---
_id: '15004'
abstract:
- lang: eng
text: The impulsive limit (the “sudden approximation”) has been widely employed
to describe the interaction between molecules and short, far-off-resonant laser
pulses. This approximation assumes that the timescale of the laser-molecule interaction
is significantly shorter than the internal rotational period of the molecule,
resulting in the rotational motion being instantaneously “frozen” during the interaction.
This simplified description of the laser-molecule interaction is incorporated
in various theoretical models predicting rotational dynamics of molecules driven
by short laser pulses. In this theoretical work, we develop an effective theory
for ultrashort laser pulses by examining the full time-evolution operator and
solving the time-dependent Schrödinger equation at the operator level. Our findings
reveal a critical angular momentum, lcrit, at which the impulsive limit breaks
down. In other words, the validity of the sudden approximation depends not only
on the pulse duration but also on its intensity, since the latter determines how
many angular momentum states are populated. We explore both ultrashort multicycle
(Gaussian) pulses and the somewhat less studied half-cycle pulses, which produce
distinct effective potentials. We discuss the limitations of the impulsive limit
and propose a method that rescales the effective matrix elements, enabling an
improved and more accurate description of laser-molecule interactions.
acknowledgement: We thank Bretislav Friedrich, Marjan Mirahmadi, Artem Volosniev,
and Burkhard Schmidt for insightful discussions. M.L. acknowledges support by the
European Research Council (ERC) under Starting Grant No. 801770 (ANGULON).
article_number: '023101'
article_processing_charge: No
article_type: original
author:
- first_name: Volker
full_name: Karle, Volker
id: D7C012AE-D7ED-11E9-95E8-1EC5E5697425
last_name: Karle
orcid: 0000-0002-6963-0129
- first_name: Mikhail
full_name: Lemeshko, Mikhail
id: 37CB05FA-F248-11E8-B48F-1D18A9856A87
last_name: Lemeshko
orcid: 0000-0002-6990-7802
citation:
ama: 'Karle V, Lemeshko M. Modeling laser pulses as δ kicks: Reevaluating the impulsive
limit in molecular rotational dynamics. Physical Review A. 2024;109(2).
doi:10.1103/PhysRevA.109.023101'
apa: 'Karle, V., & Lemeshko, M. (2024). Modeling laser pulses as δ kicks: Reevaluating
the impulsive limit in molecular rotational dynamics. Physical Review A.
American Physical Society. https://doi.org/10.1103/PhysRevA.109.023101'
chicago: 'Karle, Volker, and Mikhail Lemeshko. “Modeling Laser Pulses as δ Kicks:
Reevaluating the Impulsive Limit in Molecular Rotational Dynamics.” Physical
Review A. American Physical Society, 2024. https://doi.org/10.1103/PhysRevA.109.023101.'
ieee: 'V. Karle and M. Lemeshko, “Modeling laser pulses as δ kicks: Reevaluating
the impulsive limit in molecular rotational dynamics,” Physical Review A,
vol. 109, no. 2. American Physical Society, 2024.'
ista: 'Karle V, Lemeshko M. 2024. Modeling laser pulses as δ kicks: Reevaluating
the impulsive limit in molecular rotational dynamics. Physical Review A. 109(2),
023101.'
mla: 'Karle, Volker, and Mikhail Lemeshko. “Modeling Laser Pulses as δ Kicks: Reevaluating
the Impulsive Limit in Molecular Rotational Dynamics.” Physical Review A,
vol. 109, no. 2, 023101, American Physical Society, 2024, doi:10.1103/PhysRevA.109.023101.'
short: V. Karle, M. Lemeshko, Physical Review A 109 (2024).
date_created: 2024-02-18T23:01:01Z
date_published: 2024-02-01T00:00:00Z
date_updated: 2024-02-26T09:45:20Z
day: '01'
department:
- _id: MiLe
doi: 10.1103/PhysRevA.109.023101
ec_funded: 1
external_id:
arxiv:
- '2307.07256'
intvolume: ' 109'
issue: '2'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.48550/arXiv.2307.07256
month: '02'
oa: 1
oa_version: Preprint
project:
- _id: 2688CF98-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '801770'
name: 'Angulon: physics and applications of a new quasiparticle'
publication: Physical Review A
publication_identifier:
eissn:
- 2469-9934
issn:
- 2469-9926
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'Modeling laser pulses as δ kicks: Reevaluating the impulsive limit in molecular
rotational dynamics'
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 109
year: '2024'
...
---
_id: '15167'
abstract:
- lang: eng
text: We perform a diagrammatic analysis of the energy of a mobile impurity immersed
in a strongly interacting two-component Fermi gas to second order in the impurity-bath
interaction. These corrections demonstrate divergent behavior in the limit of
large impurity momentum. We show the fundamental processes responsible for these
logarithmically divergent terms. We study the problem in the general case without
any assumptions regarding the fermion-fermion interactions in the bath. We show
that the divergent term can be summed up to all orders in the Fermi-Fermi interaction
and that the resulting expression is equivalent to the one obtained in the few-body
calculation. Finally, we provide a perturbative calculation to the second order
in the Fermi-Fermi interaction, and we show the diagrams responsible for these
terms.
acknowledgement: We thank Félix Werner and Kris Van Houcke for interesting discussions.
article_number: '033315'
article_processing_charge: No
article_type: original
author:
- first_name: Ragheed
full_name: Al Hyder, Ragheed
id: d1c405be-ae15-11ed-8510-ccf53278162e
last_name: Al Hyder
- first_name: F.
full_name: Chevy, F.
last_name: Chevy
- first_name: X.
full_name: Leyronas, X.
last_name: Leyronas
citation:
ama: Al Hyder R, Chevy F, Leyronas X. Exploring beyond-mean-field logarithmic divergences
in Fermi-polaron energy. Physical Review A. 2024;109(3). doi:10.1103/PhysRevA.109.033315
apa: Al Hyder, R., Chevy, F., & Leyronas, X. (2024). Exploring beyond-mean-field
logarithmic divergences in Fermi-polaron energy. Physical Review A. American
Physical Society. https://doi.org/10.1103/PhysRevA.109.033315
chicago: Al Hyder, Ragheed, F. Chevy, and X. Leyronas. “Exploring Beyond-Mean-Field
Logarithmic Divergences in Fermi-Polaron Energy.” Physical Review A. American
Physical Society, 2024. https://doi.org/10.1103/PhysRevA.109.033315.
ieee: R. Al Hyder, F. Chevy, and X. Leyronas, “Exploring beyond-mean-field logarithmic
divergences in Fermi-polaron energy,” Physical Review A, vol. 109, no.
3. American Physical Society, 2024.
ista: Al Hyder R, Chevy F, Leyronas X. 2024. Exploring beyond-mean-field logarithmic
divergences in Fermi-polaron energy. Physical Review A. 109(3), 033315.
mla: Al Hyder, Ragheed, et al. “Exploring Beyond-Mean-Field Logarithmic Divergences
in Fermi-Polaron Energy.” Physical Review A, vol. 109, no. 3, 033315, American
Physical Society, 2024, doi:10.1103/PhysRevA.109.033315.
short: R. Al Hyder, F. Chevy, X. Leyronas, Physical Review A 109 (2024).
date_created: 2024-03-24T23:00:59Z
date_published: 2024-03-19T00:00:00Z
date_updated: 2024-03-25T07:36:55Z
day: '19'
department:
- _id: MiLe
doi: 10.1103/PhysRevA.109.033315
external_id:
arxiv:
- '2311.14536'
intvolume: ' 109'
issue: '3'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.48550/arXiv.2311.14536
month: '03'
oa: 1
oa_version: Preprint
publication: Physical Review A
publication_identifier:
eissn:
- 2469-9934
issn:
- 2469-9926
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Exploring beyond-mean-field logarithmic divergences in Fermi-polaron energy
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 109
year: '2024'
...
---
_id: '12819'
abstract:
- lang: eng
text: 'Reaching a high cavity population with a coherent pump in the strong-coupling
regime of a single-atom laser is impossible due to the photon blockade effect.
In this Letter, we experimentally demonstrate that in a single-atom maser based
on a transmon strongly coupled to two resonators, it is possible to pump over
a dozen photons into the system. The first high-quality resonator plays the role
of a usual lasing cavity, and the second one presents a controlled dissipation
channel, bolstering population inversion, and modifies the energy-level structure
to lift the blockade. As confirmation of the lasing action, we observe conventional
laser features such as a narrowing of the emission linewidth and external signal
amplification. Additionally, we report unique single-atom features: self-quenching
and several lasing thresholds.'
acknowledgement: We thank N.N. Abramov for assistance with the experimental setup.
The sample was fabricated using equipment of MIPT Shared Facilities Center. This
research was supported by Russian Science Foundation, grant no. 21-72-30026.
article_number: L031701
article_processing_charge: No
article_type: letter_note
author:
- first_name: Alesya
full_name: Sokolova, Alesya
id: 2d0a0600-edfb-11eb-afb5-c0f5fa7f4f3a
last_name: Sokolova
orcid: 0000-0002-8308-4144
- first_name: D. A.
full_name: Kalacheva, D. A.
last_name: Kalacheva
- first_name: G. P.
full_name: Fedorov, G. P.
last_name: Fedorov
- first_name: O. V.
full_name: Astafiev, O. V.
last_name: Astafiev
citation:
ama: Sokolova A, Kalacheva DA, Fedorov GP, Astafiev OV. Overcoming photon blockade
in a circuit-QED single-atom maser with engineered metastability and strong coupling.
Physical Review A. 2023;107(3). doi:10.1103/PhysRevA.107.L031701
apa: Sokolova, A., Kalacheva, D. A., Fedorov, G. P., & Astafiev, O. V. (2023).
Overcoming photon blockade in a circuit-QED single-atom maser with engineered
metastability and strong coupling. Physical Review A. American Physical
Society. https://doi.org/10.1103/PhysRevA.107.L031701
chicago: Sokolova, Alesya, D. A. Kalacheva, G. P. Fedorov, and O. V. Astafiev. “Overcoming
Photon Blockade in a Circuit-QED Single-Atom Maser with Engineered Metastability
and Strong Coupling.” Physical Review A. American Physical Society, 2023.
https://doi.org/10.1103/PhysRevA.107.L031701.
ieee: A. Sokolova, D. A. Kalacheva, G. P. Fedorov, and O. V. Astafiev, “Overcoming
photon blockade in a circuit-QED single-atom maser with engineered metastability
and strong coupling,” Physical Review A, vol. 107, no. 3. American Physical
Society, 2023.
ista: Sokolova A, Kalacheva DA, Fedorov GP, Astafiev OV. 2023. Overcoming photon
blockade in a circuit-QED single-atom maser with engineered metastability and
strong coupling. Physical Review A. 107(3), L031701.
mla: Sokolova, Alesya, et al. “Overcoming Photon Blockade in a Circuit-QED Single-Atom
Maser with Engineered Metastability and Strong Coupling.” Physical Review A,
vol. 107, no. 3, L031701, American Physical Society, 2023, doi:10.1103/PhysRevA.107.L031701.
short: A. Sokolova, D.A. Kalacheva, G.P. Fedorov, O.V. Astafiev, Physical Review
A 107 (2023).
date_created: 2023-04-09T22:01:00Z
date_published: 2023-03-22T00:00:00Z
date_updated: 2023-08-01T14:06:05Z
day: '22'
department:
- _id: JoFi
doi: 10.1103/PhysRevA.107.L031701
external_id:
arxiv:
- '2209.05165'
isi:
- '000957799000006'
intvolume: ' 107'
isi: 1
issue: '3'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.48550/arXiv.2209.05165
month: '03'
oa: 1
oa_version: Preprint
publication: Physical Review A
publication_identifier:
eissn:
- 2469-9934
issn:
- 2469-9926
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Overcoming photon blockade in a circuit-QED single-atom maser with engineered
metastability and strong coupling
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 107
year: '2023'
...
---
_id: '12914'
abstract:
- lang: eng
text: We numerically study two methods of measuring tunneling times using a quantum
clock. In the conventional method using the Larmor clock, we show that the Larmor
tunneling time can be shorter for higher tunneling barriers. In the second method,
we study the probability of a spin-flip of a particle when it is transmitted through
a potential barrier including a spatially rotating field interacting with its
spin. According to the adiabatic theorem, the probability depends on the velocity
of the particle inside the barrier. It is numerically observed that the probability
increases for higher barriers, which is consistent with the result obtained by
the Larmor clock. By comparing outcomes for different initial spin states, we
suggest that one of the main causes of the apparent decrease in the tunneling
time can be the filtering effect occurring at the end of the barrier.
acknowledgement: We thank W. H. Zurek, N. Sinitsyn, M. O. Scully, M. Arndt, and C.
H. Marrows for helpful discussions. F.S. acknowledges support from the Los Alamos
National Laboratory LDRD program under Project No. 20230049DR and the Center for
Nonlinear Studies. F.S. also thanks the European Union’s Horizon 2020 research and
innovation program under the Marie Skłodowska-Curie Grant No. 754411 for support.
W.G.U. thanks the Natural Science and Engineering Research Council of Canada, the
Hagler Institute of Texas A&M University, the Helmholz Inst HZDR, Germany for support
while this work was being done.
article_number: '042216'
article_processing_charge: No
article_type: original
author:
- first_name: Fumika
full_name: Suzuki, Fumika
id: 650C99FC-1079-11EA-A3C0-73AE3DDC885E
last_name: Suzuki
orcid: 0000-0003-4982-5970
- first_name: William G.
full_name: Unruh, William G.
last_name: Unruh
citation:
ama: Suzuki F, Unruh WG. Numerical quantum clock simulations for measuring tunneling
times. Physical Review A. 2023;107(4). doi:10.1103/PhysRevA.107.042216
apa: Suzuki, F., & Unruh, W. G. (2023). Numerical quantum clock simulations
for measuring tunneling times. Physical Review A. American Physical Society.
https://doi.org/10.1103/PhysRevA.107.042216
chicago: Suzuki, Fumika, and William G. Unruh. “Numerical Quantum Clock Simulations
for Measuring Tunneling Times.” Physical Review A. American Physical Society,
2023. https://doi.org/10.1103/PhysRevA.107.042216.
ieee: F. Suzuki and W. G. Unruh, “Numerical quantum clock simulations for measuring
tunneling times,” Physical Review A, vol. 107, no. 4. American Physical
Society, 2023.
ista: Suzuki F, Unruh WG. 2023. Numerical quantum clock simulations for measuring
tunneling times. Physical Review A. 107(4), 042216.
mla: Suzuki, Fumika, and William G. Unruh. “Numerical Quantum Clock Simulations
for Measuring Tunneling Times.” Physical Review A, vol. 107, no. 4, 042216,
American Physical Society, 2023, doi:10.1103/PhysRevA.107.042216.
short: F. Suzuki, W.G. Unruh, Physical Review A 107 (2023).
date_created: 2023-05-07T22:01:03Z
date_published: 2023-04-20T00:00:00Z
date_updated: 2023-08-01T14:33:21Z
day: '20'
department:
- _id: MiLe
doi: 10.1103/PhysRevA.107.042216
ec_funded: 1
external_id:
arxiv:
- '2207.13130'
isi:
- '000975799300006'
intvolume: ' 107'
isi: 1
issue: '4'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.48550/arXiv.2207.13130
month: '04'
oa: 1
oa_version: Preprint
project:
- _id: 260C2330-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '754411'
name: ISTplus - Postdoctoral Fellowships
publication: Physical Review A
publication_identifier:
eissn:
- 2469-9934
issn:
- 2469-9926
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Numerical quantum clock simulations for measuring tunneling times
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 107
year: '2023'
...
---
_id: '13233'
abstract:
- lang: eng
text: We study the impact of finite-range physics on the zero-range-model analysis
of three-body recombination in ultracold atoms. We find that temperature dependence
of the zero-range parameters can vary from one set of measurements to another
as it may be driven by the distribution of error bars in the experiment, and not
by the underlying three-body physics. To study finite-temperature effects in three-body
recombination beyond the zero-range physics, we introduce and examine a finite-range
model based upon a hyperspherical formalism. The systematic error discussed in
this Letter may provide a significant contribution to the error bars of measured
three-body parameters.
acknowledgement: We thank Jan Arlt, Hans-Werner Hammer, and Karsten Riisager for useful
discussions. M.L. acknowledges support by the European Research Council (ERC) Starting
Grant No. 801770 (ANGULON).
article_number: L061304
article_processing_charge: No
article_type: letter_note
author:
- first_name: Sofya
full_name: Agafonova, Sofya
id: 09501ff6-dca7-11ea-a8ae-b3e0b9166e80
last_name: Agafonova
- first_name: Mikhail
full_name: Lemeshko, Mikhail
id: 37CB05FA-F248-11E8-B48F-1D18A9856A87
last_name: Lemeshko
orcid: 0000-0002-6990-7802
- first_name: Artem
full_name: Volosniev, Artem
id: 37D278BC-F248-11E8-B48F-1D18A9856A87
last_name: Volosniev
orcid: 0000-0003-0393-5525
citation:
ama: Agafonova S, Lemeshko M, Volosniev A. Finite-range bias in fitting three-body
loss to the zero-range model. Physical Review A. 2023;107(6). doi:10.1103/PhysRevA.107.L061304
apa: Agafonova, S., Lemeshko, M., & Volosniev, A. (2023). Finite-range bias
in fitting three-body loss to the zero-range model. Physical Review A.
American Physical Society. https://doi.org/10.1103/PhysRevA.107.L061304
chicago: Agafonova, Sofya, Mikhail Lemeshko, and Artem Volosniev. “Finite-Range
Bias in Fitting Three-Body Loss to the Zero-Range Model.” Physical Review A.
American Physical Society, 2023. https://doi.org/10.1103/PhysRevA.107.L061304.
ieee: S. Agafonova, M. Lemeshko, and A. Volosniev, “Finite-range bias in fitting
three-body loss to the zero-range model,” Physical Review A, vol. 107,
no. 6. American Physical Society, 2023.
ista: Agafonova S, Lemeshko M, Volosniev A. 2023. Finite-range bias in fitting three-body
loss to the zero-range model. Physical Review A. 107(6), L061304.
mla: Agafonova, Sofya, et al. “Finite-Range Bias in Fitting Three-Body Loss to the
Zero-Range Model.” Physical Review A, vol. 107, no. 6, L061304, American
Physical Society, 2023, doi:10.1103/PhysRevA.107.L061304.
short: S. Agafonova, M. Lemeshko, A. Volosniev, Physical Review A 107 (2023).
date_created: 2023-07-16T22:01:10Z
date_published: 2023-06-20T00:00:00Z
date_updated: 2023-08-02T06:31:52Z
day: '20'
department:
- _id: MiLe
- _id: OnHo
doi: 10.1103/PhysRevA.107.L061304
ec_funded: 1
external_id:
arxiv:
- '2302.01022'
isi:
- '001019748000005'
intvolume: ' 107'
isi: 1
issue: '6'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.48550/arXiv.2302.01022
month: '06'
oa: 1
oa_version: Preprint
project:
- _id: 2688CF98-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '801770'
name: 'Angulon: physics and applications of a new quasiparticle'
publication: Physical Review A
publication_identifier:
eissn:
- 2469-9934
issn:
- 2469-9926
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Finite-range bias in fitting three-body loss to the zero-range model
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 107
year: '2023'
...
---
_id: '14553'
abstract:
- lang: eng
text: Quantum state tomography is an essential component of modern quantum technology.
In application to continuous-variable harmonic-oscillator systems, such as the
electromagnetic field, existing tomography methods typically reconstruct the state
in discrete bases, and are hence limited to states with relatively low amplitudes
and energies. Here, we overcome this limitation by utilizing a feed-forward neural
network to obtain the density matrix directly in the continuous position basis.
An important benefit of our approach is the ability to choose specific regions
in the phase space for detailed reconstruction. This results in a relatively slow
scaling of the amount of resources required for the reconstruction with the state
amplitude, and hence allows us to dramatically increase the range of amplitudes
accessible with our method.
article_number: '042430'
article_processing_charge: No
article_type: original
author:
- first_name: Ekaterina
full_name: Fedotova, Ekaterina
id: c1bea5e1-878e-11ee-9dff-d7404e4422ab
last_name: Fedotova
orcid: 0000-0001-7242-015X
- first_name: Nikolai
full_name: Kuznetsov, Nikolai
last_name: Kuznetsov
- first_name: Egor
full_name: Tiunov, Egor
last_name: Tiunov
- first_name: A. E.
full_name: Ulanov, A. E.
last_name: Ulanov
- first_name: A. I.
full_name: Lvovsky, A. I.
last_name: Lvovsky
citation:
ama: Fedotova E, Kuznetsov N, Tiunov E, Ulanov AE, Lvovsky AI. Continuous-variable
quantum tomography of high-amplitude states. Physical Review A. 2023;108(4).
doi:10.1103/PhysRevA.108.042430
apa: Fedotova, E., Kuznetsov, N., Tiunov, E., Ulanov, A. E., & Lvovsky, A. I.
(2023). Continuous-variable quantum tomography of high-amplitude states. Physical
Review A. American Physical Society. https://doi.org/10.1103/PhysRevA.108.042430
chicago: Fedotova, Ekaterina, Nikolai Kuznetsov, Egor Tiunov, A. E. Ulanov, and
A. I. Lvovsky. “Continuous-Variable Quantum Tomography of High-Amplitude States.”
Physical Review A. American Physical Society, 2023. https://doi.org/10.1103/PhysRevA.108.042430.
ieee: E. Fedotova, N. Kuznetsov, E. Tiunov, A. E. Ulanov, and A. I. Lvovsky, “Continuous-variable
quantum tomography of high-amplitude states,” Physical Review A, vol. 108,
no. 4. American Physical Society, 2023.
ista: Fedotova E, Kuznetsov N, Tiunov E, Ulanov AE, Lvovsky AI. 2023. Continuous-variable
quantum tomography of high-amplitude states. Physical Review A. 108(4), 042430.
mla: Fedotova, Ekaterina, et al. “Continuous-Variable Quantum Tomography of High-Amplitude
States.” Physical Review A, vol. 108, no. 4, 042430, American Physical
Society, 2023, doi:10.1103/PhysRevA.108.042430.
short: E. Fedotova, N. Kuznetsov, E. Tiunov, A.E. Ulanov, A.I. Lvovsky, Physical
Review A 108 (2023).
date_created: 2023-11-19T23:00:54Z
date_published: 2023-10-30T00:00:00Z
date_updated: 2023-11-20T10:26:51Z
day: '30'
department:
- _id: JoFi
doi: 10.1103/PhysRevA.108.042430
external_id:
arxiv:
- '2212.07406'
intvolume: ' 108'
issue: '4'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.48550/arXiv.2212.07406
month: '10'
oa: 1
oa_version: Preprint
publication: Physical Review A
publication_identifier:
eissn:
- 2469-9934
issn:
- 2469-9926
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Continuous-variable quantum tomography of high-amplitude states
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 108
year: '2023'
...
---
_id: '13125'
abstract:
- lang: eng
text: 'The quantum approximate optimization algorithm (QAOA) is a variational quantum
algorithm, where a quantum computer implements a variational ansatz consisting
of p layers of alternating unitary operators and a classical computer is used
to optimize the variational parameters. For a random initialization, the optimization
typically leads to local minima with poor performance, motivating the search for
initialization strategies of QAOA variational parameters. Although numerous heuristic
initializations exist, an analytical understanding and performance guarantees
for large p remain evasive.We introduce a greedy initialization of QAOA which
guarantees improving performance with an increasing number of layers. Our main
result is an analytic construction of 2p + 1 transition states—saddle points with
a unique negative curvature direction—for QAOA with p + 1 layers that use the
local minimum of QAOA with p layers. Transition states connect to new local minima,
which are guaranteed to lower the energy compared to the minimum found for p layers.
We use the GREEDY procedure to navigate the exponentially increasing with p number
of local minima resulting from the recursive application of our analytic construction.
The performance of the GREEDY procedure matches available initialization strategies
while providing a guarantee for the minimal energy to decrease with an increasing
number of layers p. '
acknowledgement: 'We thank V. Verteletskyi for a joint collaboration on numerical
studies of the QAOA during his internship at ISTA that inspired analytic results
on TS reported in this work. We acknowledge A. A. Mele and M. Brooks for discussions
and D. Egger, P. Love, and D. Wierichs for valuable feedback on the manuscript.
S.H.S., R.A.M., and M.S. acknowledge support by the European Research Council (ERC)
under the European Union’s Horizon 2020 research and innovation program (Grant Agreement
No. 850899). R.K. is supported by the SFB BeyondC (Grant No. F7107-N38) and the
project QuantumReady (FFG 896217). '
article_number: '062404'
article_processing_charge: No
article_type: original
author:
- first_name: Stefan
full_name: Sack, Stefan
id: dd622248-f6e0-11ea-865d-ce382a1c81a5
last_name: Sack
orcid: 0000-0001-5400-8508
- first_name: Raimel A
full_name: Medina Ramos, Raimel A
id: CE680B90-D85A-11E9-B684-C920E6697425
last_name: Medina Ramos
orcid: 0000-0002-5383-2869
- first_name: Richard
full_name: Kueng, Richard
last_name: Kueng
- first_name: Maksym
full_name: Serbyn, Maksym
id: 47809E7E-F248-11E8-B48F-1D18A9856A87
last_name: Serbyn
orcid: 0000-0002-2399-5827
citation:
ama: Sack S, Medina Ramos RA, Kueng R, Serbyn M. Recursive greedy initialization
of the quantum approximate optimization algorithm with guaranteed improvement.
Physical Review A. 2023;107(6). doi:10.1103/physreva.107.062404
apa: Sack, S., Medina Ramos, R. A., Kueng, R., & Serbyn, M. (2023). Recursive
greedy initialization of the quantum approximate optimization algorithm with guaranteed
improvement. Physical Review A. American Physical Society. https://doi.org/10.1103/physreva.107.062404
chicago: Sack, Stefan, Raimel A Medina Ramos, Richard Kueng, and Maksym Serbyn.
“Recursive Greedy Initialization of the Quantum Approximate Optimization Algorithm
with Guaranteed Improvement.” Physical Review A. American Physical Society,
2023. https://doi.org/10.1103/physreva.107.062404.
ieee: S. Sack, R. A. Medina Ramos, R. Kueng, and M. Serbyn, “Recursive greedy initialization
of the quantum approximate optimization algorithm with guaranteed improvement,”
Physical Review A, vol. 107, no. 6. American Physical Society, 2023.
ista: Sack S, Medina Ramos RA, Kueng R, Serbyn M. 2023. Recursive greedy initialization
of the quantum approximate optimization algorithm with guaranteed improvement.
Physical Review A. 107(6), 062404.
mla: Sack, Stefan, et al. “Recursive Greedy Initialization of the Quantum Approximate
Optimization Algorithm with Guaranteed Improvement.” Physical Review A,
vol. 107, no. 6, 062404, American Physical Society, 2023, doi:10.1103/physreva.107.062404.
short: S. Sack, R.A. Medina Ramos, R. Kueng, M. Serbyn, Physical Review A 107 (2023).
date_created: 2023-06-07T06:57:32Z
date_published: 2023-06-02T00:00:00Z
date_updated: 2023-12-13T14:47:25Z
day: '02'
ddc:
- '530'
department:
- _id: MaSe
doi: 10.1103/physreva.107.062404
ec_funded: 1
external_id:
arxiv:
- '2209.01159'
isi:
- '001016927100012'
file:
- access_level: open_access
checksum: 0d71423888eeccaa60d8f41197f26306
content_type: application/pdf
creator: dernst
date_created: 2023-06-13T07:28:36Z
date_updated: 2023-06-13T07:28:36Z
file_id: '13131'
file_name: 2023_PhysRevA_Sack.pdf
file_size: 2524611
relation: main_file
success: 1
file_date_updated: 2023-06-13T07:28:36Z
has_accepted_license: '1'
intvolume: ' 107'
isi: 1
issue: '6'
language:
- iso: eng
license: https://creativecommons.org/licenses/by/4.0/
month: '06'
oa: 1
oa_version: Published Version
project:
- _id: 23841C26-32DE-11EA-91FC-C7463DDC885E
call_identifier: H2020
grant_number: '850899'
name: 'Non-Ergodic Quantum Matter: Universality, Dynamics and Control'
publication: Physical Review A
publication_identifier:
eissn:
- 2469-9934
issn:
- 2469-9926
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
related_material:
record:
- id: '14622'
relation: dissertation_contains
status: public
scopus_import: '1'
status: public
title: Recursive greedy initialization of the quantum approximate optimization algorithm
with guaranteed improvement
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: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 107
year: '2023'
...
---
_id: '11591'
abstract:
- lang: eng
text: We investigate the deterministic generation and distribution of entanglement
in large quantum networks by driving distant qubits with the output fields of
a nondegenerate parametric amplifier. In this setting, the amplifier produces
a continuous Gaussian two-mode squeezed state, which acts as a quantum-correlated
reservoir for the qubits and relaxes them into a highly entangled steady state.
Here we are interested in the maximal amount of entanglement and the optimal entanglement
generation rates that can be achieved with this scheme under realistic conditions
taking, in particular, the finite amplifier bandwidth, waveguide losses, and propagation
delays into account. By combining exact numerical simulations of the full network
with approximate analytic results, we predict the optimal working point for the
amplifier and the corresponding qubit-qubit entanglement under various conditions.
Our findings show that this passive conversion of Gaussian into discrete-variable
entanglement offers a robust and experimentally very attractive approach for operating
large optical, microwave, or hybrid quantum networks, for which efficient parametric
amplifiers are currently developed.
acknowledgement: We thank T. Mavrogordatos and D. Zhu for initial contribution on
the presented topic and K. Fedorov for stimulating discussions on entangled microwave
beams. This work was supported by the Austrian Science Fund (FWF) through Grant
No. P32299 (PHONED) and the European Union’s Horizon 2020 research and innovation
programme under Grant Agreement No. 899354 (SuperQuLAN). Most of the computational
results presented were obtained using the CLIP cluster [65].
article_number: '062454'
article_processing_charge: No
article_type: original
author:
- first_name: J.
full_name: Agustí, J.
last_name: Agustí
- first_name: Y.
full_name: Minoguchi, Y.
last_name: Minoguchi
- 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: P.
full_name: Rabl, P.
last_name: Rabl
citation:
ama: Agustí J, Minoguchi Y, Fink JM, Rabl P. Long-distance distribution of qubit-qubit
entanglement using Gaussian-correlated photonic beams. Physical Review A.
2022;105(6). doi:10.1103/PhysRevA.105.062454
apa: Agustí, J., Minoguchi, Y., Fink, J. M., & Rabl, P. (2022). Long-distance
distribution of qubit-qubit entanglement using Gaussian-correlated photonic beams.
Physical Review A. American Physical Society. https://doi.org/10.1103/PhysRevA.105.062454
chicago: Agustí, J., Y. Minoguchi, Johannes M Fink, and P. Rabl. “Long-Distance
Distribution of Qubit-Qubit Entanglement Using Gaussian-Correlated Photonic Beams.”
Physical Review A. American Physical Society, 2022. https://doi.org/10.1103/PhysRevA.105.062454.
ieee: J. Agustí, Y. Minoguchi, J. M. Fink, and P. Rabl, “Long-distance distribution
of qubit-qubit entanglement using Gaussian-correlated photonic beams,” Physical
Review A, vol. 105, no. 6. American Physical Society, 2022.
ista: Agustí J, Minoguchi Y, Fink JM, Rabl P. 2022. Long-distance distribution of
qubit-qubit entanglement using Gaussian-correlated photonic beams. Physical Review
A. 105(6), 062454.
mla: Agustí, J., et al. “Long-Distance Distribution of Qubit-Qubit Entanglement
Using Gaussian-Correlated Photonic Beams.” Physical Review A, vol. 105,
no. 6, 062454, American Physical Society, 2022, doi:10.1103/PhysRevA.105.062454.
short: J. Agustí, Y. Minoguchi, J.M. Fink, P. Rabl, Physical Review A 105 (2022).
date_created: 2022-07-17T22:01:55Z
date_published: 2022-06-29T00:00:00Z
date_updated: 2023-08-03T11:58:16Z
day: '29'
department:
- _id: JoFi
doi: 10.1103/PhysRevA.105.062454
ec_funded: 1
external_id:
arxiv:
- '2204.02993'
isi:
- '000824330200003'
intvolume: ' 105'
isi: 1
issue: '6'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: ' https://doi.org/10.48550/arXiv.2204.02993'
month: '06'
oa: 1
oa_version: Preprint
project:
- _id: 9B868D20-BA93-11EA-9121-9846C619BF3A
call_identifier: H2020
grant_number: '899354'
name: Quantum Local Area Networks with Superconducting Qubits
publication: Physical Review A
publication_identifier:
eissn:
- 2469-9934
issn:
- 2469-9926
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Long-distance distribution of qubit-qubit entanglement using Gaussian-correlated
photonic beams
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 105
year: '2022'
...
---
_id: '11592'
abstract:
- lang: eng
text: 'We compare recent experimental results [Science 375, 528 (2022)] of the superfluid
unitary Fermi gas near the critical temperature with a thermodynamic model based
on the elementary excitations of the system. We find good agreement between experimental
data and our theory for several quantities such as first sound, second sound,
and superfluid fraction. We also show that mode mixing between first and second
sound occurs. Finally, we characterize the response amplitude to a density perturbation:
Close to the critical temperature both first and second sound can be excited through
a density perturbation, whereas at lower temperatures only the first sound mode
exhibits a significant response.'
acknowledgement: The authors gratefully acknowledge stimulating discussions with T.
Enss, and thank an anonymous referee for suggestions and remarks that allowed us
to improve the original manuscript. This work is supported by the Deutsche Forschungsgemeinschaft
(DFG, German Research Foundation) under Germany’s Excellence Strategy EXC2181/1-390900948
(the Heidelberg STRUCTURES Excellence Cluster).
article_number: '063329'
article_processing_charge: No
article_type: original
author:
- first_name: Giacomo
full_name: Bighin, Giacomo
id: 4CA96FD4-F248-11E8-B48F-1D18A9856A87
last_name: Bighin
orcid: 0000-0001-8823-9777
- first_name: Alberto
full_name: Cappellaro, Alberto
id: 9d13b3cb-30a2-11eb-80dc-f772505e8660
last_name: Cappellaro
orcid: 0000-0001-6110-2359
- first_name: L.
full_name: Salasnich, L.
last_name: Salasnich
citation:
ama: 'Bighin G, Cappellaro A, Salasnich L. Unitary Fermi superfluid near the critical
temperature: Thermodynamics and sound modes from elementary excitations. Physical
Review A. 2022;105(6). doi:10.1103/PhysRevA.105.063329'
apa: 'Bighin, G., Cappellaro, A., & Salasnich, L. (2022). Unitary Fermi superfluid
near the critical temperature: Thermodynamics and sound modes from elementary
excitations. Physical Review A. American Physical Society. https://doi.org/10.1103/PhysRevA.105.063329'
chicago: 'Bighin, Giacomo, Alberto Cappellaro, and L. Salasnich. “Unitary Fermi
Superfluid near the Critical Temperature: Thermodynamics and Sound Modes from
Elementary Excitations.” Physical Review A. American Physical Society,
2022. https://doi.org/10.1103/PhysRevA.105.063329.'
ieee: 'G. Bighin, A. Cappellaro, and L. Salasnich, “Unitary Fermi superfluid near
the critical temperature: Thermodynamics and sound modes from elementary excitations,”
Physical Review A, vol. 105, no. 6. American Physical Society, 2022.'
ista: 'Bighin G, Cappellaro A, Salasnich L. 2022. Unitary Fermi superfluid near
the critical temperature: Thermodynamics and sound modes from elementary excitations.
Physical Review A. 105(6), 063329.'
mla: 'Bighin, Giacomo, et al. “Unitary Fermi Superfluid near the Critical Temperature:
Thermodynamics and Sound Modes from Elementary Excitations.” Physical Review
A, vol. 105, no. 6, 063329, American Physical Society, 2022, doi:10.1103/PhysRevA.105.063329.'
short: G. Bighin, A. Cappellaro, L. Salasnich, Physical Review A 105 (2022).
date_created: 2022-07-17T22:01:55Z
date_published: 2022-06-30T00:00:00Z
date_updated: 2023-08-03T12:00:11Z
day: '30'
department:
- _id: MiLe
doi: 10.1103/PhysRevA.105.063329
external_id:
arxiv:
- '2206.03924'
isi:
- '000829758500010'
intvolume: ' 105'
isi: 1
issue: '6'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: ' https://doi.org/10.48550/arXiv.2206.03924'
month: '06'
oa: 1
oa_version: Preprint
publication: Physical Review A
publication_identifier:
eissn:
- 2469-9934
issn:
- 2469-9926
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'Unitary Fermi superfluid near the critical temperature: Thermodynamics and
sound modes from elementary excitations'
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 105
year: '2022'
...
---
_id: '11997'
abstract:
- lang: eng
text: "We study the fate of an impurity in an ultracold heteronuclear Bose mixture,
focusing on the experimentally relevant case of a ⁴¹K - ⁸⁷Rb mixture, with the
impurity in a ⁴¹K hyperfine state. Our paper provides a comprehensive description
of an impurity in a BEC mixture with contact interactions across its phase diagram.
We present results for the miscible and immiscible regimes, as well as for the
impurity in a self-bound quantum droplet. Here, varying the interactions, we find
exotic states where the impurity localizes either at the center or\r\nat the surface
of the droplet. "
acknowledgement: We thank A. Simoni for providing the calculations of the intercomponent
scattering lengths. We gratefully acknowledge stimulating discussions with L. A.
Peña Ardila, R. Schmidt, H. Silva, V. Zampronio, and M. Prevedelli for careful reading.
G.B. acknowledges support from the Austrian Science Fund (FWF) under Project No.
M2641-N27. T.M. acknowledges CNPq for support through Bolsa de produtividade em
Pesquisa No. 311079/2015-6. This work is supported by the Deutsche Forschungsgemeinschaft
(DFG, German Research Foundation) under Germany's Excellence Strategy No. EXC2181/1-390900948
(the Heidelberg STRUCTURES Excellence Cluster). This work was supported by the Serrapilheira
Institute (Grant No. Serra-1812-27802). We thank the High-Performance Computing
Center (NPAD) at UFRN for providing computational resources.
article_number: '023301'
article_processing_charge: No
article_type: original
author:
- first_name: Giacomo
full_name: Bighin, Giacomo
id: 4CA96FD4-F248-11E8-B48F-1D18A9856A87
last_name: Bighin
orcid: 0000-0001-8823-9777
- first_name: A.
full_name: Burchianti, A.
last_name: Burchianti
- first_name: F.
full_name: Minardi, F.
last_name: Minardi
- first_name: T.
full_name: Macrì, T.
last_name: Macrì
citation:
ama: Bighin G, Burchianti A, Minardi F, Macrì T. Impurity in a heteronuclear two-component
Bose mixture. Physical Review A. 2022;106(2). doi:10.1103/PhysRevA.106.023301
apa: Bighin, G., Burchianti, A., Minardi, F., & Macrì, T. (2022). Impurity in
a heteronuclear two-component Bose mixture. Physical Review A. American
Physical Society. https://doi.org/10.1103/PhysRevA.106.023301
chicago: Bighin, Giacomo, A. Burchianti, F. Minardi, and T. Macrì. “Impurity in
a Heteronuclear Two-Component Bose Mixture.” Physical Review A. American
Physical Society, 2022. https://doi.org/10.1103/PhysRevA.106.023301.
ieee: G. Bighin, A. Burchianti, F. Minardi, and T. Macrì, “Impurity in a heteronuclear
two-component Bose mixture,” Physical Review A, vol. 106, no. 2. American
Physical Society, 2022.
ista: Bighin G, Burchianti A, Minardi F, Macrì T. 2022. Impurity in a heteronuclear
two-component Bose mixture. Physical Review A. 106(2), 023301.
mla: Bighin, Giacomo, et al. “Impurity in a Heteronuclear Two-Component Bose Mixture.”
Physical Review A, vol. 106, no. 2, 023301, American Physical Society,
2022, doi:10.1103/PhysRevA.106.023301.
short: G. Bighin, A. Burchianti, F. Minardi, T. Macrì, Physical Review A 106 (2022).
date_created: 2022-08-28T22:02:00Z
date_published: 2022-08-04T00:00:00Z
date_updated: 2023-08-03T13:20:42Z
day: '04'
department:
- _id: MiLe
doi: 10.1103/PhysRevA.106.023301
external_id:
arxiv:
- '2109.07451'
isi:
- '000837953600006'
intvolume: ' 106'
isi: 1
issue: '2'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.48550/arXiv.2109.07451
month: '08'
oa: 1
oa_version: Preprint
project:
- _id: 26986C82-B435-11E9-9278-68D0E5697425
call_identifier: FWF
grant_number: M02641
name: A path-integral approach to composite impurities
publication: Physical Review A
publication_identifier:
eissn:
- 2469-9934
issn:
- 2469-9926
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Impurity in a heteronuclear two-component Bose mixture
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 106
year: '2022'
...
---
_id: '9242'
abstract:
- lang: eng
text: In the recent years important experimental advances in resonant electro-optic
modulators as high-efficiency sources for coherent frequency combs and as devices
for quantum information transfer have been realized, where strong optical and
microwave mode coupling were achieved. These features suggest electro-optic-based
devices as candidates for entangled optical frequency comb sources. In the present
work, I study the generation of entangled optical frequency combs in millimeter-sized
resonant electro-optic modulators. These devices profit from the experimentally
proven advantages such as nearly constant optical free spectral ranges over several
gigahertz, and high optical and microwave quality factors. The generation of frequency
multiplexed quantum channels with spectral bandwidth in the MHz range for conservative
parameter values paves the way towards novel uses in long-distance hybrid quantum
networks, quantum key distribution, enhanced optical metrology, and quantum computing.
acknowledgement: "I thank Prof. Shabir Barzanjeh and Dr. Ulrich Vogl for the fruitful
discussions.\r\n"
article_number: '023708'
article_processing_charge: No
article_type: original
author:
- first_name: Alfredo R
full_name: Rueda Sanchez, Alfredo R
id: 3B82B0F8-F248-11E8-B48F-1D18A9856A87
last_name: Rueda Sanchez
orcid: 0000-0001-6249-5860
citation:
ama: Rueda Sanchez AR. Frequency-multiplexed hybrid optical entangled source based
on the Pockels effect. Physical Review A. 2021;103(2). doi:10.1103/PhysRevA.103.023708
apa: Rueda Sanchez, A. R. (2021). Frequency-multiplexed hybrid optical entangled
source based on the Pockels effect. Physical Review A. American Physical
Society. https://doi.org/10.1103/PhysRevA.103.023708
chicago: Rueda Sanchez, Alfredo R. “Frequency-Multiplexed Hybrid Optical Entangled
Source Based on the Pockels Effect.” Physical Review A. American Physical
Society, 2021. https://doi.org/10.1103/PhysRevA.103.023708.
ieee: A. R. Rueda Sanchez, “Frequency-multiplexed hybrid optical entangled source
based on the Pockels effect,” Physical Review A, vol. 103, no. 2. American
Physical Society, 2021.
ista: Rueda Sanchez AR. 2021. Frequency-multiplexed hybrid optical entangled source
based on the Pockels effect. Physical Review A. 103(2), 023708.
mla: Rueda Sanchez, Alfredo R. “Frequency-Multiplexed Hybrid Optical Entangled Source
Based on the Pockels Effect.” Physical Review A, vol. 103, no. 2, 023708,
American Physical Society, 2021, doi:10.1103/PhysRevA.103.023708.
short: A.R. Rueda Sanchez, Physical Review A 103 (2021).
date_created: 2021-03-14T23:01:33Z
date_published: 2021-02-11T00:00:00Z
date_updated: 2023-08-07T14:11:18Z
day: '11'
department:
- _id: JoFi
doi: 10.1103/PhysRevA.103.023708
external_id:
arxiv:
- '2010.05356'
isi:
- '000617037900013'
intvolume: ' 103'
isi: 1
issue: '2'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/2010.05356
month: '02'
oa: 1
oa_version: Preprint
publication: Physical Review A
publication_identifier:
eissn:
- 2469-9934
issn:
- 2469-9926
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Frequency-multiplexed hybrid optical entangled source based on the Pockels
effect
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 103
year: '2021'
...
---
_id: '10545'
abstract:
- lang: eng
text: Classical models with complex energy landscapes represent a perspective avenue
for the near-term application of quantum simulators. Until now, many theoretical
works studied the performance of quantum algorithms for models with a unique ground
state. However, when the classical problem is in a so-called clustering phase,
the ground state manifold is highly degenerate. As an example, we consider a 3-XORSAT
model defined on simple hypergraphs. The degeneracy of classical ground state
manifold translates into the emergence of an extensive number of Z2 symmetries,
which remain intact even in the presence of a quantum transverse magnetic field.
We establish a general duality approach that restricts the quantum problem to
a given sector of conserved Z2 charges and use it to study how the outcome of
the quantum adiabatic algorithm depends on the hypergraph geometry. We show that
the tree hypergraph which corresponds to a classically solvable instance of the
3-XORSAT problem features a constant gap, whereas the closed hypergraph encounters
a second-order phase transition with a gap vanishing as a power-law in the problem
size. The duality developed in this work provides a practical tool for studies
of quantum models with classically degenerate energy manifold and reveals potential
connections between glasses and gauge theories.
acknowledgement: We would like to thank S. De Nicola, A. Michaidilis, T. Gulden, Y.
Nez-Fernndez, P. Brighi, and S. Sack for fruitful discussions and valuable feedback
on the manuscript. M.S. acknowledges useful discussions with E. Altman, L. Cugliandolo,
and C. Laumann. We acknowledge support from the European Research Council (ERC)
under the European Union's Horizon 2020 Research and Innovation Programme Grant
Agreement No. 850899.
article_number: '062423'
article_processing_charge: No
article_type: original
author:
- first_name: Raimel A
full_name: Medina Ramos, Raimel A
id: CE680B90-D85A-11E9-B684-C920E6697425
last_name: Medina Ramos
orcid: 0000-0002-5383-2869
- first_name: Maksym
full_name: Serbyn, Maksym
id: 47809E7E-F248-11E8-B48F-1D18A9856A87
last_name: Serbyn
orcid: 0000-0002-2399-5827
citation:
ama: Medina Ramos RA, Serbyn M. Duality approach to quantum annealing of the 3-variable
exclusive-or satisfiability problem (3-XORSAT). Physical Review A. 2021;104(6).
doi:10.1103/physreva.104.062423
apa: Medina Ramos, R. A., & Serbyn, M. (2021). Duality approach to quantum annealing
of the 3-variable exclusive-or satisfiability problem (3-XORSAT). Physical
Review A. American Physical Society. https://doi.org/10.1103/physreva.104.062423
chicago: Medina Ramos, Raimel A, and Maksym Serbyn. “Duality Approach to Quantum
Annealing of the 3-Variable Exclusive-or Satisfiability Problem (3-XORSAT).” Physical
Review A. American Physical Society, 2021. https://doi.org/10.1103/physreva.104.062423.
ieee: R. A. Medina Ramos and M. Serbyn, “Duality approach to quantum annealing of
the 3-variable exclusive-or satisfiability problem (3-XORSAT),” Physical Review
A, vol. 104, no. 6. American Physical Society, 2021.
ista: Medina Ramos RA, Serbyn M. 2021. Duality approach to quantum annealing of
the 3-variable exclusive-or satisfiability problem (3-XORSAT). Physical Review
A. 104(6), 062423.
mla: Medina Ramos, Raimel A., and Maksym Serbyn. “Duality Approach to Quantum Annealing
of the 3-Variable Exclusive-or Satisfiability Problem (3-XORSAT).” Physical
Review A, vol. 104, no. 6, 062423, American Physical Society, 2021, doi:10.1103/physreva.104.062423.
short: R.A. Medina Ramos, M. Serbyn, Physical Review A 104 (2021).
date_created: 2021-12-14T20:46:07Z
date_published: 2021-12-14T00:00:00Z
date_updated: 2023-08-17T06:22:49Z
day: '14'
department:
- _id: MaSe
doi: 10.1103/physreva.104.062423
ec_funded: 1
external_id:
arxiv:
- '2106.06344'
isi:
- '000753659200004'
intvolume: ' 104'
isi: 1
issue: '6'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/2106.06344
month: '12'
oa: 1
oa_version: Preprint
project:
- _id: 23841C26-32DE-11EA-91FC-C7463DDC885E
call_identifier: H2020
grant_number: '850899'
name: 'Non-Ergodic Quantum Matter: Universality, Dynamics and Control'
publication: Physical Review A
publication_identifier:
eissn:
- 2469-9934
issn:
- 2469-9926
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
status: public
title: Duality approach to quantum annealing of the 3-variable exclusive-or satisfiability
problem (3-XORSAT)
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 104
year: '2021'
...
---
_id: '10631'
abstract:
- lang: eng
text: We combine experimental and theoretical approaches to explore excited rotational
states of molecules embedded in helium nanodroplets using CS2 and I2 as examples.
Laser-induced nonadiabatic molecular alignment is employed to measure spectral
lines for rotational states extending beyond those initially populated at the
0.37 K droplet temperature. We construct a simple quantum-mechanical model, based
on a linear rotor coupled to a single-mode bosonic bath, to determine the rotational
energy structure in its entirety. The calculated and measured spectral lines are
in good agreement. We show that the effect of the surrounding superfluid on molecular
rotation can be rationalized by a single quantity, the angular momentum, transferred
from the molecule to the droplet.
acknowledgement: I.C. acknowledges the support by the European Union’s Horizon 2020
research and innovation programme under the Marie Sklodowska-Curie Grant Agreement
No. 665385. G.B. acknowledges support from the Austrian Science Fund (FWF), under
project No. M2461-N27. M.L. acknowledges support by the Austrian Science Fund (FWF),
under project No. P29902-N27, and by the European Research Council (ERC) Starting
Grant No. 801770 (ANGULON). H.S acknowledges support from the European Research
Council-AdG (Project No. 320459, DropletControl) and from The Villum Foundation
through a Villum Investigator grant no. 25886.
article_number: L061303
article_processing_charge: No
article_type: original
author:
- first_name: Igor
full_name: Cherepanov, Igor
id: 339C7E5A-F248-11E8-B48F-1D18A9856A87
last_name: Cherepanov
- first_name: Giacomo
full_name: Bighin, Giacomo
id: 4CA96FD4-F248-11E8-B48F-1D18A9856A87
last_name: Bighin
orcid: 0000-0001-8823-9777
- first_name: Constant A.
full_name: Schouder, Constant A.
last_name: Schouder
- first_name: Adam S.
full_name: Chatterley, Adam S.
last_name: Chatterley
- first_name: Simon H.
full_name: Albrechtsen, Simon H.
last_name: Albrechtsen
- first_name: Alberto Viñas
full_name: Muñoz, Alberto Viñas
last_name: Muñoz
- first_name: Lars
full_name: Christiansen, Lars
last_name: Christiansen
- first_name: Henrik
full_name: Stapelfeldt, Henrik
last_name: Stapelfeldt
- first_name: Mikhail
full_name: Lemeshko, Mikhail
id: 37CB05FA-F248-11E8-B48F-1D18A9856A87
last_name: Lemeshko
orcid: 0000-0002-6990-7802
citation:
ama: Cherepanov I, Bighin G, Schouder CA, et al. Excited rotational states of molecules
in a superfluid. Physical Review A. 2021;104(6). doi:10.1103/PhysRevA.104.L061303
apa: Cherepanov, I., Bighin, G., Schouder, C. A., Chatterley, A. S., Albrechtsen,
S. H., Muñoz, A. V., … Lemeshko, M. (2021). Excited rotational states of molecules
in a superfluid. Physical Review A. American Physical Society. https://doi.org/10.1103/PhysRevA.104.L061303
chicago: Cherepanov, Igor, Giacomo Bighin, Constant A. Schouder, Adam S. Chatterley,
Simon H. Albrechtsen, Alberto Viñas Muñoz, Lars Christiansen, Henrik Stapelfeldt,
and Mikhail Lemeshko. “Excited Rotational States of Molecules in a Superfluid.”
Physical Review A. American Physical Society, 2021. https://doi.org/10.1103/PhysRevA.104.L061303.
ieee: I. Cherepanov et al., “Excited rotational states of molecules in a
superfluid,” Physical Review A, vol. 104, no. 6. American Physical Society,
2021.
ista: Cherepanov I, Bighin G, Schouder CA, Chatterley AS, Albrechtsen SH, Muñoz
AV, Christiansen L, Stapelfeldt H, Lemeshko M. 2021. Excited rotational states
of molecules in a superfluid. Physical Review A. 104(6), L061303.
mla: Cherepanov, Igor, et al. “Excited Rotational States of Molecules in a Superfluid.”
Physical Review A, vol. 104, no. 6, L061303, American Physical Society,
2021, doi:10.1103/PhysRevA.104.L061303.
short: I. Cherepanov, G. Bighin, C.A. Schouder, A.S. Chatterley, S.H. Albrechtsen,
A.V. Muñoz, L. Christiansen, H. Stapelfeldt, M. Lemeshko, Physical Review A 104
(2021).
date_created: 2022-01-16T23:01:29Z
date_published: 2021-12-30T00:00:00Z
date_updated: 2023-08-17T06:52:17Z
day: '30'
department:
- _id: MiLe
doi: 10.1103/PhysRevA.104.L061303
ec_funded: 1
external_id:
arxiv:
- '2107.00468'
isi:
- '000739618300001'
intvolume: ' 104'
isi: 1
issue: '6'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: http://128.84.4.18/abs/2107.00468
month: '12'
oa: 1
oa_version: Preprint
project:
- _id: 26031614-B435-11E9-9278-68D0E5697425
call_identifier: FWF
grant_number: P29902
name: Quantum rotations in the presence of a many-body environment
- _id: 2688CF98-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '801770'
name: 'Angulon: physics and applications of a new quasiparticle'
- _id: 2564DBCA-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '665385'
name: International IST Doctoral Program
- _id: 26986C82-B435-11E9-9278-68D0E5697425
call_identifier: FWF
grant_number: M02641
name: A path-integral approach to composite impurities
publication: Physical Review A
publication_identifier:
eissn:
- 2469-9934
issn:
- 2469-9926
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Excited rotational states of molecules in a superfluid
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 104
year: '2021'
...
---
_id: '13997'
abstract:
- lang: eng
text: We investigate theoretically the strong-field regime of light-matter interactions
in the topological-insulator class of quantum materials. In particular, we focus
on the process of nonperturbative high-order harmonic generation from the paradigmatic
three-dimensional topological insulator bismuth selenide (Bi2Se3) subjected to
intense midinfrared laser fields. We analyze the contributions from the spin-orbit-coupled
bulk states and the topological surface bands separately and reveal a major difference
in how their harmonic yields depend on the ellipticity of the laser field. Bulk
harmonics show a monotonic decrease in their yield as the ellipticity increases,
in a manner reminiscent of high harmonic generation in gaseous media. However,
the surface contribution exhibits a highly nontrivial dependence, culminating
with a maximum for circularly polarized fields. We attribute the observed anomalous
behavior to (i) the enhanced amplitude and the circular pattern of the interband
dipole and the Berry connections in the vicinity of the Dirac point and (ii) the
influence of the higher-order, hexagonal warping terms in the Hamiltonian, which
are responsible for the hexagonal deformation of the energy surface at higher
momenta. The latter are associated directly with spin-orbit-coupling parameters.
Our results thus establish the sensitivity of strong-field-driven high harmonic
emission to the topology of the band structure as well as to the manifestations
of spin-orbit interaction.
article_number: '023101'
article_processing_charge: No
article_type: original
author:
- first_name: Denitsa Rangelova
full_name: Baykusheva, Denitsa Rangelova
id: 71b4d059-2a03-11ee-914d-dfa3beed6530
last_name: Baykusheva
- first_name: Alexis
full_name: Chacón, Alexis
last_name: Chacón
- first_name: Dasol
full_name: Kim, Dasol
last_name: Kim
- first_name: Dong Eon
full_name: Kim, Dong Eon
last_name: Kim
- first_name: David A.
full_name: Reis, David A.
last_name: Reis
- first_name: Shambhu
full_name: Ghimire, Shambhu
last_name: Ghimire
citation:
ama: Baykusheva DR, Chacón A, Kim D, Kim DE, Reis DA, Ghimire S. Strong-field physics
in three-dimensional topological insulators. Physical Review A. 2021;103(2).
doi:10.1103/physreva.103.023101
apa: Baykusheva, D. R., Chacón, A., Kim, D., Kim, D. E., Reis, D. A., & Ghimire,
S. (2021). Strong-field physics in three-dimensional topological insulators. Physical
Review A. American Physical Society. https://doi.org/10.1103/physreva.103.023101
chicago: Baykusheva, Denitsa Rangelova, Alexis Chacón, Dasol Kim, Dong Eon Kim,
David A. Reis, and Shambhu Ghimire. “Strong-Field Physics in Three-Dimensional
Topological Insulators.” Physical Review A. American Physical Society,
2021. https://doi.org/10.1103/physreva.103.023101.
ieee: D. R. Baykusheva, A. Chacón, D. Kim, D. E. Kim, D. A. Reis, and S. Ghimire,
“Strong-field physics in three-dimensional topological insulators,” Physical
Review A, vol. 103, no. 2. American Physical Society, 2021.
ista: Baykusheva DR, Chacón A, Kim D, Kim DE, Reis DA, Ghimire S. 2021. Strong-field
physics in three-dimensional topological insulators. Physical Review A. 103(2),
023101.
mla: Baykusheva, Denitsa Rangelova, et al. “Strong-Field Physics in Three-Dimensional
Topological Insulators.” Physical Review A, vol. 103, no. 2, 023101, American
Physical Society, 2021, doi:10.1103/physreva.103.023101.
short: D.R. Baykusheva, A. Chacón, D. Kim, D.E. Kim, D.A. Reis, S. Ghimire, Physical
Review A 103 (2021).
date_created: 2023-08-09T13:09:26Z
date_published: 2021-02-01T00:00:00Z
date_updated: 2023-08-22T07:33:43Z
day: '01'
doi: 10.1103/physreva.103.023101
extern: '1'
external_id:
arxiv:
- '2008.01265'
intvolume: ' 103'
issue: '2'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/2008.01265
month: '02'
oa: 1
oa_version: Preprint
publication: Physical Review A
publication_identifier:
eissn:
- 2469-9934
issn:
- 2469-9926
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Strong-field physics in three-dimensional topological insulators
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 103
year: '2021'
...
---
_id: '14009'
abstract:
- lang: eng
text: Attosecond delays between photoelectron wave packets emitted from different
electronic shells are now well established. Is there any delay between electrons
originating from the same electronic shell but leaving the cation in different
fine-structure states? This question is relevant for all attosecond photoemission
studies involving heavy elements, be it atoms, molecules or solids. We answer
this fundamental question by measuring energy-dependent delays between photoelectron
wave packets associated with the 2P3/2 and 2P1/2 components of the electronic
groundstates of Xe+ and Kr+. We observe delays reaching up to 33±6 as in the case
of Xe. Our results are compared with two state-of-the-art theories. Whereas both
theories quantitatively agree with the results obtained for Kr, neither of them
fully reproduces the experimental results in Xe. Performing delay measurements
very close to the ionization thresholds, we compare the agreement of several analytical
formulas for the continuum-continuum delays with experimental data. Our results
show an important influence of spin-orbit coupling on attosecond photoionization
delays, highlight the requirement for additional theory development, and offer
a precision benchmark for such work.
article_number: '013404'
article_processing_charge: No
article_type: original
author:
- first_name: I.
full_name: Jordan, I.
last_name: Jordan
- first_name: M.
full_name: Huppert, M.
last_name: Huppert
- first_name: S.
full_name: Pabst, S.
last_name: Pabst
- first_name: A. S.
full_name: Kheifets, A. S.
last_name: Kheifets
- first_name: Denitsa Rangelova
full_name: Baykusheva, Denitsa Rangelova
id: 71b4d059-2a03-11ee-914d-dfa3beed6530
last_name: Baykusheva
- first_name: H. J.
full_name: Wörner, H. J.
last_name: Wörner
citation:
ama: Jordan I, Huppert M, Pabst S, Kheifets AS, Baykusheva DR, Wörner HJ. Spin-orbit
delays in photoemission. Physical Review A. 2017;95(1). doi:10.1103/physreva.95.013404
apa: Jordan, I., Huppert, M., Pabst, S., Kheifets, A. S., Baykusheva, D. R., &
Wörner, H. J. (2017). Spin-orbit delays in photoemission. Physical Review A.
American Physical Society. https://doi.org/10.1103/physreva.95.013404
chicago: Jordan, I., M. Huppert, S. Pabst, A. S. Kheifets, Denitsa Rangelova Baykusheva,
and H. J. Wörner. “Spin-Orbit Delays in Photoemission.” Physical Review A.
American Physical Society, 2017. https://doi.org/10.1103/physreva.95.013404.
ieee: I. Jordan, M. Huppert, S. Pabst, A. S. Kheifets, D. R. Baykusheva, and H.
J. Wörner, “Spin-orbit delays in photoemission,” Physical Review A, vol.
95, no. 1. American Physical Society, 2017.
ista: Jordan I, Huppert M, Pabst S, Kheifets AS, Baykusheva DR, Wörner HJ. 2017.
Spin-orbit delays in photoemission. Physical Review A. 95(1), 013404.
mla: Jordan, I., et al. “Spin-Orbit Delays in Photoemission.” Physical Review
A, vol. 95, no. 1, 013404, American Physical Society, 2017, doi:10.1103/physreva.95.013404.
short: I. Jordan, M. Huppert, S. Pabst, A.S. Kheifets, D.R. Baykusheva, H.J. Wörner,
Physical Review A 95 (2017).
date_created: 2023-08-10T06:36:58Z
date_published: 2017-01-10T00:00:00Z
date_updated: 2023-08-22T08:38:17Z
day: '10'
doi: 10.1103/physreva.95.013404
extern: '1'
intvolume: ' 95'
issue: '1'
language:
- iso: eng
month: '01'
oa_version: None
publication: Physical Review A
publication_identifier:
eissn:
- 2469-9934
issn:
- 2469-9926
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Spin-orbit delays in photoemission
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 95
year: '2017'
...