin temperatures using a\r\nJosephson
parametric converter (JPC) as a source of continuous-variable Gaussian entangled\r\nsignal-idler
pairs, where a maximum 3 dB advantage is theoretically achievable. We investigate\r\nkey
experimental limitations that constrain practical QI performance, contributing
to the\r\ndevelopment of quantum-enhanced sensing.\r\nAdditionally, this thesis
presents efficient digital signal processing (DSP) techniques implemented in C++
and Python in collaboration with Przemysław Zieliński and Luka Drmić. These\r\nmethods,
optimized using the Intel Integrated Performance Primitives (IPP) library, have
been\r\nessential in data acquisition, noise filtering, and correlation analysis
across multiple research\r\nprojects. Although not real-time, these DSP techniques
significantly enhance the accuracy of\r\nquantum measurements.\r\nOverall, this
thesis advances quantum-enhanced sensing by establishing the thermodynamic\r\nlimit
in a single transmon-cavity system and experimentally exploring a phase-conjugate
receiver\r\nfor QI. These findings contribute to quantum metrology, particularly
for weak signal detection\r\nand remote sensing in noisy environments.\r\n"
acknowledged_ssus:
- _id: ScienComp
- _id: M-Shop
- _id: NanoFab
- _id: LifeSc
- _id: SSU
acknowledgement: "I acknowledge the generous financial support of the Austrian Science
Fund (FWF) via BeyondC\r\n(F7105) and the European Union’s Horizon 2020 research
and innovation program (FETopen\r\nQUARTET, Grant Agreement No. 862644), which made
this research possible. I also extend\r\nmy sincere appreciation to the MIBA workshop
and the Institute of Science and Technology\r\nAustria nanofabrication facility
for their technical assistance, which was instrumental in realizing\r\nthis work."
alternative_title:
- ISTA Thesis
article_processing_charge: No
author:
- first_name: Riya
full_name: Sett, Riya
id: 2E6D040E-F248-11E8-B48F-1D18A9856A87
last_name: Sett
orcid: 0000-0001-7641-8348
citation:
ama: Sett R. Quantum remote sensing and non-equilibrium phase transitions in the
microwave regime. 2025. doi:10.15479/AT-ISTA-19533
apa: Sett, R. (2025). Quantum remote sensing and non-equilibrium phase transitions
in the microwave regime. Institute of Science and Technology Austria. https://doi.org/10.15479/AT-ISTA-19533
chicago: Sett, Riya. “ Quantum Remote Sensing and Non-Equilibrium Phase Transitions
in the Microwave Regime.” Institute of Science and Technology Austria, 2025. https://doi.org/10.15479/AT-ISTA-19533.
ieee: R. Sett, “ Quantum remote sensing and non-equilibrium phase transitions in
the microwave regime,” Institute of Science and Technology Austria, 2025.
ista: Sett R. 2025. Quantum remote sensing and non-equilibrium phase transitions
in the microwave regime. Institute of Science and Technology Austria.
mla: Sett, Riya. Quantum Remote Sensing and Non-Equilibrium Phase Transitions
in the Microwave Regime. Institute of Science and Technology Austria, 2025,
doi:10.15479/AT-ISTA-19533.
short: R. Sett, Quantum Remote Sensing and Non-Equilibrium Phase Transitions in
the Microwave Regime, Institute of Science and Technology Austria, 2025.
corr_author: '1'
date_created: 2025-04-09T16:44:26Z
date_published: 2025-04-01T00:00:00Z
date_updated: 2026-04-16T12:20:42Z
day: '1'
ddc:
- '530'
degree_awarded: PhD
department:
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doi: 10.15479/AT-ISTA-19533
ec_funded: 1
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creator: rsett
date_created: 2025-04-10T11:33:22Z
date_updated: 2025-10-11T22:30:02Z
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file_id: '19539'
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file_date_updated: 2025-10-11T22:30:02Z
has_accepted_license: '1'
keyword:
- phase transition
- open quantum system
- phase diagram
- cavity quantum electrodynamics
- superconducting qubits
- semiclassical physics
- quantum optics
- josephson junction
- parametric converter
- phase conjugation
- quantum radar
- quantum entanglement
- correlation
- quantum sensing
language:
- iso: eng
month: '04'
oa: 1
oa_version: Published Version
page: '109'
project:
- _id: 237CBA6C-32DE-11EA-91FC-C7463DDC885E
call_identifier: H2020
grant_number: '862644'
name: Quantum readout techniques and technologies
- _id: bdb108fd-d553-11ed-ba76-83dc74a9864f
grant_number: F07105
name: QUANTUM INFORMATION SYSTEMS BEYOND CLASSICAL CAPABILITIES / P5- Integration
of Superconducting Quantum Circuits
publication_identifier:
issn:
- 2663-337X
publication_status: published
publisher: Institute of Science and Technology Austria
related_material:
record:
- id: '18978'
relation: research_data
status: public
- id: '19280'
relation: part_of_dissertation
status: public
- id: '13117'
relation: part_of_dissertation
status: public
- id: '17183'
relation: part_of_dissertation
status: public
status: public
supervisor:
- first_name: Johannes M
full_name: Fink, Johannes M
id: 4B591CBA-F248-11E8-B48F-1D18A9856A87
last_name: Fink
orcid: 0000-0001-8112-028X
title: ' Quantum remote sensing and non-equilibrium phase transitions in the microwave
regime'
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: dissertation
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
year: '2025'
...
---
OA_place: publisher
OA_type: hybrid
_id: '19280'
abstract:
- lang: eng
text: Recent advancements in superconducting circuits have enabled the experimental
study of collective behavior of precisely controlled intermediate-scale ensembles
of qubits. In this work, we demonstrate an atomic frequency comb formed by individual
artificial atoms strongly coupled to a single resonator mode. We observe periodic
microwave pulses that originate from a single coherent excitation dynamically
interacting with the multiqubit ensemble. We show that this revival dynamics emerges
as a consequence of the constructive and periodic rephasing of the five superconducting
qubits forming the vacuum Rabi split comb. In the future, similar devices could
be used as a memory with in situ tunable storage time or as an on-chip periodic
pulse generator with nonclassical photon statistics.
acknowledged_ssus:
- _id: M-Shop
- _id: NanoFab
acknowledgement: 'The authors thank G. Arnold and R. Sahu for the discussions, L.
Drmic for software development, the MIBA workshop and the ISTA nanofabrication facility
for technical support, and VTT Technical Research Centre of Finland for providing
us TWPAs for follow-up measurements. This work was supported by the Austrian Science
Fund (FWF) [Grant DOI: 10.55776/F71] through BeyondC (F7105) and IST Austria. E. S. R.
is the recipient of a DOC fellowship of the Austrian Academy of Sciences at IST
Austria. J. M. F. and M. Ž. acknowledge support from the European Research Council
under Grant Agreement No. 758053 (ERC StG QUNNECT) and a NOMIS foundation research
grant.'
article_number: '063601'
article_processing_charge: Yes (via OA deal)
article_type: original
arxiv: 1
author:
- first_name: Elena
full_name: Redchenko, Elena
id: 2C21D6E8-F248-11E8-B48F-1D18A9856A87
last_name: Redchenko
- first_name: M.
full_name: Zens, M.
last_name: Zens
- first_name: Martin
full_name: Zemlicka, Martin
id: 2DCF8DE6-F248-11E8-B48F-1D18A9856A87
last_name: Zemlicka
orcid: 0009-0005-0878-3032
- first_name: Matilda
full_name: Peruzzo, Matilda
id: 3F920B30-F248-11E8-B48F-1D18A9856A87
last_name: Peruzzo
orcid: 0000-0002-3415-4628
- first_name: Farid
full_name: Hassani, Farid
id: 2AED110C-F248-11E8-B48F-1D18A9856A87
last_name: Hassani
orcid: 0000-0001-6937-5773
- first_name: Riya
full_name: Sett, Riya
id: 2E6D040E-F248-11E8-B48F-1D18A9856A87
last_name: Sett
orcid: 0000-0001-7641-8348
- first_name: Przemyslaw D
full_name: Zielinski, Przemyslaw D
id: e198fcc4-f6e0-11ea-865d-b6a256760ee8
last_name: Zielinski
- first_name: H. S.
full_name: Dhar, H. S.
last_name: Dhar
- first_name: D. O.
full_name: Krimer, D. O.
last_name: Krimer
- first_name: S.
full_name: Rotter, S.
last_name: Rotter
- first_name: Johannes M
full_name: Fink, Johannes M
id: 4B591CBA-F248-11E8-B48F-1D18A9856A87
last_name: Fink
orcid: 0000-0001-8112-028X
citation:
ama: Redchenko E, Zens M, Zemlicka M, et al. Observation of collapse and revival
in a superconducting atomic frequency comb. Physical Review Letters. 2025;134(6).
doi:10.1103/PhysRevLett.134.063601
apa: Redchenko, E., Zens, M., Zemlicka, M., Peruzzo, M., Hassani, F., Sett, R.,
… Fink, J. M. (2025). Observation of collapse and revival in a superconducting
atomic frequency comb. Physical Review Letters. American Physical Society.
https://doi.org/10.1103/PhysRevLett.134.063601
chicago: Redchenko, Elena, M. Zens, Martin Zemlicka, Matilda Peruzzo, Farid Hassani,
Riya Sett, Przemyslaw D Zielinski, et al. “Observation of Collapse and Revival
in a Superconducting Atomic Frequency Comb.” Physical Review Letters. American
Physical Society, 2025. https://doi.org/10.1103/PhysRevLett.134.063601.
ieee: E. Redchenko et al., “Observation of collapse and revival in a superconducting
atomic frequency comb,” Physical Review Letters, vol. 134, no. 6. American
Physical Society, 2025.
ista: Redchenko E, Zens M, Zemlicka M, Peruzzo M, Hassani F, Sett R, Zielinski PD,
Dhar HS, Krimer DO, Rotter S, Fink JM. 2025. Observation of collapse and revival
in a superconducting atomic frequency comb. Physical Review Letters. 134(6), 063601.
mla: Redchenko, Elena, et al. “Observation of Collapse and Revival in a Superconducting
Atomic Frequency Comb.” Physical Review Letters, vol. 134, no. 6, 063601,
American Physical Society, 2025, doi:10.1103/PhysRevLett.134.063601.
short: E. Redchenko, M. Zens, M. Zemlicka, M. Peruzzo, F. Hassani, R. Sett, P.D.
Zielinski, H.S. Dhar, D.O. Krimer, S. Rotter, J.M. Fink, Physical Review Letters
134 (2025).
corr_author: '1'
date_created: 2025-03-02T23:01:52Z
date_published: 2025-02-14T00:00:00Z
date_updated: 2026-04-26T22:31:08Z
day: '14'
ddc:
- '530'
department:
- _id: JoFi
doi: 10.1103/PhysRevLett.134.063601
ec_funded: 1
external_id:
arxiv:
- '2310.04200'
isi:
- '001454696700003'
pmid:
- '40021171'
file:
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checksum: 633d6c5ddd9b805da22c5839d3d48df6
content_type: application/pdf
creator: dernst
date_created: 2025-03-04T10:40:50Z
date_updated: 2025-03-04T10:40:50Z
file_id: '19291'
file_name: 2025_PhysReviewLetters_Redchenko.pdf
file_size: 2080408
relation: main_file
success: 1
file_date_updated: 2025-03-04T10:40:50Z
has_accepted_license: '1'
intvolume: ' 134'
isi: 1
issue: '6'
language:
- iso: eng
month: '02'
oa: 1
oa_version: Published Version
pmid: 1
project:
- _id: bdb108fd-d553-11ed-ba76-83dc74a9864f
grant_number: F07105
name: QUANTUM INFORMATION SYSTEMS BEYOND CLASSICAL CAPABILITIES / P5- Integration
of Superconducting Quantum Circuits
- _id: 26336814-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '758053'
name: A Fiber Optic Transceiver for Superconducting Qubits
- _id: 26B354CA-B435-11E9-9278-68D0E5697425
name: Controllable Collective States of Superconducting Qubit Ensembles
publication: Physical Review Letters
publication_identifier:
eissn:
- 1079-7114
issn:
- 0031-9007
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
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scopus_import: '1'
status: public
title: Observation of collapse and revival in a superconducting atomic frequency comb
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 134
year: '2025'
...
---
_id: '14846'
abstract:
- lang: eng
text: Contraction and flow of the actin cell cortex have emerged as a common principle
by which cells reorganize their cytoplasm and take shape. However, how these cortical
flows interact with adjacent cytoplasmic components, changing their form and localization,
and how this affects cytoplasmic organization and cell shape remains unclear.
Here we show that in ascidian oocytes, the cooperative activities of cortical
actomyosin flows and deformation of the adjacent mitochondria-rich myoplasm drive
oocyte cytoplasmic reorganization and shape changes following fertilization. We
show that vegetal-directed cortical actomyosin flows, established upon oocyte
fertilization, lead to both the accumulation of cortical actin at the vegetal
pole of the zygote and compression and local buckling of the adjacent elastic
solid-like myoplasm layer due to friction forces generated at their interface.
Once cortical flows have ceased, the multiple myoplasm buckles resolve into one
larger buckle, which again drives the formation of the contraction pole—a protuberance
of the zygote’s vegetal pole where maternal mRNAs accumulate. Thus, our findings
reveal a mechanism where cortical actomyosin network flows determine cytoplasmic
reorganization and cell shape by deforming adjacent cytoplasmic components through
friction forces.
acknowledged_ssus:
- _id: EM-Fac
- _id: Bio
- _id: NanoFab
acknowledgement: We would like to thank A. McDougall, E. Hannezo and the Heisenberg
lab for fruitful discussions and reagents. We also thank E. Munro for the iMyo-YFP
and Bra>iMyo-mScarlet constructs. This research was supported by the Scientific
Service Units of the Institute of Science and Technology Austria through resources
provided by the Electron Microscopy Facility, Imaging and Optics Facility and the
Nanofabrication Facility. This work was supported by a Joint Project Grant from
the FWF (I 3601-B27).
article_processing_charge: Yes (in subscription journal)
article_type: original
author:
- first_name: Silvia
full_name: Caballero Mancebo, Silvia
id: 2F1E1758-F248-11E8-B48F-1D18A9856A87
last_name: Caballero Mancebo
orcid: 0000-0002-5223-3346
- first_name: Rushikesh
full_name: Shinde, Rushikesh
last_name: Shinde
- first_name: Madison
full_name: Bolger-Munro, Madison
id: 516F03FA-93A3-11EA-A7C5-D6BE3DDC885E
last_name: Bolger-Munro
orcid: 0000-0002-8176-4824
- first_name: Matilda
full_name: Peruzzo, Matilda
id: 3F920B30-F248-11E8-B48F-1D18A9856A87
last_name: Peruzzo
orcid: 0000-0002-3415-4628
- first_name: Gregory
full_name: Szep, Gregory
id: 4BFB7762-F248-11E8-B48F-1D18A9856A87
last_name: Szep
- first_name: Irene
full_name: Steccari, Irene
id: 2705C766-9FE2-11EA-B224-C6773DDC885E
last_name: Steccari
- first_name: David
full_name: Labrousse Arias, David
id: CD573DF4-9ED3-11E9-9D77-3223E6697425
last_name: Labrousse Arias
- first_name: Vanessa
full_name: Zheden, Vanessa
id: 39C5A68A-F248-11E8-B48F-1D18A9856A87
last_name: Zheden
orcid: 0000-0002-9438-4783
- first_name: Jack
full_name: Merrin, Jack
id: 4515C308-F248-11E8-B48F-1D18A9856A87
last_name: Merrin
orcid: 0000-0001-5145-4609
- first_name: Andrew
full_name: Callan-Jones, Andrew
last_name: Callan-Jones
- first_name: Raphaël
full_name: Voituriez, Raphaël
last_name: Voituriez
- first_name: Carl-Philipp J
full_name: Heisenberg, Carl-Philipp J
id: 39427864-F248-11E8-B48F-1D18A9856A87
last_name: Heisenberg
orcid: 0000-0002-0912-4566
citation:
ama: Caballero Mancebo S, Shinde R, Bolger-Munro M, et al. Friction forces determine
cytoplasmic reorganization and shape changes of ascidian oocytes upon fertilization.
Nature Physics. 2024;20:310-321. doi:10.1038/s41567-023-02302-1
apa: Caballero Mancebo, S., Shinde, R., Bolger-Munro, M., Peruzzo, M., Szep, G.,
Steccari, I., … Heisenberg, C.-P. J. (2024). Friction forces determine cytoplasmic
reorganization and shape changes of ascidian oocytes upon fertilization. Nature
Physics. Springer Nature. https://doi.org/10.1038/s41567-023-02302-1
chicago: Caballero Mancebo, Silvia, Rushikesh Shinde, Madison Bolger-Munro, Matilda
Peruzzo, Gregory Szep, Irene Steccari, David Labrousse Arias, et al. “Friction
Forces Determine Cytoplasmic Reorganization and Shape Changes of Ascidian Oocytes
upon Fertilization.” Nature Physics. Springer Nature, 2024. https://doi.org/10.1038/s41567-023-02302-1.
ieee: S. Caballero Mancebo et al., “Friction forces determine cytoplasmic
reorganization and shape changes of ascidian oocytes upon fertilization,” Nature
Physics, vol. 20. Springer Nature, pp. 310–321, 2024.
ista: Caballero Mancebo S, Shinde R, Bolger-Munro M, Peruzzo M, Szep G, Steccari
I, Labrousse Arias D, Zheden V, Merrin J, Callan-Jones A, Voituriez R, Heisenberg
C-PJ. 2024. Friction forces determine cytoplasmic reorganization and shape changes
of ascidian oocytes upon fertilization. Nature Physics. 20, 310–321.
mla: Caballero Mancebo, Silvia, et al. “Friction Forces Determine Cytoplasmic Reorganization
and Shape Changes of Ascidian Oocytes upon Fertilization.” Nature Physics,
vol. 20, Springer Nature, 2024, pp. 310–21, doi:10.1038/s41567-023-02302-1.
short: S. Caballero Mancebo, R. Shinde, M. Bolger-Munro, M. Peruzzo, G. Szep, I.
Steccari, D. Labrousse Arias, V. Zheden, J. Merrin, A. Callan-Jones, R. Voituriez,
C.-P.J. Heisenberg, Nature Physics 20 (2024) 310–321.
corr_author: '1'
date_created: 2024-01-21T23:00:57Z
date_published: 2024-02-01T00:00:00Z
date_updated: 2025-09-04T11:48:28Z
day: '01'
ddc:
- '530'
department:
- _id: CaHe
- _id: JoFi
- _id: MiSi
- _id: EM-Fac
- _id: NanoFab
doi: 10.1038/s41567-023-02302-1
external_id:
isi:
- '001138880800005'
pmid:
- '38370025'
file:
- access_level: open_access
checksum: 7891ebe7c900ae47469ab127031dd1ec
content_type: application/pdf
creator: dernst
date_created: 2024-07-16T12:12:43Z
date_updated: 2024-07-16T12:12:43Z
file_id: '17267'
file_name: 2024_NaturePhysics_CaballeroMancebo.pdf
file_size: 9897883
relation: main_file
success: 1
file_date_updated: 2024-07-16T12:12:43Z
has_accepted_license: '1'
intvolume: ' 20'
isi: 1
language:
- iso: eng
month: '02'
oa: 1
oa_version: Published Version
page: 310-321
pmid: 1
project:
- _id: 2646861A-B435-11E9-9278-68D0E5697425
call_identifier: FWF
grant_number: I03601
name: Control of embryonic cleavage pattern
publication: Nature Physics
publication_identifier:
eissn:
- 1745-2481
issn:
- 1745-2473
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
related_material:
link:
- description: News on ISTA Website
relation: press_release
url: https://ista.ac.at/en/news/stranger-than-friction-a-force-initiating-life/
scopus_import: '1'
status: public
title: Friction forces determine cytoplasmic reorganization and shape changes of ascidian
oocytes upon fertilization
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 20
year: '2024'
...
---
_id: '17410'
abstract:
- lang: eng
text: We present a cavity-electromechanical system comprising a superconducting
quantum interference device which is embedded in a microwave resonator and coupled
via a pickup loop to a 6-μg magnetically levitated superconducting sphere. The
motion of the sphere in the magnetic trap induces a frequency shift in the SQUID-cavity
system. We use microwave spectroscopy to characterize the system, and we demonstrate
that the electromechanical interaction is tunable. The measured displacement sensitivity
of 10−7m/√Hz defines a path towards ground-state cooling of levitated particles
with Planck-scale masses at millikelvin environment temperatures.
acknowledgement: We gratefully acknowledge valuable discussions with Uros Delic, Lorenzo
Magrini, and Corentin Gut. This work was supported by the European Union’s Horizon
2020 research and innovation program under Grant No. 863132 (iQLev) and No. 101080143
(SuperMeQ), the European Research Council under Grant No. 951234 (ERC Synergy QXtreme),
the Austrian and Bavarian Academy of Sciences (Topical Team SGQ), the Alexander
von Humboldt Foundation through a Feodor Lynen Fellowship (P.S.), the Swedish Research
Council under Grant No. 2020-00381 (G.H.), and the Deutsche Forschungsgemeinschaft
(DFG, German Research Foundation) via Germany’s Excellence Strategy EXC-2111-390814868
(H.H., R.G.).
article_number: '014078'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Philip
full_name: Schmidt, Philip
last_name: Schmidt
- first_name: Remi
full_name: Claessen, Remi
last_name: Claessen
- first_name: Gerard
full_name: Higgins, Gerard
last_name: Higgins
- first_name: Joachim
full_name: Hofer, Joachim
last_name: Hofer
- first_name: Jannek J.
full_name: Hansen, Jannek J.
last_name: Hansen
- first_name: Peter
full_name: Asenbaum, Peter
last_name: Asenbaum
- first_name: Martin
full_name: Zemlicka, Martin
id: 2DCF8DE6-F248-11E8-B48F-1D18A9856A87
last_name: Zemlicka
- first_name: Kevin
full_name: Uhl, Kevin
last_name: Uhl
- first_name: Reinhold
full_name: Kleiner, Reinhold
last_name: Kleiner
- first_name: Rudolf
full_name: Gross, Rudolf
last_name: Gross
- first_name: Hans
full_name: Huebl, Hans
last_name: Huebl
- first_name: Michael
full_name: Trupke, Michael
last_name: Trupke
- first_name: Markus
full_name: Aspelmeyer, Markus
last_name: Aspelmeyer
citation:
ama: Schmidt P, Claessen R, Higgins G, et al. Remote sensing of a levitated superconductor
with a flux-tunable microwave cavity. Physical Review Applied. 2024;22.
doi:10.1103/PhysRevApplied.22.014078
apa: Schmidt, P., Claessen, R., Higgins, G., Hofer, J., Hansen, J. J., Asenbaum,
P., … Aspelmeyer, M. (2024). Remote sensing of a levitated superconductor with
a flux-tunable microwave cavity. Physical Review Applied. American Physical
Society. https://doi.org/10.1103/PhysRevApplied.22.014078
chicago: Schmidt, Philip, Remi Claessen, Gerard Higgins, Joachim Hofer, Jannek J.
Hansen, Peter Asenbaum, Martin Zemlicka, et al. “Remote Sensing of a Levitated
Superconductor with a Flux-Tunable Microwave Cavity.” Physical Review Applied.
American Physical Society, 2024. https://doi.org/10.1103/PhysRevApplied.22.014078.
ieee: P. Schmidt et al., “Remote sensing of a levitated superconductor with
a flux-tunable microwave cavity,” Physical Review Applied, vol. 22. American
Physical Society, 2024.
ista: Schmidt P, Claessen R, Higgins G, Hofer J, Hansen JJ, Asenbaum P, Zemlicka
M, Uhl K, Kleiner R, Gross R, Huebl H, Trupke M, Aspelmeyer M. 2024. Remote sensing
of a levitated superconductor with a flux-tunable microwave cavity. Physical Review
Applied. 22, 014078.
mla: Schmidt, Philip, et al. “Remote Sensing of a Levitated Superconductor with
a Flux-Tunable Microwave Cavity.” Physical Review Applied, vol. 22, 014078,
American Physical Society, 2024, doi:10.1103/PhysRevApplied.22.014078.
short: P. Schmidt, R. Claessen, G. Higgins, J. Hofer, J.J. Hansen, P. Asenbaum,
M. Zemlicka, K. Uhl, R. Kleiner, R. Gross, H. Huebl, M. Trupke, M. Aspelmeyer,
Physical Review Applied 22 (2024).
date_created: 2024-08-11T22:01:12Z
date_published: 2024-07-30T00:00:00Z
date_updated: 2025-09-08T08:50:31Z
day: '30'
department:
- _id: JoFi
doi: 10.1103/PhysRevApplied.22.014078
external_id:
arxiv:
- '2401.08854'
isi:
- '001284571700002'
intvolume: ' 22'
isi: 1
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.48550/arXiv.2401.08854
month: '07'
oa: 1
oa_version: Preprint
publication: Physical Review Applied
publication_identifier:
eissn:
- 2331-7019
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Remote sensing of a levitated superconductor with a flux-tunable microwave
cavity
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 22
year: '2024'
...
---
DOAJ_listed: '1'
_id: '17477'
abstract:
- lang: eng
text: Trapped-ion systems are a leading platform for quantum information processing,
but they are currently limited to 1D and 2D arrays, which imposes restrictions
on both their scalability and their range of applications. Here, we propose a
path to overcome this limitation by demonstrating that Penning traps can be used
to realize remarkably clean bilayer crystals, wherein hundreds of ions self-organize
into two well-defined layers. These bilayer crystals are made possible by the
inclusion of an anharmonic trapping potential, which is readily implementable
with current technology. We study the normal modes of this system and discover
salient differences compared to the modes of single-plane crystals. The bilayer
geometry and the unique properties of the normal modes open new opportunities—in
particular, in quantum sensing and quantum simulation—that are not straightforward
in single-plane crystals. Furthermore, we illustrate that it may be possible to
extend the ideas presented here to realize multilayer crystals with more than
two layers. Our work increases the dimensionality of trapped-ion systems by efficiently
utilizing all three spatial dimensions, and it lays the foundation for a new generation
of quantum information processing experiments with multilayer 3D crystals of trapped
ions.
acknowledgement: We thank M. Miskeen Khan, Jennifer Lilieholm, and Wes Johnson for
a careful reading and feedback on the manuscript. We acknowledge discussions with
Dan Dubin, John Zaris, and Scott Parker. S. H. acknowledges the support of Kishore
Vaigyanik Protsahan Yojana, Department of Science and Technology, Government of
India. A. S. acknowledges the support of a C. V. Raman post-doctoral fellowship.
A. L. C., A. M. R., and J. J. B. acknowledge funding from the U.S. Department of
Energy, Office of Science, NQI Science Research Centers, Quantum Systems Accelerator
(QSA), a collaboration between the U.S. Department of Energy, Office of Science
and other agencies. A. M. R. acknowledges additional support from VBFF, ARO Grant
No. W911NF-24-1-0128, by the NSF Grants No. JILA-PFC PHY-2317149 and No. QLCI-OMA-2016244,
and by NIST. J. J. B. acknowledges additional support from the DARPA ONISQ program
and AFOSR Grant No. FA9550-201-0019.
article_number: '031030'
article_processing_charge: Yes
article_type: original
arxiv: 1
author:
- first_name: Samarth
full_name: Hawaldar, Samarth
id: 221708e1-1ff6-11ee-9fa6-85146607433e
last_name: Hawaldar
orcid: 0000-0002-1965-4309
- first_name: Prakriti
full_name: Shahi, Prakriti
last_name: Shahi
- first_name: Allison L.
full_name: Carter, Allison L.
last_name: Carter
- first_name: Ana Maria
full_name: Rey, Ana Maria
last_name: Rey
- first_name: John J.
full_name: Bollinger, John J.
last_name: Bollinger
- first_name: Athreya
full_name: Shankar, Athreya
last_name: Shankar
citation:
ama: Hawaldar S, Shahi P, Carter AL, Rey AM, Bollinger JJ, Shankar A. Bilayer crystals
of trapped ions for quantum information processing. Physical Review X.
2024;14(3). doi:10.1103/PhysRevX.14.031030
apa: Hawaldar, S., Shahi, P., Carter, A. L., Rey, A. M., Bollinger, J. J., &
Shankar, A. (2024). Bilayer crystals of trapped ions for quantum information processing.
Physical Review X. American Physical Society. https://doi.org/10.1103/PhysRevX.14.031030
chicago: Hawaldar, Samarth, Prakriti Shahi, Allison L. Carter, Ana Maria Rey, John
J. Bollinger, and Athreya Shankar. “Bilayer Crystals of Trapped Ions for Quantum
Information Processing.” Physical Review X. American Physical Society,
2024. https://doi.org/10.1103/PhysRevX.14.031030.
ieee: S. Hawaldar, P. Shahi, A. L. Carter, A. M. Rey, J. J. Bollinger, and A. Shankar,
“Bilayer crystals of trapped ions for quantum information processing,” Physical
Review X, vol. 14, no. 3. American Physical Society, 2024.
ista: Hawaldar S, Shahi P, Carter AL, Rey AM, Bollinger JJ, Shankar A. 2024. Bilayer
crystals of trapped ions for quantum information processing. Physical Review X.
14(3), 031030.
mla: Hawaldar, Samarth, et al. “Bilayer Crystals of Trapped Ions for Quantum Information
Processing.” Physical Review X, vol. 14, no. 3, 031030, American Physical
Society, 2024, doi:10.1103/PhysRevX.14.031030.
short: S. Hawaldar, P. Shahi, A.L. Carter, A.M. Rey, J.J. Bollinger, A. Shankar,
Physical Review X 14 (2024).
corr_author: '1'
date_created: 2024-09-01T22:01:08Z
date_published: 2024-08-16T00:00:00Z
date_updated: 2025-09-08T09:07:29Z
day: '16'
ddc:
- '530'
department:
- _id: JoFi
doi: 10.1103/PhysRevX.14.031030
external_id:
arxiv:
- '2312.10681'
isi:
- '001293977800002'
file:
- access_level: open_access
checksum: 5d39b7dda67fd7b9a960235f6f38e280
content_type: application/pdf
creator: cchlebak
date_created: 2024-09-06T09:43:53Z
date_updated: 2024-09-06T09:43:53Z
file_id: '17757'
file_name: 2024_PhysRevX_Hawaldar.pdf
file_size: 3909653
relation: main_file
success: 1
file_date_updated: 2024-09-06T09:43:53Z
has_accepted_license: '1'
intvolume: ' 14'
isi: 1
issue: '3'
language:
- iso: eng
month: '08'
oa: 1
oa_version: Published Version
publication: Physical Review X
publication_identifier:
eissn:
- 2160-3308
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Bilayer crystals of trapped ions for quantum information processing
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 14
year: '2024'
...
---
OA_place: publisher
_id: '17133'
abstract:
- lang: eng
text: "An ideal quantum computer relies on qubits capable of performing fast gate
operations and\r\nmaintaining strong interconnections while preserving their quantum
coherence. Since the\r\ninception of experimental eforts toward building a quantum
computer, the community has\r\nfaced challenges in engineering such a system.
Among the various methods of implementing a\r\nquantum computer, superconducting
qubits have shown fast gates close to tens of nanoseconds,\r\nwith the state-of-the-art
reaching a coherence of a few milliseconds. However, achieving\r\nsimultaneously
long lifetimes with fast qubit operations poses an inherent paradox. Qubits\r\nwith
high coherence require isolation from the environment, while fast operation necessitates\r\nstrong
coupling of the qubit. This thesis approaches this issue by proposing the idea
of\r\nengineering superconducting qubits capable of transitioning between operating
in a protected\r\nregime, where the qubit is completely isolated from the environment,
and coupling to the\r\ncommunication channels as needed. In this direction, we
use the geometric superinductor to\r\nscan the parameter space of rf-SQUID devices,
searching for a regime where we can take the\r\nqubit protection to its extreme.\r\n\r\nThis
leads us to the inductively shunted transmon (IST) regime, characterized by EJ
/EC ≫ 1\r\nand EJ /EL ≫ 1, where the circuit potential exhibits a double well
with a large barrier\r\nseparating the local ground states of each quantum well.
In this regime, although it is\r\nanticipated that the two quantum wells would
be isolated from each other, we observe single\r\nfuxon tunneling between them.
The interplay of the cavity photons and the fuxon transition\r\nforms a rich physical
system, containing resonance conditions that allow the preparation of the\r\nfuxon
ground or excited states. This enables us to study the relaxation rate of such
transition\r\nand show that it can be as large as 3.6 hours. Dynamically controlling
the barrier height\r\nbetween the two quantum wells allows for controllable coupling,
which scales exponentially,\r\nfor a qubit encoded in two fuxon states.\r\nThe
0-π qubit is one of the very few known superconducting circuit types that ofers
exponential\r\nprotection from both relaxation and dephasing simultaneously. However,
this qubit is not\r\nexempt from the fact that such protection comes at the expense
of complex readout and\r\ncontrol. In this thesis, we propose a way to controllably
break the circuit symmetry, the\r\nkey reason for the protection, to momentarily
restore the ability to control and manipulate\r\nthe qubit. An asymmetry in capacitances
and inductances in the 0-π circuit is detrimental\r\nsince they lead to coupling
of the protected state to the thermally occupied parasitic mode\r\nof the circuit.
However, here we try to exploit a controlled asymmetry in Josephson energies\r\nand
show that this can be used as a tunable coupler between the protected states.
In the\r\nfuture, this should allow to perform gate operations by dynamically
controlling the asymmetry\r\ninstead of driving the protected transition with
microwave pulses. Therefore, we believe that\r\nthe proposed method can make the
use of protected qubits more practical in experimental\r\nrealizations of quantum
computing."
acknowledged_ssus:
- _id: NanoFab
- _id: M-Shop
alternative_title:
- ISTA Thesis
article_processing_charge: No
author:
- first_name: Farid
full_name: Hassani, Farid
id: 2AED110C-F248-11E8-B48F-1D18A9856A87
last_name: Hassani
orcid: 0000-0001-6937-5773
citation:
ama: Hassani F. Superconducting qubits capable of dynamic switching between protected
and high-speed control regimes. 2024. doi:10.15479/at:ista:17133
apa: Hassani, F. (2024). Superconducting qubits capable of dynamic switching
between protected and high-speed control regimes. Institute of Science and
Technology Austria. https://doi.org/10.15479/at:ista:17133
chicago: Hassani, Farid. “Superconducting Qubits Capable of Dynamic Switching between
Protected and High-Speed Control Regimes.” Institute of Science and Technology
Austria, 2024. https://doi.org/10.15479/at:ista:17133.
ieee: F. Hassani, “Superconducting qubits capable of dynamic switching between protected
and high-speed control regimes,” Institute of Science and Technology Austria,
2024.
ista: Hassani F. 2024. Superconducting qubits capable of dynamic switching between
protected and high-speed control regimes. Institute of Science and Technology
Austria.
mla: Hassani, Farid. Superconducting Qubits Capable of Dynamic Switching between
Protected and High-Speed Control Regimes. Institute of Science and Technology
Austria, 2024, doi:10.15479/at:ista:17133.
short: F. Hassani, Superconducting Qubits Capable of Dynamic Switching between Protected
and High-Speed Control Regimes, Institute of Science and Technology Austria, 2024.
corr_author: '1'
date_created: 2024-06-11T18:20:05Z
date_published: 2024-06-11T00:00:00Z
date_updated: 2026-04-15T06:43:02Z
day: '11'
ddc:
- '530'
degree_awarded: PhD
department:
- _id: GradSch
- _id: JoFi
doi: 10.15479/at:ista:17133
file:
- access_level: open_access
checksum: 258c353d47fa37ea63ea43b1e10a34a0
content_type: application/pdf
creator: fhassani
date_created: 2024-06-12T07:53:19Z
date_updated: 2024-06-20T11:52:22Z
file_id: '17137'
file_name: Thesis_main_final.pdf
file_size: 28370759
relation: main_file
- access_level: closed
checksum: deffa5d0db88093f74812fa71520d5e1
content_type: text/x-tex
creator: fhassani
date_created: 2024-06-12T07:54:27Z
date_updated: 2024-06-12T07:54:27Z
file_id: '17138'
file_name: Thesis_main.tex
file_size: 445735
relation: source_file
file_date_updated: 2024-06-20T11:52:22Z
has_accepted_license: '1'
keyword:
- Quantum information
- Qubits
- Superconducting devices
language:
- iso: eng
month: '06'
oa: 1
oa_version: Published Version
page: '161'
project:
- _id: 9B861AAC-BA93-11EA-9121-9846C619BF3A
name: NOMIS Fellowship Program
- _id: bdb108fd-d553-11ed-ba76-83dc74a9864f
grant_number: F07105
name: QUANTUM INFORMATION SYSTEMS BEYOND CLASSICAL CAPABILITIES / P5- Integration
of Superconducting Quantum Circuits
publication_identifier:
isbn:
- 978-3-99078-040-4
issn:
- 2663-337X
publication_status: published
publisher: Institute of Science and Technology Austria
related_material:
record:
- id: '13227'
relation: part_of_dissertation
status: public
- id: '9928'
relation: part_of_dissertation
status: public
- id: '8755'
relation: part_of_dissertation
status: public
status: public
supervisor:
- first_name: Johannes M
full_name: Fink, Johannes M
id: 4B591CBA-F248-11E8-B48F-1D18A9856A87
last_name: Fink
orcid: 0000-0001-8112-028X
title: Superconducting qubits capable of dynamic switching between protected and high-speed
control regimes
tmp:
image: /images/cc_by_nc_sa.png
legal_code_url: https://creativecommons.org/licenses/by-nc-sa/4.0/legalcode
name: Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC
BY-NC-SA 4.0)
short: CC BY-NC-SA (4.0)
type: dissertation
user_id: ba8df636-2132-11f1-aed0-ed93e2281fdd
year: '2024'
...
---
APC_amount: 6828 EUR
DOAJ_listed: '1'
OA_place: publisher
OA_type: gold
_id: '17202'
abstract:
- lang: eng
text: Gate-tunable transmons (gatemons) employing semiconductor Josephson junctions
have recently emerged as building blocks for hybrid quantum circuits. In this
study, we present a gatemon fabricated in planar Germanium. We induce superconductivity
in a two-dimensional hole gas by evaporating aluminum atop a thin spacer, which
separates the superconductor from the Ge quantum well. The Josephson junction
is then integrated into an Xmon circuit and capacitively coupled to a transmission
line resonator. We showcase the qubit tunability in a broad frequency range with
resonator and two-tone spectroscopy. Time-domain characterizations reveal energy
relaxation and coherence times up to 75 ns. Our results, combined with the recent
advances in the spin qubit field, pave the way towards novel hybrid and protected
qubits in a group IV, CMOS-compatible material.
acknowledged_ssus:
- _id: ScienComp
- _id: M-Shop
- _id: NanoFab
acknowledgement: "We acknowledge Lucas Casparis, Jeroen Danon, Valla Fatemi, Morten
Kjaergard and Javad Shabani for their valuable insights and comments. This research
was supported by the Scientific Service Units of ISTA through resources provided
by the MIBA Machine Shop\r\nand the Nanofabrication facility. This research and
related results were made possible with the support of the NOMIS Foundation and
the FWF Projects with DOI:10.55776/I5060 and DOI:10.55776/P36507. We also acknowledge
the NextGenerationEU PRIN project\r\n2022A8CJP3 (GAMESQUAD) for partial financial
support."
article_number: '6400'
article_processing_charge: Yes
article_type: original
arxiv: 1
author:
- first_name: Oliver
full_name: Sagi, Oliver
id: 71616374-A8E9-11E9-A7CA-09ECE5697425
last_name: Sagi
- first_name: Alessandro
full_name: Crippa, Alessandro
id: 1F2B21A2-F6E7-11E9-9B82-F7DBE5697425
last_name: Crippa
orcid: 0000-0002-2968-611X
- first_name: Marco
full_name: Valentini, Marco
id: C0BB2FAC-D767-11E9-B658-BC13E6697425
last_name: Valentini
- first_name: Marian
full_name: Janik, Marian
id: 396A1950-F248-11E8-B48F-1D18A9856A87
last_name: Janik
orcid: 0009-0003-9037-8831
- first_name: Levon
full_name: Baghumyan, Levon
id: 7aa1f788-b527-11ee-aa9e-e6111a79e0c7
last_name: Baghumyan
- first_name: Giorgio
full_name: Fabris, Giorgio
id: 298cf6f3-1ff6-11ee-9fa6-d94cfa0b3352
last_name: Fabris
- first_name: Lucky
full_name: Kapoor, Lucky
id: 84b9700b-15b2-11ec-abd3-831089e67615
last_name: Kapoor
orcid: 0000-0001-8319-2148
- first_name: Farid
full_name: Hassani, Farid
id: 2AED110C-F248-11E8-B48F-1D18A9856A87
last_name: Hassani
orcid: 0000-0001-6937-5773
- first_name: Johannes M
full_name: Fink, Johannes M
id: 4B591CBA-F248-11E8-B48F-1D18A9856A87
last_name: Fink
orcid: 0000-0001-8112-028X
- first_name: Stefano
full_name: Calcaterra, Stefano
last_name: Calcaterra
- first_name: Daniel
full_name: Chrastina, Daniel
last_name: Chrastina
- first_name: Giovanni
full_name: Isella, Giovanni
last_name: Isella
- first_name: Georgios
full_name: Katsaros, Georgios
id: 38DB5788-F248-11E8-B48F-1D18A9856A87
last_name: Katsaros
orcid: 0000-0001-8342-202X
citation:
ama: Sagi O, Crippa A, Valentini M, et al. A gate tunable transmon qubit in planar
Ge. Nature Communications. 2024;15. doi:10.1038/s41467-024-50763-6
apa: Sagi, O., Crippa, A., Valentini, M., Janik, M., Baghumyan, L., Fabris, G.,
… Katsaros, G. (2024). A gate tunable transmon qubit in planar Ge. Nature Communications.
Springer Nature. https://doi.org/10.1038/s41467-024-50763-6
chicago: Sagi, Oliver, Alessandro Crippa, Marco Valentini, Marian Janik, Levon Baghumyan,
Giorgio Fabris, Lucky Kapoor, et al. “A Gate Tunable Transmon Qubit in Planar
Ge.” Nature Communications. Springer Nature, 2024. https://doi.org/10.1038/s41467-024-50763-6.
ieee: O. Sagi et al., “A gate tunable transmon qubit in planar Ge,” Nature
Communications, vol. 15. Springer Nature, 2024.
ista: Sagi O, Crippa A, Valentini M, Janik M, Baghumyan L, Fabris G, Kapoor L, Hassani
F, Fink JM, Calcaterra S, Chrastina D, Isella G, Katsaros G. 2024. A gate tunable
transmon qubit in planar Ge. Nature Communications. 15, 6400.
mla: Sagi, Oliver, et al. “A Gate Tunable Transmon Qubit in Planar Ge.” Nature
Communications, vol. 15, 6400, Springer Nature, 2024, doi:10.1038/s41467-024-50763-6.
short: O. Sagi, A. Crippa, M. Valentini, M. Janik, L. Baghumyan, G. Fabris, L. Kapoor,
F. Hassani, J.M. Fink, S. Calcaterra, D. Chrastina, G. Isella, G. Katsaros, Nature
Communications 15 (2024).
corr_author: '1'
date_created: 2024-07-04T11:40:45Z
date_published: 2024-07-30T00:00:00Z
date_updated: 2026-04-07T13:01:55Z
day: '30'
ddc:
- '530'
department:
- _id: GeKa
- _id: JoFi
- _id: GradSch
doi: 10.1038/s41467-024-50763-6
external_id:
arxiv:
- '2403.16774'
isi:
- '001281271000022'
pmid:
- '39080279'
file:
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checksum: ddf5361dcb6c543e2cea818501c09910
content_type: application/pdf
creator: dernst
date_created: 2024-08-05T08:38:01Z
date_updated: 2024-08-05T08:38:01Z
file_id: '17388'
file_name: 2024_NatureComm_Sagi.pdf
file_size: 1928001
relation: main_file
success: 1
file_date_updated: 2024-08-05T08:38:01Z
has_accepted_license: '1'
intvolume: ' 15'
isi: 1
language:
- iso: eng
month: '07'
oa: 1
oa_version: Published Version
pmid: 1
project:
- _id: bd8bd29e-d553-11ed-ba76-f0070d4b237a
grant_number: P36507
name: Merging spin and superconducting qubits in planar Ge
- _id: c0977eea-5a5b-11eb-8a69-a862db0cf4d1
grant_number: I05060
name: High impedance circuit quantum electrodynamics with hole spins
- _id: 262116AA-B435-11E9-9278-68D0E5697425
name: Hybrid Semiconductor - Superconductor Quantum Devices
- _id: 3AC91DDA-15DF-11EA-824D-93A3E7B544D1
call_identifier: FWF
name: FWF Open Access Fund
publication: Nature Communications
publication_identifier:
eissn:
- 2041-1723
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
related_material:
link:
- relation: erratum
url: https://doi.org/10.1038/s41467-024-53910-1
record:
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relation: research_data
status: public
- id: '18076'
relation: dissertation_contains
status: public
scopus_import: '1'
status: public
title: A gate tunable transmon qubit in planar Ge
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 15
year: '2024'
...
---
_id: '17196'
abstract:
- lang: eng
text: This .zip File contains the data for the figures presented in the main text
and supplementary material of "A gate tunable transmon qubit in planar Ge" by
O.Sagi et al. The measurements were done using Qcodes. The description of the
files and the instructions on opening the data can be found in the Readme. An
additional Jupyter Notebook is attached that walks through the data analysis.
acknowledged_ssus:
- _id: NanoFab
- _id: M-Shop
acknowledgement: 'This research was supported by the Scientific Service Units of ISTA
through resources provided by the MIBA Machine Shop and the Nanofabrication facility. '
article_processing_charge: No
author:
- first_name: Oliver
full_name: Sagi, Oliver
id: 71616374-A8E9-11E9-A7CA-09ECE5697425
last_name: Sagi
citation:
ama: Sagi O. A gate-tunable transmon in planar Ge. 2024. doi:10.15479/AT:ISTA:17196
apa: Sagi, O. (2024). A gate-tunable transmon in planar Ge. Institute of Science
and Technology Austria. https://doi.org/10.15479/AT:ISTA:17196
chicago: Sagi, Oliver. “A Gate-Tunable Transmon in Planar Ge.” Institute of Science
and Technology Austria, 2024. https://doi.org/10.15479/AT:ISTA:17196.
ieee: O. Sagi, “A gate-tunable transmon in planar Ge.” Institute of Science and
Technology Austria, 2024.
ista: Sagi O. 2024. A gate-tunable transmon in planar Ge, Institute of Science and
Technology Austria, 10.15479/AT:ISTA:17196.
mla: Sagi, Oliver. A Gate-Tunable Transmon in Planar Ge. Institute of Science
and Technology Austria, 2024, doi:10.15479/AT:ISTA:17196.
short: O. Sagi, (2024).
contributor:
- contributor_type: project_member
first_name: Alessandro
id: 1F2B21A2-F6E7-11E9-9B82-F7DBE5697425
last_name: Crippa
orcid: 0000-0002-2968-611X
- contributor_type: project_member
first_name: Marco
id: C0BB2FAC-D767-11E9-B658-BC13E6697425
last_name: Valentini
- contributor_type: project_member
first_name: Marian
id: 396A1950-F248-11E8-B48F-1D18A9856A87
last_name: Janik
- contributor_type: project_member
first_name: Levon
id: 7aa1f788-b527-11ee-aa9e-e6111a79e0c7
last_name: Baghumyan
- contributor_type: project_member
first_name: Giorgio
id: 298cf6f3-1ff6-11ee-9fa6-d94cfa0b3352
last_name: Fabris
- contributor_type: project_member
first_name: Lucky
id: 84b9700b-15b2-11ec-abd3-831089e67615
last_name: Kapoor
- contributor_type: project_member
first_name: Farid
id: 2AED110C-F248-11E8-B48F-1D18A9856A87
last_name: Hassani
orcid: 0000-0001-6937-5773
- contributor_type: project_member
first_name: Johannes M
id: 4B591CBA-F248-11E8-B48F-1D18A9856A87
last_name: Fink
orcid: 0000-0001-8112-028X
- contributor_type: project_member
first_name: Stefano
last_name: Calcaterra
- contributor_type: project_member
first_name: Daniel
last_name: Chrastina
- contributor_type: project_member
first_name: Giovanni
last_name: Isella
- contributor_type: supervisor
first_name: Georgios
id: 38DB5788-F248-11E8-B48F-1D18A9856A87
last_name: Katsaros
orcid: 0000-0001-8342-202X
corr_author: '1'
date_created: 2024-07-04T10:14:34Z
date_published: 2024-07-04T00:00:00Z
date_updated: 2026-04-16T12:20:39Z
day: '04'
ddc:
- '530'
department:
- _id: GradSch
- _id: GeKa
- _id: JoFi
doi: 10.15479/AT:ISTA:17196
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month: '07'
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oa_version: Published Version
project:
- _id: c0977eea-5a5b-11eb-8a69-a862db0cf4d1
grant_number: I05060
name: High impedance circuit quantum electrodynamics with hole spins
- _id: 262116AA-B435-11E9-9278-68D0E5697425
name: Hybrid Semiconductor - Superconductor Quantum Devices
- _id: bd8bd29e-d553-11ed-ba76-f0070d4b237a
grant_number: P36507
name: Merging spin and superconducting qubits in planar Ge
publisher: Institute of Science and Technology Austria
related_material:
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- id: '17202'
relation: used_in_publication
status: public
status: public
title: A gate-tunable transmon in planar Ge
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: research_data
user_id: 68b8ca59-c5b3-11ee-8790-cd641c68093d
year: '2024'
...
---
OA_place: repository
_id: '18144'
abstract:
- lang: eng
text: "High kinetic inductance superconductors are gaining increasing interest for\r\nthe
realisation of qubits, amplifiers and detectors. Moreover, thanks to their\r\nhigh
impedance, quantum buses made of such materials enable large zero-point\r\nfluctuations
of the voltage, boosting the coupling rates to spin and charge\r\nqubits. However,
fully exploiting the potential of disordered or granular\r\nsuperconductors is
challenging, as their inductance and, therefore, impedance\r\nat high values are
difficult to control. Here we have integrated a granular\r\naluminium resonator,
having a characteristic impedance exceeding the resistance\r\nquantum, with a
germanium double quantum dot and demonstrate strong\r\ncharge-photon coupling
with a rate of $g_\\text{c}/2\\pi= (566 \\pm 2)$ MHz. This\r\nwas achieved due
to the realisation of a wireless ohmmeter, which allows\r\n\\emph{in situ} measurements
during film deposition and, therefore, control of\r\nthe kinetic inductance of
granular aluminium films. Reproducible fabrication of\r\ncircuits with impedances
(inductances) exceeding 13 k$\\Omega$ (1 nH per square)\r\nis now possible. This
broadly applicable method opens the path for novel qubits\r\nand high-fidelity,
long-distance two-qubit gates."
acknowledged_ssus:
- _id: M-Shop
- _id: NanoFab
acknowledgement: "We acknowledge Franco De Palma, Mahya Khorramshahi, Fabian Oppliger,
Thomas Reisinger, Pasquale Scarlino and Xiao Xue for helpful discussions. This research
was supported by the Scientific Service Units of ISTA through resources provided
by the MIBA Machine Shop and the Nanofabrication facility. This research and related
results were made possible with the support of the NOMIS Foundation, the HORIZON-RIA
101069515 project, the FWF Projects with DOI:10.55776/P32235, DOI:10.55776/I5060
and DOI:10.55776/P36507. IMP acknowledges funding from the Deutsche Forschungsgemeinschaft
(DFG – German Research Foundation) under project number 450396347 (GeHoldeQED).
ICN2 acknowledges funding from Generalitat de Catalunya 2021SGR00457. We acknowledge
support from CSIC Interdisciplinary Thematic Platform (PTI+) on Quantum Technologies
(PTI-QTEP+). This research work has been funded by the European Commission – NextGenerationEU
(Regulation EU 2020/2094), through CSIC’s\r\nQuantum Technologies Platform (QTEP).
ICN2 is supported by the Severo Ochoa program from Spanish MCIN/AEI (Grant No.:
CEX2021-001214-S) and is funded by the CERCA Programme/Generalitat de Catalunya.
Part of the present work has been performed in the framework of Universitat Autònoma
de Barcelona Materials Science PhD program. AGM has received funding from Grant
RYC2021-033479-I funded by MCIN/AEI/10.13039/501100011033 and by European Union
NextGenerationEU/PRTR. M.B. acknowledges support from SUR Generalitat de Catalunya
and the EU Social Fund; project ref. 2020 FI 00103. The authors\r\nacknowledge the
use of instrumentation and the technical advice provided by the Joint Electron Microscopy
Center at ALBA (JEMCA). ICN2 acknowledges funding from Grant IU16-014206 (METCAM-FIB)
funded by the European Union through the European Regional Development\r\nFund (ERDF),
with the support of the Ministry of Research and Universities, Generalitat de Catalunya.
ICN2 is a founding member of e-DREAM [60]."
article_number: '2407.03079'
article_processing_charge: No
arxiv: 1
author:
- first_name: Marian
full_name: Janik, Marian
id: 396A1950-F248-11E8-B48F-1D18A9856A87
last_name: Janik
orcid: 0009-0003-9037-8831
- first_name: Kevin Etienne Robert
full_name: Roux, Kevin Etienne Robert
id: 53f93ea2-803f-11ed-ab7e-b283135794ef
last_name: Roux
- first_name: Carla N
full_name: Borja Espinosa, Carla N
id: 18777c01-896a-11ed-bdf8-e4851dc07d16
last_name: Borja Espinosa
- first_name: Oliver
full_name: Sagi, Oliver
id: 71616374-A8E9-11E9-A7CA-09ECE5697425
last_name: Sagi
- first_name: Abdulhamid
full_name: Baghdadi, Abdulhamid
id: 160D87FA-96B5-11E9-BF77-7626E6697425
last_name: Baghdadi
- first_name: Thomas
full_name: Adletzberger, Thomas
id: 38756BB2-F248-11E8-B48F-1D18A9856A87
last_name: Adletzberger
- first_name: Stefano
full_name: Calcaterra, Stefano
last_name: Calcaterra
- first_name: Marc
full_name: Botifoll, Marc
last_name: Botifoll
- first_name: Alba Garzón
full_name: Manjón, Alba Garzón
last_name: Manjón
- first_name: Jordi
full_name: Arbiol, Jordi
last_name: Arbiol
- first_name: Daniel
full_name: Chrastina, Daniel
last_name: Chrastina
- first_name: Giovanni
full_name: Isella, Giovanni
last_name: Isella
- first_name: Ioan M.
full_name: Pop, Ioan M.
last_name: Pop
- first_name: Georgios
full_name: Katsaros, Georgios
id: 38DB5788-F248-11E8-B48F-1D18A9856A87
last_name: Katsaros
orcid: 0000-0001-8342-202X
citation:
ama: Janik M, Roux KER, Borja Espinosa CN, et al. Strong charge-photon coupling
in planar germanium enabled by granular aluminium superinductors. arXiv.
doi:10.48550/arXiv.2407.03079
apa: Janik, M., Roux, K. E. R., Borja Espinosa, C. N., Sagi, O., Baghdadi, A., Adletzberger,
T., … Katsaros, G. (n.d.). Strong charge-photon coupling in planar germanium enabled
by granular aluminium superinductors. arXiv. https://doi.org/10.48550/arXiv.2407.03079
chicago: Janik, Marian, Kevin Etienne Robert Roux, Carla N Borja Espinosa, Oliver
Sagi, Abdulhamid Baghdadi, Thomas Adletzberger, Stefano Calcaterra, et al. “Strong
Charge-Photon Coupling in Planar Germanium Enabled by Granular Aluminium Superinductors.”
ArXiv, n.d. https://doi.org/10.48550/arXiv.2407.03079.
ieee: M. Janik et al., “Strong charge-photon coupling in planar germanium
enabled by granular aluminium superinductors,” arXiv. .
ista: Janik M, Roux KER, Borja Espinosa CN, Sagi O, Baghdadi A, Adletzberger T,
Calcaterra S, Botifoll M, Manjón AG, Arbiol J, Chrastina D, Isella G, Pop IM,
Katsaros G. Strong charge-photon coupling in planar germanium enabled by granular
aluminium superinductors. arXiv, 2407.03079.
mla: Janik, Marian, et al. “Strong Charge-Photon Coupling in Planar Germanium Enabled
by Granular Aluminium Superinductors.” ArXiv, 2407.03079, doi:10.48550/arXiv.2407.03079.
short: M. Janik, K.E.R. Roux, C.N. Borja Espinosa, O. Sagi, A. Baghdadi, T. Adletzberger,
S. Calcaterra, M. Botifoll, A.G. Manjón, J. Arbiol, D. Chrastina, G. Isella, I.M.
Pop, G. Katsaros, ArXiv (n.d.).
corr_author: '1'
date_created: 2024-09-26T09:50:43Z
date_published: 2024-07-03T00:00:00Z
date_updated: 2026-04-26T22:30:22Z
day: '03'
department:
- _id: GeKa
- _id: GradSch
- _id: JoFi
doi: 10.48550/arXiv.2407.03079
external_id:
arxiv:
- '2407.03079'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.48550/arXiv.2407.03079
month: '07'
oa: 1
oa_version: Preprint
project:
- _id: 34c0acea-11ca-11ed-8bc3-8775e10fd452
grant_number: '101069515'
name: Integrated Germanium Quantum Technology
- _id: 237B3DA4-32DE-11EA-91FC-C7463DDC885E
call_identifier: FWF
grant_number: P32235
name: Towards scalable hut wire quantum devices
- _id: bd8bd29e-d553-11ed-ba76-f0070d4b237a
grant_number: P36507
name: Merging spin and superconducting qubits in planar Ge
- _id: c0977eea-5a5b-11eb-8a69-a862db0cf4d1
grant_number: I05060
name: High impedance circuit quantum electrodynamics with hole spins
publication: arXiv
publication_status: draft
related_material:
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relation: research_data
status: public
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relation: later_version
status: public
- id: '18129'
relation: dissertation_contains
status: public
status: public
title: Strong charge-photon coupling in planar germanium enabled by granular aluminium
superinductors
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: preprint
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
year: '2024'
...