---
OA_place: repository
OA_type: green
_id: '18973'
abstract:
- lang: eng
text: 'Understanding the reasons behind the exceptional success of transformers
requires a better analysis of why attention layers are suitable for NLP tasks.
In particular, such tasks require predictive models to capture contextual meaning
which often depends on one or few words, even if the sentence is long. Our work
studies this key property, dubbed word sensitivity (WS), in the prototypical setting
of random features. We show that attention layers enjoy high WS, namely, there
exists a vector in the space of embeddings that largely perturbs the random attention
features map. The argument critically exploits the role of the softmax in the
attention layer, highlighting its benefit compared to other activations (e.g.,
ReLU). In contrast, the WS of standard random features is of order 1/n−−√, n being
the number of words in the textual sample, and thus it decays with the length
of the context. We then translate these results on the word sensitivity into generalization
bounds: due to their low WS, random features provably cannot learn to distinguish
between two sentences that differ only in a single word; in contrast, due to their
high WS, random attention features have higher generalization capabilities. We
validate our theoretical results with experimental evidence over the BERT-Base
word embeddings of the imdb review dataset.'
acknowledgement: The authors were partially supported by the 2019 LopezLoreta prize,
and they would like to thank Mohammad Hossein Amani, Lorenzo Beretta, and Clement
Rebuffel for helpful discussions.
alternative_title:
- PMLR
article_processing_charge: No
arxiv: 1
author:
- first_name: Simone
full_name: Bombari, Simone
id: ca726dda-de17-11ea-bc14-f9da834f63aa
last_name: Bombari
- first_name: Marco
full_name: Mondelli, Marco
id: 27EB676C-8706-11E9-9510-7717E6697425
last_name: Mondelli
orcid: 0000-0002-3242-7020
citation:
ama: 'Bombari S, Mondelli M. Towards understanding the word sensitivity of attention
layers: A study via random features. In: 41st International Conference on Machine
Learning. Vol 235. ML Research Press; 2024:4300-4328.'
apa: 'Bombari, S., & Mondelli, M. (2024). Towards understanding the word sensitivity
of attention layers: A study via random features. In 41st International Conference
on Machine Learning (Vol. 235, pp. 4300–4328). Vienna, Austria: ML Research
Press.'
chicago: 'Bombari, Simone, and Marco Mondelli. “Towards Understanding the Word Sensitivity
of Attention Layers: A Study via Random Features.” In 41st International Conference
on Machine Learning, 235:4300–4328. ML Research Press, 2024.'
ieee: 'S. Bombari and M. Mondelli, “Towards understanding the word sensitivity of
attention layers: A study via random features,” in 41st International Conference
on Machine Learning, Vienna, Austria, 2024, vol. 235, pp. 4300–4328.'
ista: 'Bombari S, Mondelli M. 2024. Towards understanding the word sensitivity of
attention layers: A study via random features. 41st International Conference on
Machine Learning. ICML: International Conference on Machine Learning, PMLR, vol.
235, 4300–4328.'
mla: 'Bombari, Simone, and Marco Mondelli. “Towards Understanding the Word Sensitivity
of Attention Layers: A Study via Random Features.” 41st International Conference
on Machine Learning, vol. 235, ML Research Press, 2024, pp. 4300–28.'
short: S. Bombari, M. Mondelli, in:, 41st International Conference on Machine Learning,
ML Research Press, 2024, pp. 4300–4328.
conference:
end_date: 2024-07-27
location: Vienna, Austria
name: 'ICML: International Conference on Machine Learning'
start_date: 2024-07-21
corr_author: '1'
das_tickbox: '0'
date_created: 2025-01-30T07:35:49Z
date_published: 2024-07-30T00:00:00Z
date_updated: 2026-10-16T10:42:17Z
day: '30'
department:
- _id: MaMo
external_id:
arxiv:
- '2402.02969'
intvolume: ' 235'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.48550/arXiv.2402.02969
month: '07'
oa: 1
oa_version: Preprint
page: 4300-4328
project:
- _id: 059876FA-7A3F-11EA-A408-12923DDC885E
name: Prix Lopez-Loretta 2019 - Marco Mondelli
publication: 41st International Conference on Machine Learning
publication_identifier:
eissn:
- 2640-3498
publication_status: published
publisher: ML Research Press
quality_controlled: '1'
related_material:
record:
- id: '22857'
relation: dissertation_contains
status: public
researchdata_availability: no
scopus_import: '1'
status: public
supplementarymaterial: no
title: 'Towards understanding the word sensitivity of attention layers: A study via
random features'
type: conference
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 235
year: '2024'
...
---
OA_place: repository
OA_type: green
_id: '18972'
abstract:
- lang: eng
text: 'Deep learning models are known to overfit and memorize spurious features
in the training dataset. While numerous empirical studies have aimed at understanding
this phenomenon, a rigorous theoretical framework to quantify it is still missing.
In this paper, we consider spurious features that are uncorrelated with the learning
task, and we provide a precise characterization of how they are memorized via
two separate terms: (i) the stability of the model with respect to individual
training samples, and (ii) the feature alignment between the spurious pattern
and the full sample. While the first term is well established in learning theory
and it is connected to the generalization error in classical work, the second
one is, to the best of our knowledge, novel. Our key technical result gives a
precise characterization of the feature alignment for the two prototypical settings
of random features (RF) and neural tangent kernel (NTK) regression. We prove that
the memorization of spurious features weakens as the generalization capability
increases and, through the analysis of the feature alignment, we unveil the role
of the model and of its activation function. Numerical experiments show the predictive
power of our theory on standard datasets (MNIST, CIFAR-10).'
acknowledgement: "The authors were partially supported by the 2019 LopezLoreta prize,
and they would like to thank (in alphabetical order) Grigorios Chrysos, Simone Maria
Giancola, Mahyar\r\nJafari Nodeh, Christoph Lampert, Marco Miani, GuanWen Qiu, and
Peter Sukenık for helpful discussions."
alternative_title:
- PMLR
article_processing_charge: No
arxiv: 1
author:
- first_name: Simone
full_name: Bombari, Simone
id: ca726dda-de17-11ea-bc14-f9da834f63aa
last_name: Bombari
- first_name: Marco
full_name: Mondelli, Marco
id: 27EB676C-8706-11E9-9510-7717E6697425
last_name: Mondelli
orcid: 0000-0002-3242-7020
citation:
ama: 'Bombari S, Mondelli M. How spurious features are memorized: Precise analysis
for random and NTK features. In: 41st International Conference on Machine Learning.
Vol 235. ML Research Press; 2024:4267-4299.'
apa: 'Bombari, S., & Mondelli, M. (2024). How spurious features are memorized:
Precise analysis for random and NTK features. In 41st International Conference
on Machine Learning (Vol. 235, pp. 4267–4299). Vienna, Austria: ML Research
Press.'
chicago: 'Bombari, Simone, and Marco Mondelli. “How Spurious Features Are Memorized:
Precise Analysis for Random and NTK Features.” In 41st International Conference
on Machine Learning, 235:4267–99. ML Research Press, 2024.'
ieee: 'S. Bombari and M. Mondelli, “How spurious features are memorized: Precise
analysis for random and NTK features,” in 41st International Conference on
Machine Learning, Vienna, Austria, 2024, vol. 235, pp. 4267–4299.'
ista: 'Bombari S, Mondelli M. 2024. How spurious features are memorized: Precise
analysis for random and NTK features. 41st International Conference on Machine
Learning. ICML: International Conference on Machine Learning, PMLR, vol. 235,
4267–4299.'
mla: 'Bombari, Simone, and Marco Mondelli. “How Spurious Features Are Memorized:
Precise Analysis for Random and NTK Features.” 41st International Conference
on Machine Learning, vol. 235, ML Research Press, 2024, pp. 4267–99.'
short: S. Bombari, M. Mondelli, in:, 41st International Conference on Machine Learning,
ML Research Press, 2024, pp. 4267–4299.
conference:
end_date: 2024-07-27
location: Vienna, Austria
name: 'ICML: International Conference on Machine Learning'
start_date: 2024-07-21
corr_author: '1'
das_tickbox: '0'
date_created: 2025-01-30T07:29:47Z
date_published: 2024-07-30T00:00:00Z
date_updated: 2026-10-16T10:42:37Z
day: '30'
department:
- _id: MaMo
external_id:
arxiv:
- '2305.12100'
intvolume: ' 235'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.48550/arXiv.2305.12100
month: '07'
oa: 1
oa_version: Preprint
page: 4267-4299
project:
- _id: 059876FA-7A3F-11EA-A408-12923DDC885E
name: Prix Lopez-Loretta 2019 - Marco Mondelli
publication: 41st International Conference on Machine Learning
publication_identifier:
eissn:
- 2640-3498
publication_status: published
publisher: ML Research Press
quality_controlled: '1'
related_material:
record:
- id: '22857'
relation: dissertation_contains
status: public
researchdata_availability: no
scopus_import: '1'
status: public
supplementarymaterial: yes
title: 'How spurious features are memorized: Precise analysis for random and NTK features'
type: conference
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 235
year: '2024'
...
---
OA_place: repository
OA_type: green
_id: '17330'
abstract:
- lang: eng
text: In this work we consider the list-decodability and list-recoverability of
arbitrary q -ary codes, for all integer values of q ⩾ 2. A code is called ( p
, L ) q -list-decodable if every radius pn Hamming ball contains less than L codewords;
( p , ℓ, L ) q -recoverability is a generalization where we place radius pn Hamming
balls on every point of a combinatorial rectangle with side length ℓ and again
stipulate that there be less than L codewords. Our main contribution is to precisely
calculate the maximum value of p for which there exist infinite families of positive
rate ( p , ℓ, L ) q -list-recoverable codes, the quantity we call the zero-rate
threshold . Denoting this value by p *, we in fact show that codes correcting
a p * + ε fraction of errors must have size O ε (1), i.e., independent of n .
Such a result is typically referred to as a “Plotkin bound.” To complement this,
a standard random code with expurgation construction shows that there exist positive
rate codes correcting a p * − ε fraction of errors. We also follow a classical
proof template (typically attributed to Elias and Bassalygo) to derive from the
zero-rate threshold other tradeoffs between rate and decoding radius for list-decoding
and list-recovery. Technically, proving the Plotkin bound boils down to demon-strating
the Schur convexity of a certain function defined on the q -simplex as well as
the convexity of a univariate function derived from it. We remark that an earlier
argument claimed similar results for q -ary list-decoding; however, we point out
that this earlier proof is flawed.
acknowledgement: Part of this work was done while Nicolas Resch was affiliated with
the Centrum Wiskunde & Informatica and supported in part by ERC H2020 grant No.74079
(ALGSTRONGCRYPTO). Chen Yuan is supported in part by the National Key Research and
Development Projects under Grant 2022YFA1004900 and Grant 2021YFE0109900, the National
Natural Science Foundation of China under Grant 12101403 and Grant 12031011.
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Nicolas
full_name: Resch, Nicolas
last_name: Resch
- first_name: Chen
full_name: Yuan, Chen
last_name: Yuan
- first_name: Yihan
full_name: Zhang, Yihan
id: 2ce5da42-b2ea-11eb-bba5-9f264e9d002c
last_name: Zhang
orcid: 0000-0002-6465-6258
citation:
ama: Resch N, Yuan C, Zhang Y. Zero-rate thresholds and new capacity bounds for
list-decoding and list-recovery. IEEE Transactions on Information Theory.
2024;70(9):6211-6238. doi:10.1109/TIT.2024.3430842
apa: Resch, N., Yuan, C., & Zhang, Y. (2024). Zero-rate thresholds and new capacity
bounds for list-decoding and list-recovery. IEEE Transactions on Information
Theory. IEEE. https://doi.org/10.1109/TIT.2024.3430842
chicago: Resch, Nicolas, Chen Yuan, and Yihan Zhang. “Zero-Rate Thresholds and New
Capacity Bounds for List-Decoding and List-Recovery.” IEEE Transactions on
Information Theory. IEEE, 2024. https://doi.org/10.1109/TIT.2024.3430842.
ieee: N. Resch, C. Yuan, and Y. Zhang, “Zero-rate thresholds and new capacity bounds
for list-decoding and list-recovery,” IEEE Transactions on Information Theory,
vol. 70, no. 9. IEEE, pp. 6211–6238, 2024.
ista: Resch N, Yuan C, Zhang Y. 2024. Zero-rate thresholds and new capacity bounds
for list-decoding and list-recovery. IEEE Transactions on Information Theory.
70(9), 6211–6238.
mla: Resch, Nicolas, et al. “Zero-Rate Thresholds and New Capacity Bounds for List-Decoding
and List-Recovery.” IEEE Transactions on Information Theory, vol. 70, no.
9, IEEE, 2024, pp. 6211–38, doi:10.1109/TIT.2024.3430842.
short: N. Resch, C. Yuan, Y. Zhang, IEEE Transactions on Information Theory 70 (2024)
6211–6238.
corr_author: '1'
das_tickbox: '0'
date_created: 2024-07-28T22:01:10Z
date_published: 2024-09-01T00:00:00Z
date_updated: 2026-10-16T10:41:59Z
day: '01'
department:
- _id: MaMo
doi: 10.1109/TIT.2024.3430842
external_id:
arxiv:
- '2210.07754'
isi:
- '001299623600019'
fulldoi: https://doi.org/10.1109/TIT.2024.3430842
intvolume: ' 70'
isi: 1
issue: '9'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/2210.07754
month: '09'
oa: 1
oa_version: Preprint
page: 6211-6238
publication: IEEE Transactions on Information Theory
publication_identifier:
eissn:
- 1557-9654
issn:
- 0018-9448
publication_status: published
publisher: IEEE
quality_controlled: '1'
related_material:
record:
- id: '14083'
relation: earlier_version
status: public
researchdata_availability: no
scopus_import: '1'
status: public
supplementarymaterial: no
title: Zero-rate thresholds and new capacity bounds for list-decoding and list-recovery
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 70
year: '2024'
...
---
OA_type: closed access
_id: '18652'
abstract:
- lang: eng
text: 'Over the last 70 years, information theory and coding has enabled communication
technologies that have had an astounding impact on our lives. This is possible
due to the match between encoding/decoding strategies and corresponding channel
models. Traditional studies of channels have taken one of two extremes: Shannon-theoretic
models are inherently average-case in which channel noise is governed by a memoryless
stochastic process, whereas coding-theoretic (referred to as “Hamming”) models
take a worst-case, adversarial, view of the noise. However, for several existing
and emerging communication systems the Shannon/average-case view may be too optimistic,
whereas the Hamming/worstcase view may be too pessimistic. This monograph takes
up the challenge of studying adversarial channel models that lie between the Shannon
and Hamming extremes.'
article_processing_charge: No
article_type: original
author:
- first_name: Bikash Kumar
full_name: Dey, Bikash Kumar
last_name: Dey
- first_name: Sidharth
full_name: Jaggi, Sidharth
last_name: Jaggi
- first_name: Michael
full_name: Langberg, Michael
last_name: Langberg
- first_name: Anand D.
full_name: Sarwate, Anand D.
last_name: Sarwate
- first_name: Yihan
full_name: Zhang, Yihan
id: 2ce5da42-b2ea-11eb-bba5-9f264e9d002c
last_name: Zhang
orcid: 0000-0002-6465-6258
citation:
ama: 'Dey BK, Jaggi S, Langberg M, Sarwate AD, Zhang Y. Codes for adversaries: Between
worst-case and average-case jamming. Foundations and Trends in Communications
and Information Theory. 2024;21(3-4):300-588. doi:10.1561/0100000112'
apa: 'Dey, B. K., Jaggi, S., Langberg, M., Sarwate, A. D., & Zhang, Y. (2024).
Codes for adversaries: Between worst-case and average-case jamming. Foundations
and Trends in Communications and Information Theory. Now Publishers. https://doi.org/10.1561/0100000112'
chicago: 'Dey, Bikash Kumar, Sidharth Jaggi, Michael Langberg, Anand D. Sarwate,
and Yihan Zhang. “Codes for Adversaries: Between Worst-Case and Average-Case Jamming.”
Foundations and Trends in Communications and Information Theory. Now Publishers,
2024. https://doi.org/10.1561/0100000112.'
ieee: 'B. K. Dey, S. Jaggi, M. Langberg, A. D. Sarwate, and Y. Zhang, “Codes for
adversaries: Between worst-case and average-case jamming,” Foundations and
Trends in Communications and Information Theory, vol. 21, no. 3–4. Now Publishers,
pp. 300–588, 2024.'
ista: 'Dey BK, Jaggi S, Langberg M, Sarwate AD, Zhang Y. 2024. Codes for adversaries:
Between worst-case and average-case jamming. Foundations and Trends in Communications
and Information Theory. 21(3–4), 300–588.'
mla: 'Dey, Bikash Kumar, et al. “Codes for Adversaries: Between Worst-Case and Average-Case
Jamming.” Foundations and Trends in Communications and Information Theory,
vol. 21, no. 3–4, Now Publishers, 2024, pp. 300–588, doi:10.1561/0100000112.'
short: B.K. Dey, S. Jaggi, M. Langberg, A.D. Sarwate, Y. Zhang, Foundations and
Trends in Communications and Information Theory 21 (2024) 300–588.
corr_author: '1'
date_created: 2024-12-15T23:01:50Z
date_published: 2024-12-03T00:00:00Z
date_updated: 2026-10-16T10:40:55Z
day: '03'
department:
- _id: MaMo
doi: 10.1561/0100000112
fulldoi: https://doi.org/10.1561/0100000112
intvolume: ' 21'
issue: 3-4
language:
- iso: eng
month: '12'
oa_version: None
page: 300-588
publication: Foundations and Trends in Communications and Information Theory
publication_identifier:
eissn:
- 1567-2328
issn:
- 1567-2190
publication_status: published
publisher: Now Publishers
quality_controlled: '1'
researchdata_availability: unclear
scopus_import: '1'
status: public
supplementarymaterial: unclear
title: 'Codes for adversaries: Between worst-case and average-case jamming'
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 21
year: '2024'
...
---
APC_amount: 3711,01 EUR
DOAJ_listed: '1'
OA_place: publisher
OA_type: gold
_id: '18488'
abstract:
- lang: eng
text: The advancement of quantum simulators motivates the development of a theoretical
framework to assist with efficient state preparation in quantum many-body systems.
Generally, preparing a target entangled state via unitary evolution with time-dependent
couplings is a challenging task and very little is known about the existence of
solutions and their properties. In this work we develop a constructive approach
for preparing matrix product states (MPS) via continuous unitary evolution. We
provide an explicit construction of the operator that exactly implements the evolution
of a given MPS along a specified direction in its tangent space. This operator
can be written as a sum of local terms of finite range, yet it is in general non-Hermitian.
Relying on the explicit construction of the non-Hermitian generator of the dynamics,
we demonstrate the existence of a Hermitian sequence of operators that implements
the desired MPS evolution with an error that decreases exponentially with the
operator range. The construction is benchmarked on an explicit periodic trajectory
in a translationally invariant MPS manifold. We demonstrate that the Floquet unitary
generating the dynamics over one period of the trajectory features an approximate
MPS-like eigenstate embedded among a sea of thermalizing eigenstates. These results
show that our construction is not only useful for state preparation and control
of many-body systems, but also provides a generic route towards Floquet scars—periodically
driven models with quasilocal generators of dynamics that have exact MPS eigenstates
in their spectrum.
acknowledgement: We thank L. Piroli, S. Garratt, and A. Molnár for insightful discussions.
This research was funded in part by the European Research Council (ERC) under the
European Union’s Horizon 2020 research and innovation programme (Grant Agreements
No. 850899 and No. 863476), the Austrian Science Fund (FWF) (Grant DOIs 10.55776/COE1,
10.55776/P36305, and 10.55776/F71), and the European Union (NextGenerationEU). This
work was performed in part at the Aspen Center for Physics, which is supported by
National Science Foundation Grant PHY-2210452. This research was supported in part
by NSF Grant PHY-2309135 to the Kavli Institute for Theoretical Physics (KITP).
article_number: '040311'
article_processing_charge: Yes
article_type: original
arxiv: 1
author:
- first_name: Marko
full_name: Ljubotina, Marko
id: F75EE9BE-5C90-11EA-905D-16643DDC885E
last_name: Ljubotina
orcid: 0000-0003-0038-7068
- first_name: Elena
full_name: Petrova, Elena
id: 0ac84990-897b-11ed-a09c-f5abb56a4ede
last_name: Petrova
- first_name: Norbert
full_name: Schuch, Norbert
last_name: Schuch
- first_name: Maksym
full_name: Serbyn, Maksym
id: 47809E7E-F248-11E8-B48F-1D18A9856A87
last_name: Serbyn
orcid: 0000-0002-2399-5827
citation:
ama: Ljubotina M, Petrova E, Schuch N, Serbyn M. Tangent space generators of matrix
product states and exact floquet quantum scars. PRX Quantum. 2024;5(4).
doi:10.1103/prxquantum.5.040311
apa: Ljubotina, M., Petrova, E., Schuch, N., & Serbyn, M. (2024). Tangent space
generators of matrix product states and exact floquet quantum scars. PRX Quantum.
American Physical Society. https://doi.org/10.1103/prxquantum.5.040311
chicago: Ljubotina, Marko, Elena Petrova, Norbert Schuch, and Maksym Serbyn. “Tangent
Space Generators of Matrix Product States and Exact Floquet Quantum Scars.” PRX
Quantum. American Physical Society, 2024. https://doi.org/10.1103/prxquantum.5.040311.
ieee: M. Ljubotina, E. Petrova, N. Schuch, and M. Serbyn, “Tangent space generators
of matrix product states and exact floquet quantum scars,” PRX Quantum,
vol. 5, no. 4. American Physical Society, 2024.
ista: Ljubotina M, Petrova E, Schuch N, Serbyn M. 2024. Tangent space generators
of matrix product states and exact floquet quantum scars. PRX Quantum. 5(4), 040311.
mla: Ljubotina, Marko, et al. “Tangent Space Generators of Matrix Product States
and Exact Floquet Quantum Scars.” PRX Quantum, vol. 5, no. 4, 040311, American
Physical Society, 2024, doi:10.1103/prxquantum.5.040311.
short: M. Ljubotina, E. Petrova, N. Schuch, M. Serbyn, PRX Quantum 5 (2024).
corr_author: '1'
das_tickbox: '0'
date_created: 2024-10-29T16:04:05Z
date_published: 2024-10-23T00:00:00Z
date_updated: 2026-10-16T12:13:31Z
day: '23'
ddc:
- '530'
department:
- _id: MaSe
doi: 10.1103/prxquantum.5.040311
ec_funded: 1
external_id:
arxiv:
- '2403.12325'
isi:
- '001346198800001'
file:
- access_level: open_access
checksum: 2e057ba021744d0a74602517935326b3
content_type: application/pdf
creator: dernst
date_created: 2024-10-30T08:59:09Z
date_updated: 2024-10-30T08:59:09Z
file_id: '18489'
file_name: 2024_PRXQuantum_Ljubotina.pdf
file_size: 1151431
relation: main_file
success: 1
file_date_updated: 2024-10-30T08:59:09Z
fulldoi: https://doi.org/10.1103/prxquantum.5.040311
has_accepted_license: '1'
intvolume: ' 5'
isi: 1
issue: '4'
language:
- iso: eng
license: https://creativecommons.org/licenses/by/4.0/
month: '10'
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: PRX Quantum
publication_identifier:
eissn:
- 2691-3399
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
researchdata_availability: no
scopus_import: '1'
status: public
supplementarymaterial: yes
title: Tangent space generators of matrix product states and exact floquet quantum
scars
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: 5
year: '2024'
...
---
DOAJ_listed: '1'
OA_place: publisher
OA_type: gold
_id: '18176'
abstract:
- lang: eng
text: Introducing a class of SU(2) invariant quantum unitary circuits generating
chiral transport, we examine the role of broken space-reflection and time-reversal
symmetries on spin-transport properties. Upon adjusting parameters of local unitary
gates, the dynamics can be either chaotic or integrable. The latter corresponds
to a generalization of the space-time discretized (Trotterized) higher-spin quantum
Heisenberg chain. We demonstrate that breaking of space-reflection symmetry results
in a drift in the dynamical spin susceptibility. Remarkably, we find a universal
drift velocity given by a simple formula, which, at zero average magnetization,
depends only on the values of SU(2) Casimir invariants associated with local spins.
In the integrable case, the drift velocity formula is confirmed analytically based
on the exact solution of thermodynamic Bethe ansatz equations. Finally, by inspecting
the large fluctuations of the time-integrated current between two halves of the
system in stationary maximum-entropy states, we demonstrate violation of the Gallavotti-Cohen
symmetry, implying that such states cannot be regarded as equilibrium ones. We
show that the scaled cumulant generating function of the time-integrated current
instead obeys a generalized fluctuation relation.
acknowledgement: "The authors thank Denis Bernard, Jérôme Dubail, Hosho Katsura, Kareljan
Schoutens, and Alberto Zorzato for stimulating discussions. This work has been supported
by: Slovenian Research Agency (ARIS) under Grants No. N1-0219 (T.P., L.Z.), No.
N1-0334 (T.P., L.Z.), No. N1-0243 (E.I.), and under Research Program P1-0402 (E.I.,
T.P., L.Z.). European Research Council (ERC) under Consolidator Grant No. 771536—NEMO
(L.Z.), Advanced Grant No.\r\n101096208—QUEST (T.P., L.Z.), and Starting Grant No.
850899—NEQuM (M.L.). Simons Foundation under Simons Junior Fellowship Grant No.
1141511 (Ž.K.). M.L. acknowledges the hospitality of the Aspen Center for Physics,
which is supported by National Science Foundation Grant No. PHY-2210452. Numerical
simulations were performed using the ITensor library [117]. "
article_number: '030356'
article_processing_charge: Yes
article_type: original
arxiv: 1
author:
- first_name: Lenart
full_name: Zadnik, Lenart
last_name: Zadnik
- first_name: Marko
full_name: Ljubotina, Marko
id: F75EE9BE-5C90-11EA-905D-16643DDC885E
last_name: Ljubotina
orcid: 0000-0003-0038-7068
- first_name: Žiga
full_name: Krajnik, Žiga
last_name: Krajnik
- first_name: Enej
full_name: Ilievski, Enej
last_name: Ilievski
- first_name: Tomaž
full_name: Prosen, Tomaž
last_name: Prosen
citation:
ama: Zadnik L, Ljubotina M, Krajnik Ž, Ilievski E, Prosen T. Quantum many-body spin
ratchets. PRX Quantum. 2024;5(3). doi:10.1103/PRXQuantum.5.030356
apa: Zadnik, L., Ljubotina, M., Krajnik, Ž., Ilievski, E., & Prosen, T. (2024).
Quantum many-body spin ratchets. PRX Quantum. American Physical Society.
https://doi.org/10.1103/PRXQuantum.5.030356
chicago: Zadnik, Lenart, Marko Ljubotina, Žiga Krajnik, Enej Ilievski, and Tomaž
Prosen. “Quantum Many-Body Spin Ratchets.” PRX Quantum. American Physical
Society, 2024. https://doi.org/10.1103/PRXQuantum.5.030356.
ieee: L. Zadnik, M. Ljubotina, Ž. Krajnik, E. Ilievski, and T. Prosen, “Quantum
many-body spin ratchets,” PRX Quantum, vol. 5, no. 3. American Physical
Society, 2024.
ista: Zadnik L, Ljubotina M, Krajnik Ž, Ilievski E, Prosen T. 2024. Quantum many-body
spin ratchets. PRX Quantum. 5(3), 030356.
mla: Zadnik, Lenart, et al. “Quantum Many-Body Spin Ratchets.” PRX Quantum,
vol. 5, no. 3, 030356, American Physical Society, 2024, doi:10.1103/PRXQuantum.5.030356.
short: L. Zadnik, M. Ljubotina, Ž. Krajnik, E. Ilievski, T. Prosen, PRX Quantum
5 (2024).
das_tickbox: '0'
date_created: 2024-10-06T22:01:12Z
date_published: 2024-09-25T00:00:00Z
date_updated: 2026-10-16T12:13:08Z
day: '25'
ddc:
- '530'
department:
- _id: MaSe
doi: 10.1103/PRXQuantum.5.030356
ec_funded: 1
external_id:
arxiv:
- '2406.01571'
isi:
- '001327172800001'
file:
- access_level: open_access
checksum: bc230631255d3bcf8bcbbc8fdbfefcf2
content_type: application/pdf
creator: dernst
date_created: 2024-10-07T11:04:12Z
date_updated: 2024-10-07T11:04:12Z
file_id: '18183'
file_name: 2024_PRXQuantum_Zadnik.pdf
file_size: 1061648
relation: main_file
success: 1
file_date_updated: 2024-10-07T11:04:12Z
fulldoi: https://doi.org/10.1103/PRXQuantum.5.030356
has_accepted_license: '1'
intvolume: ' 5'
isi: 1
issue: '3'
language:
- iso: eng
month: '09'
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: PRX Quantum
publication_identifier:
eissn:
- 2691-3399
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
researchdata_availability: no
scopus_import: '1'
status: public
supplementarymaterial: yes
title: Quantum many-body spin ratchets
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: 5
year: '2024'
...
---
DOAJ_listed: '1'
_id: '15122'
abstract:
- lang: eng
text: Quantum computers are increasing in size and quality but are still very noisy.
Error mitigation extends the size of the quantum circuits that noisy devices can
meaningfully execute. However, state-of-the-art error mitigation methods are hard
to implement and the limited qubit connectivity in superconducting qubit devices
restricts most applications to the hardware's native topology. Here we show a
quantum approximate optimization algorithm (QAOA) on nonplanar random regular
graphs with up to 40 nodes enabled by a machine learning-based error mitigation.
We use a swap network with careful decision-variable-to-qubit mapping and a feed-forward
neural network to optimize a depth-two QAOA on up to 40 qubits. We observe a meaningful
parameter optimization for the largest graph which requires running quantum circuits
with 958 two-qubit gates. Our paper emphasizes the need to mitigate samples, and
not only expectation values, in quantum approximate optimization. These results
are a step towards executing quantum approximate optimization at a scale that
is not classically simulable. Reaching such system sizes is key to properly understanding
the true potential of heuristic algorithms like QAOA.
acknowledgement: S.H.S. acknowledges support from the IBM Ph.D. fellowship 2022 in
quantum computing. The authors also thank M. Serbyn, R. Kueng, R. A. Medina, and
S. Woerner for fruitful discussions.
article_number: '013223'
article_processing_charge: Yes
article_type: original
arxiv: 1
author:
- first_name: Stefan
full_name: Sack, Stefan
id: dd622248-f6e0-11ea-865d-ce382a1c81a5
last_name: Sack
orcid: 0000-0001-5400-8508
- first_name: Daniel J.
full_name: Egger, Daniel J.
last_name: Egger
citation:
ama: Sack S, Egger DJ. Large-scale quantum approximate optimization on nonplanar
graphs with machine learning noise mitigation. Physical Review Research.
2024;6(1). doi:10.1103/PhysRevResearch.6.013223
apa: Sack, S., & Egger, D. J. (2024). Large-scale quantum approximate optimization
on nonplanar graphs with machine learning noise mitigation. Physical Review
Research. American Physical Society. https://doi.org/10.1103/PhysRevResearch.6.013223
chicago: Sack, Stefan, and Daniel J. Egger. “Large-Scale Quantum Approximate Optimization
on Nonplanar Graphs with Machine Learning Noise Mitigation.” Physical Review
Research. American Physical Society, 2024. https://doi.org/10.1103/PhysRevResearch.6.013223.
ieee: S. Sack and D. J. Egger, “Large-scale quantum approximate optimization on
nonplanar graphs with machine learning noise mitigation,” Physical Review Research,
vol. 6, no. 1. American Physical Society, 2024.
ista: Sack S, Egger DJ. 2024. Large-scale quantum approximate optimization on nonplanar
graphs with machine learning noise mitigation. Physical Review Research. 6(1),
013223.
mla: Sack, Stefan, and Daniel J. Egger. “Large-Scale Quantum Approximate Optimization
on Nonplanar Graphs with Machine Learning Noise Mitigation.” Physical Review
Research, vol. 6, no. 1, 013223, American Physical Society, 2024, doi:10.1103/PhysRevResearch.6.013223.
short: S. Sack, D.J. Egger, Physical Review Research 6 (2024).
corr_author: '1'
das_tickbox: '0'
date_created: 2024-03-17T23:00:59Z
date_published: 2024-03-01T00:00:00Z
date_updated: 2026-10-16T12:12:26Z
day: '01'
ddc:
- '530'
department:
- _id: MaSe
doi: 10.1103/PhysRevResearch.6.013223
external_id:
arxiv:
- '2307.14427'
file:
- access_level: open_access
checksum: 274c9f1b15b3547a10a03f39e4ccc582
content_type: application/pdf
creator: dernst
date_created: 2024-03-19T07:16:38Z
date_updated: 2024-03-19T07:16:38Z
file_id: '15123'
file_name: 2024_PhysicalReviewResearch_Sack.pdf
file_size: 2777593
relation: main_file
success: 1
file_date_updated: 2024-03-19T07:16:38Z
fulldoi: https://doi.org/10.1103/PhysRevResearch.6.013223
has_accepted_license: '1'
intvolume: ' 6'
issue: '1'
language:
- iso: eng
month: '03'
oa: 1
oa_version: Published Version
project:
- _id: bd660c93-d553-11ed-ba76-fb0fb6f49c0d
name: IBM PhD Nomination Fellowship - Stefan Sack
publication: Physical Review Research
publication_identifier:
eissn:
- 2643-1564
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
researchdata_availability: no
scopus_import: '1'
status: public
supplementarymaterial: yes
title: Large-scale quantum approximate optimization on nonplanar graphs with machine
learning noise mitigation
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: 6
year: '2024'
...
---
_id: '18110'
abstract:
- lang: eng
text: We study a chaotic particle-conserving kinetically constrained model, with
a single parameter which allows us to break reflection symmetry. Through extensive
numerical simulations we find that the domain wall state shows a variety of dynamical
behaviors from localization all the way to ballistic transport, depending on the
value of the reflection breaking parameter. Surprisingly, such anomalous behavior
is not mirrored in infinite-temperature dynamics, which appear to scale diffusively,
in line with expectations for generic interacting models. However, studying the
particle density gradient, we show that the lack of reflection symmetry affects
infinite-temperature dynamics, resulting in an asymmetric dynamical structure
factor. This is in disagreement with normal diffusion and suggests that the model
may also exhibit anomalous dynamics at infinite temperature in the thermodynamic
limit. Finally, we observe low-entangled eigenstates in the spectrum of the model,
a telltale sign of quantum many-body scars.
acknowledgement: "The authors acknowledge useful discussions with M. Serbyn, Z. Papic,
and A. Nunnenkamp. ´\r\nP.B. is supported by the Erwin Schrödinger Center for Quantum
Science & Technology (ESQ) of the Österreichische Akademie der Wissenschaften (ÖAW)
under the Discovery Grant. M.L. acknowledges support from the European Research
Council (ERC) under the European Union’s Horizon 2020 research and innovation programme
(Grant Agreement\r\nNo. 850899). The numerical simulations were performed using
the ITensor library [68] on the Vienna Scientific Cluster (VSC)."
article_number: L100304
article_processing_charge: No
article_type: letter_note
arxiv: 1
author:
- first_name: Pietro
full_name: Brighi, Pietro
id: 4115AF5C-F248-11E8-B48F-1D18A9856A87
last_name: Brighi
orcid: 0000-0002-7969-2729
- first_name: Marko
full_name: Ljubotina, Marko
id: F75EE9BE-5C90-11EA-905D-16643DDC885E
last_name: Ljubotina
orcid: 0000-0003-0038-7068
citation:
ama: Brighi P, Ljubotina M. Anomalous transport in the kinetically constrained quantum
East-West model. Physical Review B. 2024;110(10). doi:10.1103/PhysRevB.110.L100304
apa: Brighi, P., & Ljubotina, M. (2024). Anomalous transport in the kinetically
constrained quantum East-West model. Physical Review B. American Physical
Society. https://doi.org/10.1103/PhysRevB.110.L100304
chicago: Brighi, Pietro, and Marko Ljubotina. “Anomalous Transport in the Kinetically
Constrained Quantum East-West Model.” Physical Review B. American Physical
Society, 2024. https://doi.org/10.1103/PhysRevB.110.L100304.
ieee: P. Brighi and M. Ljubotina, “Anomalous transport in the kinetically constrained
quantum East-West model,” Physical Review B, vol. 110, no. 10. American
Physical Society, 2024.
ista: Brighi P, Ljubotina M. 2024. Anomalous transport in the kinetically constrained
quantum East-West model. Physical Review B. 110(10), L100304.
mla: Brighi, Pietro, and Marko Ljubotina. “Anomalous Transport in the Kinetically
Constrained Quantum East-West Model.” Physical Review B, vol. 110, no.
10, L100304, American Physical Society, 2024, doi:10.1103/PhysRevB.110.L100304.
short: P. Brighi, M. Ljubotina, Physical Review B 110 (2024).
corr_author: '1'
das_tickbox: '0'
date_created: 2024-09-22T22:01:42Z
date_published: 2024-09-11T00:00:00Z
date_updated: 2026-10-16T12:12:47Z
day: '11'
department:
- _id: MaSe
doi: 10.1103/PhysRevB.110.L100304
ec_funded: 1
external_id:
arxiv:
- '2405.02102'
isi:
- '001361617100003'
fulldoi: https://doi.org/10.1103/PhysRevB.110.L100304
intvolume: ' 110'
isi: 1
issue: '10'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.48550/arXiv.2405.02102
month: '09'
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 B
publication_identifier:
eissn:
- 2469-9969
issn:
- 2469-9950
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
researchdata_availability: no
scopus_import: '1'
status: public
supplementarymaterial: no
title: Anomalous transport in the kinetically constrained quantum East-West model
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 110
year: '2024'
...
---
_id: '15002'
abstract:
- lang: eng
text: "The lattice Schwinger model, the discrete version of QED in \r\n1\r\n+\r\n1\r\n
dimensions, is a well-studied test bench for lattice gauge theories. Here, we
study the fractal properties of this model. We reveal the self-similarity of the
ground state, which allows us to develop a recurrent procedure for finding the
ground-state wave functions and predicting ground-state energies. We present the
results of recurrently calculating ground-state wave functions using the fractal
Ansatz and automized software package for fractal image processing. In certain
parameter regimes, just a few terms are enough for our recurrent procedure to
predict ground-state energies close to the exact ones for several hundreds of
sites. Our findings pave the way to understanding the complexity of calculating
many-body wave functions in terms of their fractal properties as well as finding
new links between condensed matter and high-energy lattice models."
acknowledgement: "We thank A. Bargov, I. Khaymovich, and V. Tiunova for fruitful discussions
and for useful comments. M. C. B. thanks S. Kühn for discussions about the phase
structure of the model. A. K. F. thanks V. Gritsev and A. Garkun for insightful
comments. E. V. P., E. S. T., and A. K. F. are\r\nsupported by the RSF Grant No.
20-42-05002 (studying the fractal Ansatz) and the Roadmap on Quantum Computing (Contract
No. 868-1.3-15/15-2021, October 5, 2021; calculating on GS energies). A. K. F. thanks
the Priority 2030 program at the NIST “MISIS” under the project No. K1-2022-027.
M. C. B. was partly funded by the Deutsche Forschungsgemeinschaft (DFG, German Research
Foundation) under Germany’s Excellence Strategy—EXC-2111–390814868."
article_number: '050401'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Elena
full_name: Petrova, Elena
id: 0ac84990-897b-11ed-a09c-f5abb56a4ede
last_name: Petrova
- first_name: Egor S.
full_name: Tiunov, Egor S.
last_name: Tiunov
- first_name: Mari Carmen
full_name: Bañuls, Mari Carmen
last_name: Bañuls
- first_name: Aleksey K.
full_name: Fedorov, Aleksey K.
last_name: Fedorov
citation:
ama: Petrova E, Tiunov ES, Bañuls MC, Fedorov AK. Fractal states of the Schwinger
model. Physical Review Letters. 2024;132(5). doi:10.1103/PhysRevLett.132.050401
apa: Petrova, E., Tiunov, E. S., Bañuls, M. C., & Fedorov, A. K. (2024). Fractal
states of the Schwinger model. Physical Review Letters. American Physical
Society. https://doi.org/10.1103/PhysRevLett.132.050401
chicago: Petrova, Elena, Egor S. Tiunov, Mari Carmen Bañuls, and Aleksey K. Fedorov.
“Fractal States of the Schwinger Model.” Physical Review Letters. American
Physical Society, 2024. https://doi.org/10.1103/PhysRevLett.132.050401.
ieee: E. Petrova, E. S. Tiunov, M. C. Bañuls, and A. K. Fedorov, “Fractal states
of the Schwinger model,” Physical Review Letters, vol. 132, no. 5. American
Physical Society, 2024.
ista: Petrova E, Tiunov ES, Bañuls MC, Fedorov AK. 2024. Fractal states of the Schwinger
model. Physical Review Letters. 132(5), 050401.
mla: Petrova, Elena, et al. “Fractal States of the Schwinger Model.” Physical
Review Letters, vol. 132, no. 5, 050401, American Physical Society, 2024,
doi:10.1103/PhysRevLett.132.050401.
short: E. Petrova, E.S. Tiunov, M.C. Bañuls, A.K. Fedorov, Physical Review Letters
132 (2024).
das_tickbox: '0'
date_created: 2024-02-18T23:01:00Z
date_published: 2024-01-30T00:00:00Z
date_updated: 2026-10-16T12:12:00Z
day: '30'
department:
- _id: MaSe
doi: 10.1103/PhysRevLett.132.050401
external_id:
arxiv:
- '2201.10220'
isi:
- '001179276700003'
pmid:
- '38364163'
fulldoi: https://doi.org/10.1103/PhysRevLett.132.050401
intvolume: ' 132'
isi: 1
issue: '5'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.48550/arXiv.2201.10220
month: '01'
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'
researchdata_availability: no
scopus_import: '1'
status: public
supplementarymaterial: yes
title: Fractal states of the Schwinger model
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 132
year: '2024'
...
---
OA_place: publisher
_id: '17208'
abstract:
- lang: eng
text: "Can current quantum computers provide a speedup over their classical counterparts
for some kinds of problems? In this thesis, with a focus on ground state search/preparation,
we address some of the challenges that both quantum annealing and variational
quantum algorithms suffer from, hindering any possible practical speedup in comparison
to the best classical counterparts. \r\n\r\nIn the first part of the thesis, we
study the performance of quantum annealing for solving a particular combinatorial
optimization problem called 3-XOR satisfability (3-XORSAT). The classical problem
is mapped into a ground state search of a 3-local classical Hamiltonian $H_C$.
We consider how modifying the initial problem, by adding more interaction terms
to the corresponding Hamiltonian, leads to the emergence of a first-order phase
transition during the annealing process. This phenomenon causes the total annealing
duration, $T$, required to prepare the ground state of $H_C$ with a high probability
to increase exponentially with the size of the problem. Our findings indicate
that with the growing complexity of problem instances, the likelihood of encountering
first-order phase transitions also increases, making quantum annealing an impractical
solution for these types of combinatorial optimization problems.\r\n\r\nIn the
second part, we focus on the problem of barren plateaus in generic variational
quantum algorithms. Barren plateaus correspond to flat regions in the parameter
space where the gradient of the cost function is zero in expectation, and with
the variance decaying exponentially with the system size, thus obstructing an
efficient parameter optimization. We propose an algorithm to circumvent Barren
Plateaus by monitoring the entanglement entropy of k-local reduced density matrices,
alongside a method for estimating entanglement entropy via classical shadow tomography.
We illustrate the approach with the paradigmatic example of the variational quantum
eigensolver, and show that our algorithm effectively avoids barren plateaus in
the initialization as well as during the optimization stage. \r\n\r\nLastly, in
the last two Chapters of this thesis, we focus on the quantum approximate optimization
algorithm (QAOA), originally introduced as an algorithm for solving generic combinatorial
optimization problems in near-term quantum devices. Specifically, we focus on
how to develop rigorous initialization strategies with guarantee improvement.
Our motivation for this study lies in that for random initialization, the optimization
typically leads to local minima with poor performance. Our main result corresponds
to the analytical construction of index-1 saddle points or transition states,
stationary points with a single direction of descent, as a tool for systematically
exploring the QAOA optimization landscape. This leads us to propose a novel greedy
parameter initialization strategy that guarantees for the energy to decrease with
an increasing number of circuit layers. Furthermore, with precise estimates for
the negative Hessian eigenvalue and its eigenvector, we establish a lower bound
for energy improvement following a QAOA iteration."
acknowledged_ssus:
- _id: ScienComp
alternative_title:
- ISTA Thesis
article_processing_charge: No
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
citation:
ama: Medina Ramos RA. Exploring the optimization landscape of variational quantum
algorithms. 2024. doi:10.15479/at:ista:17208
apa: Medina Ramos, R. A. (2024). Exploring the optimization landscape of variational
quantum algorithms. Institute of Science and Technology Austria. https://doi.org/10.15479/at:ista:17208
chicago: Medina Ramos, Raimel A. “Exploring the Optimization Landscape of Variational
Quantum Algorithms.” Institute of Science and Technology Austria, 2024. https://doi.org/10.15479/at:ista:17208.
ieee: R. A. Medina Ramos, “Exploring the optimization landscape of variational quantum
algorithms,” Institute of Science and Technology Austria, 2024.
ista: Medina Ramos RA. 2024. Exploring the optimization landscape of variational
quantum algorithms. Institute of Science and Technology Austria.
mla: Medina Ramos, Raimel A. Exploring the Optimization Landscape of Variational
Quantum Algorithms. Institute of Science and Technology Austria, 2024, doi:10.15479/at:ista:17208.
short: R.A. Medina Ramos, Exploring the Optimization Landscape of Variational Quantum
Algorithms, Institute of Science and Technology Austria, 2024.
corr_author: '1'
das_tickbox: '0'
date_created: 2024-07-09T09:14:24Z
date_published: 2024-07-09T00:00:00Z
date_updated: 2026-10-16T12:14:52Z
day: '09'
ddc:
- '539'
degree_awarded: PhD
department:
- _id: GradSch
- _id: MaSe
doi: 10.15479/at:ista:17208
doi_confirm: '1'
ec_funded: 1
file:
- access_level: closed
checksum: 6f45273d04f4418bc2adc018baed0525
content_type: application/zip
creator: rmedinar
date_created: 2024-07-09T09:21:44Z
date_updated: 2024-07-10T11:34:09Z
file_id: '17212'
file_name: Raimel_Thesis-Final.zip
file_size: '14218691'
relation: source_file
- access_level: open_access
checksum: 6724a95bec772dbabc0111b9f08a805e
content_type: application/pdf
creator: rmedinar
date_created: 2024-07-17T09:23:24Z
date_updated: 2024-07-17T09:23:24Z
file_id: '17275'
file_name: Raimel_Thesis-20_pdfa.pdf
file_size: 11253627
relation: main_file
success: 1
file_date_updated: 2024-07-17T09:23:24Z
fulldoi: https://doi.org/10.15479/at:ista:17208
has_accepted_license: '1'
keyword:
- Quantum computing
- Variational Quantum Algorithms
- Optimization
language:
- iso: eng
month: '07'
oa: 1
oa_version: Published Version
page: '133'
project:
- _id: 23841C26-32DE-11EA-91FC-C7463DDC885E
call_identifier: H2020
grant_number: '850899'
name: 'Non-Ergodic Quantum Matter: Universality, Dynamics and Control'
publication_identifier:
issn:
- 2663-337X
publication_status: published
publisher: Institute of Science and Technology Austria
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- id: '11471'
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- id: '17222'
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status: public
researchdata_availability: no
status: public
supervisor:
- first_name: Maksym
full_name: Serbyn, Maksym
id: 47809E7E-F248-11E8-B48F-1D18A9856A87
last_name: Serbyn
orcid: 0000-0002-2399-5827
supplementarymaterial: no
title: Exploring the optimization landscape of variational quantum algorithms
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: 317138e5-6ab7-11ef-aa6d-ffef3953e345
year: '2024'
...
---
APC_amount: 4863,6 EUR
DOAJ_listed: '1'
OA_place: publisher
OA_type: gold
_id: '17493'
abstract:
- lang: eng
text: Estimating global properties of many-body quantum systems such as entropy
or bipartite entanglement is a notoriously difficult task, typically requiring
a number of measurements or classical postprocessing resources growing exponentially
in the system size. In this work, we address the problem of estimating global
entropies and mixed-state entanglement via partial-transposed (PT) moments and
show that efficient estimation strategies exist under the assumption that all
the spatial correlation lengths are finite. Focusing on one-dimensional systems,
we identify a set of approximate factorization conditions (AFCs) on the system
density matrix, which allow us to reconstruct entropies and PT moments from information
on local subsystems. This identification yields a simple and efficient strategy
for entropy and entanglement estimation. Our method could be implemented in different
ways, depending on how information on local subsystems is extracted. Focusing
on randomized measurements providing a practical and common measurement scheme,
we prove that our protocol requires only polynomially many measurements and postprocessing
operations, assuming that the state to be measured satisfies the AFCs. We prove
that the AFCs hold for finite-depth quantum-circuit states and translation-invariant
matrix-product density operators and provide numerical evidence that they are
satisfied in more general, physically interesting cases, including thermal states
of local Hamiltonians. We argue that our method could be practically useful to
detect bipartite mixed-state entanglement for large numbers of qubits available
in today’s quantum platforms.
acknowledgement: B. V. acknowledges funding from the Austrian Science Foundation (Grant
No. FWF, P 32597 N), from the French National Research Agency via the JCJC project
QRand (Grant No. ANR-20-CE47-0005), and via the research programs Plan France 2030
EPIQ (Grant No. ANR-22-PETQ-0007), QUBITAF (Grant No. ANR-22-PETQ-0004), and HQI
(Grant No. ANR-22-PNCQ-0002). M. L. and M. S. acknowledge support by the European
Research Council under the European Union’s Horizon 2020 research and innovation
program (Grant Agreement No. 850899). M. S. acknowledges the hospitality of KITP
supported in part by the National Science Foundation under Grants No. NSF PHY-1748958
and No. NSF PHY-2309135. J. I. C. is supported by the Hightech Agenda Bayern Plus
through the Munich Quantum Valley and the German Federal Ministry of Education and
Research through EQUAHUMO (Grant No. 13N16066). P. Z. acknowledges funding from
the European Union’s Horizon 2020 research and innovation program under Grant Agreement
No. 101113690 (PASQuanS2.1).
article_number: '031035'
article_processing_charge: Yes
article_type: original
arxiv: 1
author:
- first_name: Benoît
full_name: Vermersch, Benoît
last_name: Vermersch
- first_name: Marko
full_name: Ljubotina, Marko
id: F75EE9BE-5C90-11EA-905D-16643DDC885E
last_name: Ljubotina
orcid: 0000-0003-0038-7068
- first_name: J. Ignacio
full_name: Cirac, J. Ignacio
last_name: Cirac
- first_name: Peter
full_name: Zoller, Peter
last_name: Zoller
- first_name: Maksym
full_name: Serbyn, Maksym
id: 47809E7E-F248-11E8-B48F-1D18A9856A87
last_name: Serbyn
orcid: 0000-0002-2399-5827
- first_name: Lorenzo
full_name: Piroli, Lorenzo
last_name: Piroli
citation:
ama: Vermersch B, Ljubotina M, Cirac JI, Zoller P, Serbyn M, Piroli L. Many-body
entropies and entanglement from polynomially many local measurements. Physical
Review X. 2024;14(3). doi:10.1103/physrevx.14.031035
apa: Vermersch, B., Ljubotina, M., Cirac, J. I., Zoller, P., Serbyn, M., & Piroli,
L. (2024). Many-body entropies and entanglement from polynomially many local measurements.
Physical Review X. American Physical Society. https://doi.org/10.1103/physrevx.14.031035
chicago: Vermersch, Benoît, Marko Ljubotina, J. Ignacio Cirac, Peter Zoller, Maksym
Serbyn, and Lorenzo Piroli. “Many-Body Entropies and Entanglement from Polynomially
Many Local Measurements.” Physical Review X. American Physical Society,
2024. https://doi.org/10.1103/physrevx.14.031035.
ieee: B. Vermersch, M. Ljubotina, J. I. Cirac, P. Zoller, M. Serbyn, and L. Piroli,
“Many-body entropies and entanglement from polynomially many local measurements,”
Physical Review X, vol. 14, no. 3. American Physical Society, 2024.
ista: Vermersch B, Ljubotina M, Cirac JI, Zoller P, Serbyn M, Piroli L. 2024. Many-body
entropies and entanglement from polynomially many local measurements. Physical
Review X. 14(3), 031035.
mla: Vermersch, Benoît, et al. “Many-Body Entropies and Entanglement from Polynomially
Many Local Measurements.” Physical Review X, vol. 14, no. 3, 031035, American
Physical Society, 2024, doi:10.1103/physrevx.14.031035.
short: B. Vermersch, M. Ljubotina, J.I. Cirac, P. Zoller, M. Serbyn, L. Piroli,
Physical Review X 14 (2024).
das_tickbox: '0'
date_created: 2024-09-04T18:57:11Z
date_published: 2024-08-26T00:00:00Z
date_updated: 2026-10-16T12:15:28Z
day: '26'
ddc:
- '530'
department:
- _id: MaSe
doi: 10.1103/physrevx.14.031035
ec_funded: 1
external_id:
arxiv:
- '2311.08108'
isi:
- '001299667100002'
file:
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creator: cchlebak
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file_size: 1408836
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intvolume: ' 14'
isi: 1
issue: '3'
language:
- iso: eng
month: '08'
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 X
publication_identifier:
issn:
- 2160-3308
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
researchdata_availability: no
scopus_import: '1'
status: public
supplementarymaterial: yes
title: Many-body entropies and entanglement from polynomially many local measurements
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'
...
---
_id: '15367'
abstract:
- lang: eng
text: Two-dimensional semiconductor-superconductor heterostructures form the foundation
of numerous nanoscale physical systems. However, measuring the properties of such
heterostructures, and characterizing the semiconductor in-situ is challenging.
A recent experimental study by [Phys. Rev. Lett. 128, 107701 (2022)] was able
to probe the semiconductor within the heterostructure using microwave measurements
of the superfluid density. This work revealed a rapid depletion of superfluid
density in semiconductor, caused by the in-plane magnetic field which in presence
of spin-orbit coupling creates so-called Bogoliubov Fermi surfaces. The experimental
work used a simplified theoretical model that neglected the presence of non-magnetic
disorder in the semiconductor, hence describing the data only qualitatively. Motivated
by experiments, we introduce a theoretical model describing a disordered semiconductor
with strong spin-orbit coupling that is proximitized by a superconductor. Our
model provides specific predictions for the density of states and superfluid density.
Presence of disorder leads to the emergence of a gapless superconducting phase,
that may be viewed as a manifestation of Bogoliubov Fermi surface. When applied
to real experimental data, our model showcases excellent quantitative agreement,
enabling the extraction of material parameters such as mean free path and mobility,
and estimating g-tensor after taking into account the orbital contribution of
magnetic field. Our model can be used to probe in-situ parameters of other superconductor-semiconductor
heterostructures and can be further extended to give access to transport properties.
acknowledgement: "We acknowledge useful discussions with M. Geier, A. Levchenko, B.
Ramshaw, T. Scaffidi, and\r\nJ. Shabani. This research was funded by the Austrian
Science Fund (FWF) F 86.\r\nFor the purpose of open access, authors have applied
a CC BY public copyright licence to any\r\nAuthor Accepted Manuscript version arising
from this submission. MS acknowledges hospitality of KITP supported in part by the
National Science Foundation under Grants No. NSF\r\nPHY-1748958 and PHY-2309135.
APH acknowledges the support of the NOMIS foundation."
article_number: '115'
article_processing_charge: Yes
article_type: original
arxiv: 1
author:
- first_name: Serafim
full_name: Babkin, Serafim
id: 41e64307-6672-11ee-b9ad-cc7a0075a479
last_name: Babkin
orcid: 0009-0003-7382-8036
- first_name: Andrew P
full_name: Higginbotham, Andrew P
id: 4AD6785A-F248-11E8-B48F-1D18A9856A87
last_name: Higginbotham
orcid: 0000-0003-2607-2363
- first_name: Maksym
full_name: Serbyn, Maksym
id: 47809E7E-F248-11E8-B48F-1D18A9856A87
last_name: Serbyn
orcid: 0000-0002-2399-5827
citation:
ama: Babkin S, Higginbotham AP, Serbyn M. Proximity-induced gapless superconductivity
in two-dimensional Rashba semiconductor in magnetic field. SciPost Physics.
2024;16(5). doi:10.21468/scipostphys.16.5.115
apa: Babkin, S., Higginbotham, A. P., & Serbyn, M. (2024). Proximity-induced
gapless superconductivity in two-dimensional Rashba semiconductor in magnetic
field. SciPost Physics. SciPost Foundation. https://doi.org/10.21468/scipostphys.16.5.115
chicago: Babkin, Serafim, Andrew P Higginbotham, and Maksym Serbyn. “Proximity-Induced
Gapless Superconductivity in Two-Dimensional Rashba Semiconductor in Magnetic
Field.” SciPost Physics. SciPost Foundation, 2024. https://doi.org/10.21468/scipostphys.16.5.115.
ieee: S. Babkin, A. P. Higginbotham, and M. Serbyn, “Proximity-induced gapless superconductivity
in two-dimensional Rashba semiconductor in magnetic field,” SciPost Physics,
vol. 16, no. 5. SciPost Foundation, 2024.
ista: Babkin S, Higginbotham AP, Serbyn M. 2024. Proximity-induced gapless superconductivity
in two-dimensional Rashba semiconductor in magnetic field. SciPost Physics. 16(5),
115.
mla: Babkin, Serafim, et al. “Proximity-Induced Gapless Superconductivity in Two-Dimensional
Rashba Semiconductor in Magnetic Field.” SciPost Physics, vol. 16, no.
5, 115, SciPost Foundation, 2024, doi:10.21468/scipostphys.16.5.115.
short: S. Babkin, A.P. Higginbotham, M. Serbyn, SciPost Physics 16 (2024).
corr_author: '1'
das_tickbox: '0'
date_created: 2024-05-06T09:02:18Z
date_published: 2024-05-01T00:00:00Z
date_updated: 2026-10-16T12:15:53Z
day: '01'
ddc:
- '530'
department:
- _id: MaSe
- _id: AnHi
doi: 10.21468/scipostphys.16.5.115
external_id:
arxiv:
- '2311.09347'
isi:
- '001215855200002'
file:
- access_level: open_access
checksum: f999204856417dcf5a736ac8df432b96
content_type: application/pdf
creator: dernst
date_created: 2024-05-07T12:58:47Z
date_updated: 2024-05-07T12:58:47Z
file_id: '15369'
file_name: 2024_SciPostPhys_Babkin.pdf
file_size: 2733685
relation: main_file
success: 1
file_date_updated: 2024-05-07T12:58:47Z
fulldoi: https://doi.org/10.21468/scipostphys.16.5.115
has_accepted_license: '1'
intvolume: ' 16'
isi: 1
issue: '5'
language:
- iso: eng
month: '05'
oa: 1
oa_version: Published Version
project:
- _id: eb9b30ac-77a9-11ec-83b8-871f581d53d2
name: Protected states of quantum matter
- _id: 34a7f947-11ca-11ed-8bc3-c5dc2bbaae25
grant_number: F8609
name: 'Center for Correlated Quantum Materials and Solid State Quantum Systems: Probing
topology in circuits and quantum materials'
publication: SciPost Physics
publication_identifier:
issn:
- 2542-4653
publication_status: published
publisher: SciPost Foundation
quality_controlled: '1'
researchdata_availability: no
scopus_import: '1'
status: public
supplementarymaterial: no
title: Proximity-induced gapless superconductivity in two-dimensional Rashba semiconductor
in magnetic field
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: '2024'
...
---
OA_place: repository
OA_type: green
_id: '18627'
abstract:
- lang: eng
text: In contrast with extended Bloch waves, a single particle can become spatially
localized due to the so-called skin effect originating from non-Hermitian pumping.
Here we show that in kinetically constrained many-body systems, the skin effect
can instead manifest as dynamical amplification within the Fock space, beyond
the intuitively expected and previously studied particle localization and clustering.
We exemplify this non-Hermitian Fock skin effect in an asymmetric version of the
PXP model and show that it gives rise to ergodicity-breaking eigenstates—the non-Hermitian
analogs of quantum many-body scars. A distinguishing feature of these non-Hermitian
scars is their enhanced robustness against external disorders. We propose an experimental
realization of the non-Hermitian scar enhancement in a tilted Bose-Hubbard optical
lattice with laser-induced loss. Additionally, we implement digital simulations
of such scar enhancement on the IBM quantum processor. Our results show that the
Fock skin effect provides a powerful tool for creating robust nonergodic states
in generic open quantum systems.
acknowledgement: F. Q. and C. H. L. acknowledge support from the QEP2.0 Grant from
the Singapore National Research Foundation (Grant No. NRF2021-QEP2-02-P09) and the
Singapore MOE Tier-II Grant (Grant No. MOE-T2EP50222-0003). J.-Y. D. and Z. P. acknowledge
support by the Leverhulme Trust Research Leadership Award RL-2019-015. This project
has received funding from the European Union’s Horizon 2020 research and innovation
programme under the Marie Skłodowska-Curie Grant Agreement No. 101034413. This research
was supported in part by Grant No. NSF PHY-2309135 to the Kavli Institute for Theoretical
Physics (KITP). We acknowledge the use of IBM Quantum services for this work. The
views expressed are those of the authors and do not reflect the official policy
or position of IBM or the IBM Quantum team.
article_number: '216601'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Ruizhe
full_name: Shen, Ruizhe
last_name: Shen
- first_name: Fang
full_name: Qin, Fang
last_name: Qin
- first_name: Jean-Yves Marc
full_name: Desaules, Jean-Yves Marc
id: 6c292945-a610-11ed-9eec-c3be1ad62a80
last_name: Desaules
orcid: 0000-0002-3749-6375
- first_name: Zlatko
full_name: Papić, Zlatko
last_name: Papić
- first_name: Ching Hua
full_name: Lee, Ching Hua
last_name: Lee
citation:
ama: Shen R, Qin F, Desaules J-YM, Papić Z, Lee CH. Enhanced many-body quantum scars
from the non-hermitian fock skin effect. Physical Review Letters. 2024;133(21).
doi:10.1103/PhysRevLett.133.216601
apa: Shen, R., Qin, F., Desaules, J.-Y. M., Papić, Z., & Lee, C. H. (2024).
Enhanced many-body quantum scars from the non-hermitian fock skin effect. Physical
Review Letters. American Physical Society. https://doi.org/10.1103/PhysRevLett.133.216601
chicago: Shen, Ruizhe, Fang Qin, Jean-Yves Marc Desaules, Zlatko Papić, and Ching
Hua Lee. “Enhanced Many-Body Quantum Scars from the Non-Hermitian Fock Skin Effect.”
Physical Review Letters. American Physical Society, 2024. https://doi.org/10.1103/PhysRevLett.133.216601.
ieee: R. Shen, F. Qin, J.-Y. M. Desaules, Z. Papić, and C. H. Lee, “Enhanced many-body
quantum scars from the non-hermitian fock skin effect,” Physical Review Letters,
vol. 133, no. 21. American Physical Society, 2024.
ista: Shen R, Qin F, Desaules J-YM, Papić Z, Lee CH. 2024. Enhanced many-body quantum
scars from the non-hermitian fock skin effect. Physical Review Letters. 133(21),
216601.
mla: Shen, Ruizhe, et al. “Enhanced Many-Body Quantum Scars from the Non-Hermitian
Fock Skin Effect.” Physical Review Letters, vol. 133, no. 21, 216601, American
Physical Society, 2024, doi:10.1103/PhysRevLett.133.216601.
short: R. Shen, F. Qin, J.-Y.M. Desaules, Z. Papić, C.H. Lee, Physical Review Letters
133 (2024).
das_tickbox: '1'
dataavailabilitystatement: The data supporting the plots within this paper are available
at 10.15479/AT:ISTA:17471
date_created: 2024-12-08T23:01:55Z
date_published: 2024-11-22T00:00:00Z
date_updated: 2026-10-16T12:14:03Z
day: '22'
department:
- _id: MaSe
doi: 10.1103/PhysRevLett.133.216601
ec_funded: 1
external_id:
arxiv:
- '2403.02395'
isi:
- '001369697800005'
pmid:
- '39642519'
fulldoi: https://doi.org/10.1103/PhysRevLett.133.216601
intvolume: ' 133'
isi: 1
issue: '21'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.48550/arXiv.2403.02395
month: '11'
oa: 1
oa_version: Preprint
pmid: 1
project:
- _id: fc2ed2f7-9c52-11eb-aca3-c01059dda49c
call_identifier: H2020
grant_number: '101034413'
name: 'IST-BRIDGE: International postdoctoral program'
publication: Physical Review Letters
publication_identifier:
eissn:
- 1079-7114
issn:
- 0031-9007
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
related_material:
record:
- id: '17471'
relation: research_data
status: public
researchdata_availability: yes
scopus_import: '1'
status: public
supplementarymaterial: yes
title: Enhanced many-body quantum scars from the non-hermitian fock skin effect
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 133
year: '2024'
...
---
OA_place: publisher
OA_type: hybrid
_id: '18923'
abstract:
- lang: eng
text: 'Combinatorial optimization is a challenging problem applicable in a wide
range of fields from logistics to finance. Recently, quantum computing has been
used to attempt to solve these problems using a range of algorithms, including
parameterized quantum circuits, adiabatic protocols, and quantum annealing. These
solutions typically have several challenges: 1) there is little to no performance
gain over classical methods; 2) not all constraints and objectives may be efficiently
encoded in the quantum ansatz; and 3) the solution domain of the objective function
may not be the same as the bit strings of measurement outcomes. This work presents
“nonnative hybrid algorithms”: a framework to overcome these challenges by integrating
quantum and classical resources with a hybrid approach. By designing nonnative
quantum variational anosatzes that inherit some but not all problem structure,
measurement outcomes from the quantum computer can act as a resource to be used
by classical routines to indirectly compute optimal solutions, partially overcoming
the challenges of contemporary quantum optimization approaches. These methods
are demonstrated using a publicly available neutral-atom quantum computer on two
simple problems of Max k-Cut and maximum independent set. We find improvements
in solution quality when comparing the hybrid algorithm to its “no quantum” version,
a demonstration of a “comparative advantage.”'
acknowledgement: "The authors would like to thank Alexander Keesling, Maddie Cain,
Nate Gemelke, and Phillip Weinberg for helpful discussions and Danylo Lykov who
had early contributions to this work.\r\n10.13039/100000185-Defense Advanced Research
Projects Agency Noisy Intermediate-Scale Quantum Devices (Grant Number: W911NF2010021),
DARPA Small Business Technology Transfer program (Grant Number: 140D0422C0035)."
article_processing_charge: Yes (in subscription journal)
article_type: original
author:
- first_name: Jonathan
full_name: Wurtz, Jonathan
last_name: Wurtz
- first_name: Stefan
full_name: Sack, Stefan
id: dd622248-f6e0-11ea-865d-ce382a1c81a5
last_name: Sack
orcid: 0000-0001-5400-8508
- first_name: Sheng-Tao
full_name: Wang, Sheng-Tao
last_name: Wang
citation:
ama: Wurtz J, Sack S, Wang S-T. Solving nonnative combinatorial optimization problems
using hybrid quantum–classical algorithms. IEEE Transactions on Quantum Engineering.
2024;5:1-14. doi:10.1109/tqe.2024.3443660
apa: Wurtz, J., Sack, S., & Wang, S.-T. (2024). Solving nonnative combinatorial
optimization problems using hybrid quantum–classical algorithms. IEEE Transactions
on Quantum Engineering. IEEE. https://doi.org/10.1109/tqe.2024.3443660
chicago: Wurtz, Jonathan, Stefan Sack, and Sheng-Tao Wang. “Solving Nonnative Combinatorial
Optimization Problems Using Hybrid Quantum–Classical Algorithms.” IEEE Transactions
on Quantum Engineering. IEEE, 2024. https://doi.org/10.1109/tqe.2024.3443660.
ieee: J. Wurtz, S. Sack, and S.-T. Wang, “Solving nonnative combinatorial optimization
problems using hybrid quantum–classical algorithms,” IEEE Transactions on Quantum
Engineering, vol. 5. IEEE, pp. 1–14, 2024.
ista: Wurtz J, Sack S, Wang S-T. 2024. Solving nonnative combinatorial optimization
problems using hybrid quantum–classical algorithms. IEEE Transactions on Quantum
Engineering. 5, 1–14.
mla: Wurtz, Jonathan, et al. “Solving Nonnative Combinatorial Optimization Problems
Using Hybrid Quantum–Classical Algorithms.” IEEE Transactions on Quantum Engineering,
vol. 5, IEEE, 2024, pp. 1–14, doi:10.1109/tqe.2024.3443660.
short: J. Wurtz, S. Sack, S.-T. Wang, IEEE Transactions on Quantum Engineering 5
(2024) 1–14.
das_tickbox: '0'
date_created: 2025-01-27T15:00:44Z
date_published: 2024-08-14T00:00:00Z
date_updated: 2026-10-16T12:15:09Z
day: '14'
ddc:
- '530'
department:
- _id: MaSe
doi: 10.1109/tqe.2024.3443660
file:
- access_level: open_access
checksum: 19b84e35cba05bde72bfe7e0b54c3e6c
content_type: application/pdf
creator: dernst
date_created: 2025-01-27T15:03:09Z
date_updated: 2025-01-27T15:03:09Z
file_id: '18924'
file_name: 2024_IEEEQuantumComputing_Wurtz.pdf
file_size: 1753095
relation: main_file
success: 1
file_date_updated: 2025-01-27T15:03:09Z
fulldoi: https://doi.org/10.1109/tqe.2024.3443660
has_accepted_license: '1'
intvolume: ' 5'
language:
- iso: eng
month: '08'
oa: 1
oa_version: Published Version
page: 1-14
publication: IEEE Transactions on Quantum Engineering
publication_identifier:
issn:
- 2689-1808
publication_status: published
publisher: IEEE
quality_controlled: '1'
researchdata_availability: no
scopus_import: '1'
status: public
supplementarymaterial: no
title: Solving nonnative combinatorial optimization problems using hybrid quantum–classical
algorithms
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: 5
year: '2024'
...
---
OA_place: repository
OA_type: green
_id: '14845'
abstract:
- lang: eng
text: We study a linear rotor in a bosonic bath within the angulon formalism. Our
focus is on systems where isotropic or anisotropic impurity-boson interactions
support a shallow bound state. To study the fate of the angulon in the vicinity
of bound-state formation, we formulate a beyond-linear-coupling angulon Hamiltonian.
First, we use it to study attractive, spherically symmetric impurity-boson interactions
for which the linear rotor can be mapped onto a static impurity. The well-known
polaron formalism provides an adequate description in this limit. Second, we consider
anisotropic potentials, and show that the presence of a shallow bound state with
pronounced anisotropic character leads to a many-body instability that washes
out the angulon dynamics.
acknowledgement: "We would like to thank G. Bighin, I. Cherepanov, E. Paerschke, and
E. Yakaboylu for insightful discussions on a wide range of topics. This work has
been supported by the European Research Council (ERC) Starting Grant No. 801770
(ANGULON). A.G. and A.G.V. acknowledge support from the European Union’s Horizon
2020 research and innovation\r\nprogram under the Marie Skłodowska-Curie Grant Agreement
No. 754411. Numerical calculations were performed on the Euler cluster managed by
the HPC team at ETH Zurich.\r\nR.S. acknowledges support by the Deutsche Forschungsgemeinschaft
under Germany’s Excellence Strategy Grant No. EXC 2181/1-390900948 (the Heidelberg
STRUCTURES Excellence Cluster). T.D. acknowledges support from the Isaac Newton
Studentship and the Science and Technology Facilities Council under Grant No. ST/V50659X/1."
article_number: '014102'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Tibor
full_name: Dome, Tibor
id: 7e3293e2-b9dc-11ee-97a9-cd73400f6994
last_name: Dome
orcid: 0000-0003-2586-3702
- first_name: Artem
full_name: Volosniev, Artem
id: 37D278BC-F248-11E8-B48F-1D18A9856A87
last_name: Volosniev
orcid: 0000-0003-0393-5525
- first_name: Areg
full_name: Ghazaryan, Areg
id: 4AF46FD6-F248-11E8-B48F-1D18A9856A87
last_name: Ghazaryan
orcid: 0000-0001-9666-3543
- first_name: Laleh
full_name: Safari, Laleh
id: 3C325E5E-F248-11E8-B48F-1D18A9856A87
last_name: Safari
- first_name: Richard
full_name: Schmidt, Richard
last_name: Schmidt
- first_name: Mikhail
full_name: Lemeshko, Mikhail
id: 37CB05FA-F248-11E8-B48F-1D18A9856A87
last_name: Lemeshko
orcid: 0000-0002-6990-7802
citation:
ama: Dome T, Volosniev A, Ghazaryan A, Safari L, Schmidt R, Lemeshko M. Linear rotor
in an ideal Bose gas near the threshold for binding. Physical Review B.
2024;109(1). doi:10.1103/PhysRevB.109.014102
apa: Dome, T., Volosniev, A., Ghazaryan, A., Safari, L., Schmidt, R., & Lemeshko,
M. (2024). Linear rotor in an ideal Bose gas near the threshold for binding. Physical
Review B. American Physical Society. https://doi.org/10.1103/PhysRevB.109.014102
chicago: Dome, Tibor, Artem Volosniev, Areg Ghazaryan, Laleh Safari, Richard Schmidt,
and Mikhail Lemeshko. “Linear Rotor in an Ideal Bose Gas near the Threshold for
Binding.” Physical Review B. American Physical Society, 2024. https://doi.org/10.1103/PhysRevB.109.014102.
ieee: T. Dome, A. Volosniev, A. Ghazaryan, L. Safari, R. Schmidt, and M. Lemeshko,
“Linear rotor in an ideal Bose gas near the threshold for binding,” Physical
Review B, vol. 109, no. 1. American Physical Society, 2024.
ista: Dome T, Volosniev A, Ghazaryan A, Safari L, Schmidt R, Lemeshko M. 2024. Linear
rotor in an ideal Bose gas near the threshold for binding. Physical Review B.
109(1), 014102.
mla: Dome, Tibor, et al. “Linear Rotor in an Ideal Bose Gas near the Threshold for
Binding.” Physical Review B, vol. 109, no. 1, 014102, American Physical
Society, 2024, doi:10.1103/PhysRevB.109.014102.
short: T. Dome, A. Volosniev, A. Ghazaryan, L. Safari, R. Schmidt, M. Lemeshko,
Physical Review B 109 (2024).
corr_author: '1'
das_tickbox: '0'
date_created: 2024-01-21T23:00:57Z
date_published: 2024-01-01T00:00:00Z
date_updated: 2026-10-16T12:16:12Z
day: '01'
department:
- _id: MiLe
doi: 10.1103/PhysRevB.109.014102
ec_funded: 1
external_id:
arxiv:
- '2308.03852'
isi:
- '001172754500002'
fulldoi: https://doi.org/10.1103/PhysRevB.109.014102
intvolume: ' 109'
isi: 1
issue: '1'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.48550/arXiv.2308.03852
month: '01'
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'
- _id: 260C2330-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '754411'
name: ISTplus - Postdoctoral Fellowships
publication: Physical Review B
publication_identifier:
eissn:
- 2469-9969
issn:
- 2469-9950
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
researchdata_availability: no
scopus_import: '1'
status: public
supplementarymaterial: no
title: Linear rotor in an ideal Bose gas near the threshold for binding
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 109
year: '2024'
...
---
_id: '17471'
abstract:
- lang: eng
text: Mechanisms for suppressing thermalization in disorder-free many-body systems,
such as Hilbert space fragmentation and quantum many-body scars, have recently
attracted much interest in foundations of quantum statistical physics and potential
quantum information processing applications. However, their sensitivity to realistic
effects such as finite temperature remains largely unexplored. Here, we have utilized
IBM's Kolkata quantum processor to demonstrate an unexpected robustness of quantum
many-body scars at finite temperatures when the system is prepared in a thermal
Gibbs ensemble. We identify such robustness in the PXP model, which describes
quantum many-body scars in experimental systems of Rydberg atom arrays and ultracold
atoms in tilted Bose--Hubbard optical lattices. By contrast, other theoretical
models which host exact quantum many-body scars are found to lack such robustness,
and their scarring properties quickly decay with temperature. Our study sheds
light on the important differences between scarred models in terms of their algebraic
structures, which impacts their resilience to finite temperature.
article_processing_charge: No
author:
- first_name: Jean-Yves Marc
full_name: Desaules, Jean-Yves Marc
id: 6c292945-a610-11ed-9eec-c3be1ad62a80
last_name: Desaules
orcid: 0000-0002-3749-6375
citation:
ama: Desaules J-YM. Data for “Enhanced many-body quantum scars from the non-Hermitian
Fock skin effect.” 2024. doi:10.15479/AT:ISTA:17471
apa: Desaules, J.-Y. M. (2024). Data for “Enhanced many-body quantum scars from
the non-Hermitian Fock skin effect.” Institute of Science and Technology Austria.
https://doi.org/10.15479/AT:ISTA:17471
chicago: Desaules, Jean-Yves Marc. “Data for ‘Enhanced Many-Body Quantum Scars from
the Non-Hermitian Fock Skin Effect.’” Institute of Science and Technology Austria,
2024. https://doi.org/10.15479/AT:ISTA:17471.
ieee: J.-Y. M. Desaules, “Data for ‘Enhanced many-body quantum scars from the non-Hermitian
Fock skin effect.’” Institute of Science and Technology Austria, 2024.
ista: Desaules J-YM. 2024. Data for ‘Enhanced many-body quantum scars from the non-Hermitian
Fock skin effect’, Institute of Science and Technology Austria, 10.15479/AT:ISTA:17471.
mla: Desaules, Jean-Yves Marc. Data for “Enhanced Many-Body Quantum Scars from
the Non-Hermitian Fock Skin Effect.” Institute of Science and Technology Austria,
2024, doi:10.15479/AT:ISTA:17471.
short: J.-Y.M. Desaules, (2024).
contributor:
- contributor_type: researcher
first_name: Ruizhe
last_name: Shen
- contributor_type: researcher
first_name: Fang
last_name: Qin
- contributor_type: researcher
first_name: Jean-Yves Marc
id: 6c292945-a610-11ed-9eec-c3be1ad62a80
last_name: Desaules
orcid: 0000-0002-3749-6375
- contributor_type: researcher
first_name: Zlatko
last_name: Papić
- contributor_type: researcher
first_name: Ching Hua
last_name: Lee
date_created: 2024-08-30T12:59:43Z
date_published: 2024-08-30T00:00:00Z
date_updated: 2026-10-16T12:14:03Z
day: '30'
ddc:
- '530'
department:
- _id: MaSe
doi: 10.15479/AT:ISTA:17471
ec_funded: 1
file:
- access_level: open_access
checksum: 2bd49ce5a63f1951c1ed3d89cce4fe27
content_type: application/zip
creator: jdesaule
date_created: 2024-08-30T12:55:37Z
date_updated: 2024-08-30T12:55:37Z
file_id: '17472'
file_name: FiguresData.zip
file_size: 322400
relation: main_file
success: 1
- access_level: open_access
checksum: c2ba113a241e98c394cc3ca21f3fa126
content_type: text/plain
creator: jdesaule
date_created: 2024-08-30T13:19:57Z
date_updated: 2024-08-30T13:19:57Z
file_id: '17473'
file_name: readme.txt
file_size: 1368
relation: main_file
success: 1
file_date_updated: 2024-08-30T13:19:57Z
fulldoi: https://doi.org/10.15479/AT:ISTA:17471
has_accepted_license: '1'
keyword:
- quantum many-body scars
- non-equilibrium physics
- non-Hermitian physics
license: https://creativecommons.org/licenses/by-nc/4.0/
month: '08'
oa: 1
oa_version: Published Version
project:
- _id: fc2ed2f7-9c52-11eb-aca3-c01059dda49c
call_identifier: H2020
grant_number: '101034413'
name: 'IST-BRIDGE: International postdoctoral program'
publisher: Institute of Science and Technology Austria
related_material:
record:
- id: '18627'
relation: used_in_publication
status: public
status: public
title: Data for "Enhanced many-body quantum scars from the non-Hermitian Fock skin
effect"
tmp:
image: /images/cc_by_nc.png
legal_code_url: https://creativecommons.org/licenses/by-nc/4.0/legalcode
name: Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)
short: CC BY-NC (4.0)
type: research_data
user_id: 68b8ca59-c5b3-11ee-8790-cd641c68093d
year: '2024'
...
---
OA_place: repository
_id: '17222'
abstract:
- lang: eng
text: "The quantum approximate optimization algorithm (QAOA) uses a quantum computer\r\nto
implement a variational method with $2p$ layers of alternating unitary\r\noperators,
optimized by a classical computer to minimize a cost function. While\r\nrigorous
performance guarantees exist for the QAOA at small depths $p$, the\r\nbehavior
at large depths remains less clear, though simulations suggest\r\nexponentially
fast convergence for certain problems. In this work, we gain\r\ninsights into
the deep QAOA using an analytic expansion of the cost function\r\naround transition
states. Transition states are constructed in a recursive\r\nmanner: from the local
minima of the QAOA with $p$ layers we obtain transition\r\nstates of the QAOA
with $p+1$ layers, which are stationary points characterized\r\nby a unique direction
of negative curvature. We construct an analytic estimate\r\nof the negative curvature
and the corresponding direction in parameter space at\r\neach transition state.
The expansion of the QAOA cost function along the\r\nnegative direction to the
quartic order gives a lower bound of the QAOA cost\r\nfunction improvement. We
provide physical intuition behind the analytic\r\nexpressions for the local curvature
and quartic expansion coefficient. Our\r\nnumerical study confirms the accuracy
of our approximations and reveals that\r\nthe obtained bound and the true value
of the QAOA cost function gain have a\r\ncharacteristic exponential decrease with
the number of layers $p$, with the\r\nbound decreasing more rapidly. Our study
establishes an analytical method for\r\nrecursively studying the QAOA that is
applicable in the regime of high circuit\r\ndepth."
article_number: '2405.10125'
article_processing_charge: No
arxiv: 1
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. A recursive lower bound on the energy improvement
of the quantum approximate optimization algorithm. arXiv. doi:10.48550/arXiv.2405.10125
apa: Medina Ramos, R. A., & Serbyn, M. (n.d.). A recursive lower bound on the
energy improvement of the quantum approximate optimization algorithm. arXiv.
https://doi.org/10.48550/arXiv.2405.10125
chicago: Medina Ramos, Raimel A, and Maksym Serbyn. “A Recursive Lower Bound on
the Energy Improvement of the Quantum Approximate Optimization Algorithm.” ArXiv,
n.d. https://doi.org/10.48550/arXiv.2405.10125.
ieee: R. A. Medina Ramos and M. Serbyn, “A recursive lower bound on the energy improvement
of the quantum approximate optimization algorithm,” arXiv. .
ista: Medina Ramos RA, Serbyn M. A recursive lower bound on the energy improvement
of the quantum approximate optimization algorithm. arXiv, 2405.10125.
mla: Medina Ramos, Raimel A., and Maksym Serbyn. “A Recursive Lower Bound on the
Energy Improvement of the Quantum Approximate Optimization Algorithm.” ArXiv,
2405.10125, doi:10.48550/arXiv.2405.10125.
short: R.A. Medina Ramos, M. Serbyn, ArXiv (n.d.).
corr_author: '1'
das_tickbox: '0'
date_created: 2024-07-10T13:12:09Z
date_published: 2024-05-16T00:00:00Z
date_updated: 2026-10-16T12:14:52Z
day: '16'
department:
- _id: MaSe
doi: 10.48550/arXiv.2405.10125
external_id:
arxiv:
- '2405.10125'
fulldoi: https://doi.org/10.48550/arXiv.2405.10125
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.48550/arXiv.2405.10125
month: '05'
oa: 1
oa_version: Preprint
publication: arXiv
publication_status: draft
related_material:
record:
- id: '17208'
relation: dissertation_contains
status: public
researchdata_availability: no
status: public
supplementarymaterial: yes
title: A recursive lower bound on the energy improvement of the quantum approximate
optimization algorithm
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: 317138e5-6ab7-11ef-aa6d-ffef3953e345
year: '2024'
...
---
OA_type: closed access
_id: '18616'
abstract:
- lang: eng
text: By patterning an ultrathin layered structure with tiny wells, physicists have
created and imaged peculiar states known as quantum scars — revealing behaviour
that could be used to boost the performance of electronic devices.
article_processing_charge: No
article_type: letter_note
author:
- first_name: Dmitry
full_name: Abanin, Dmitry
last_name: Abanin
- first_name: Maksym
full_name: Serbyn, Maksym
id: 47809E7E-F248-11E8-B48F-1D18A9856A87
last_name: Serbyn
orcid: 0000-0002-2399-5827
citation:
ama: Abanin D, Serbyn M. Quantum scars make their mark in graphene. Nature.
2024;635(8040):825-826. doi:10.1038/d41586-024-03649-y
apa: Abanin, D., & Serbyn, M. (2024). Quantum scars make their mark in graphene.
Nature. Springer Nature. https://doi.org/10.1038/d41586-024-03649-y
chicago: Abanin, Dmitry, and Maksym Serbyn. “Quantum Scars Make Their Mark in Graphene.”
Nature. Springer Nature, 2024. https://doi.org/10.1038/d41586-024-03649-y.
ieee: D. Abanin and M. Serbyn, “Quantum scars make their mark in graphene,” Nature,
vol. 635, no. 8040. Springer Nature, pp. 825–826, 2024.
ista: Abanin D, Serbyn M. 2024. Quantum scars make their mark in graphene. Nature.
635(8040), 825–826.
mla: Abanin, Dmitry, and Maksym Serbyn. “Quantum Scars Make Their Mark in Graphene.”
Nature, vol. 635, no. 8040, Springer Nature, 2024, pp. 825–26, doi:10.1038/d41586-024-03649-y.
short: D. Abanin, M. Serbyn, Nature 635 (2024) 825–826.
das_tickbox: '0'
date_created: 2024-12-03T18:08:16Z
date_published: 2024-11-27T00:00:00Z
date_updated: 2026-10-16T12:14:31Z
day: '27'
department:
- _id: MaSe
doi: 10.1038/d41586-024-03649-y
external_id:
isi:
- '001367935000029'
pmid:
- '39604614'
fulldoi: https://doi.org/10.1038/d41586-024-03649-y
intvolume: ' 635'
isi: 1
issue: '8040'
language:
- iso: eng
month: '11'
oa_version: None
page: 825-826
pmid: 1
publication: Nature
publication_identifier:
eissn:
- 1476-4687
issn:
- 0028-0836
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
researchdata_availability: no
scopus_import: '1'
status: public
supplementarymaterial: no
title: Quantum scars make their mark in graphene
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 635
year: '2024'
...
---
DOAJ_listed: '1'
_id: '15053'
abstract:
- lang: eng
text: Atom-based quantum simulators have had many successes in tackling challenging
quantum many-body problems, owing to the precise and dynamical control that they
provide over the systems' parameters. They are, however, often optimized to address
a specific type of problem. Here, we present the design and implementation of
a 6Li-based quantum gas platform that provides wide-ranging capabilities and is
able to address a variety of quantum many-body problems. Our two-chamber architecture
relies on a robust combination of gray molasses and optical transport from a laser-cooling
chamber to a glass cell with excellent optical access. There, we first create
unitary Fermi superfluids in a three-dimensional axially symmetric harmonic trap
and characterize them using in situ thermometry, reaching temperatures below 20
nK. This allows us to enter the deep superfluid regime with samples of extreme
diluteness, where the interparticle spacing is sufficiently large for direct single-atom
imaging. Second, we generate optical lattice potentials with triangular and honeycomb
geometry in which we study diffraction of molecular Bose-Einstein condensates,
and show how going beyond the Kapitza-Dirac regime allows us to unambiguously
distinguish between the two geometries. With the ability to probe quantum many-body
physics in both discrete and continuous space, and its suitability for bulk and
single-atom imaging, our setup represents an important step towards achieving
a wide-scope quantum simulator.
acknowledgement: We thank Clara Bachorz, Darby Bates, Markus Bohlen, Valentin Crépel,
Yann Kiefer, Joanna Lis, Mihail Rabinovic, and Julian Struck for experimental assistance
in the early stages of this project, and Sebastian Will for a critical reading of
the manuscript. This work has been supported by Agence Nationale de la Recherche
(Grant No. ANR-21-CE30-0021), the European Research Council (Grant No. ERC-2016-ADG-743159),
CNRS (Tremplin@INP 2020), and Région Ile-de-France in the framework of DIM SIRTEQ
(Super2D and SISCo) and DIM QuanTiP.
article_number: '013158'
article_processing_charge: Yes
article_type: original
arxiv: 1
author:
- first_name: Shuwei
full_name: Jin, Shuwei
last_name: Jin
- first_name: Kunlun
full_name: Dai, Kunlun
last_name: Dai
- first_name: Joris
full_name: Verstraten, Joris
last_name: Verstraten
- first_name: Maxime
full_name: Dixmerias, Maxime
last_name: Dixmerias
- first_name: Ragheed
full_name: Al Hyder, Ragheed
id: d1c405be-ae15-11ed-8510-ccf53278162e
last_name: Al Hyder
- first_name: Christophe
full_name: Salomon, Christophe
last_name: Salomon
- first_name: Bruno
full_name: Peaudecerf, Bruno
last_name: Peaudecerf
- first_name: Tim
full_name: de Jongh, Tim
last_name: de Jongh
- first_name: Tarik
full_name: Yefsah, Tarik
last_name: Yefsah
citation:
ama: Jin S, Dai K, Verstraten J, et al. Multipurpose platform for analog quantum
simulation. Physical Review Research. 2024;6(1). doi:10.1103/physrevresearch.6.013158
apa: Jin, S., Dai, K., Verstraten, J., Dixmerias, M., Al Hyder, R., Salomon, C.,
… Yefsah, T. (2024). Multipurpose platform for analog quantum simulation. Physical
Review Research. American Physical Society. https://doi.org/10.1103/physrevresearch.6.013158
chicago: Jin, Shuwei, Kunlun Dai, Joris Verstraten, Maxime Dixmerias, Ragheed Al
Hyder, Christophe Salomon, Bruno Peaudecerf, Tim de Jongh, and Tarik Yefsah. “Multipurpose
Platform for Analog Quantum Simulation.” Physical Review Research. American
Physical Society, 2024. https://doi.org/10.1103/physrevresearch.6.013158.
ieee: S. Jin et al., “Multipurpose platform for analog quantum simulation,”
Physical Review Research, vol. 6, no. 1. American Physical Society, 2024.
ista: Jin S, Dai K, Verstraten J, Dixmerias M, Al Hyder R, Salomon C, Peaudecerf
B, de Jongh T, Yefsah T. 2024. Multipurpose platform for analog quantum simulation.
Physical Review Research. 6(1), 013158.
mla: Jin, Shuwei, et al. “Multipurpose Platform for Analog Quantum Simulation.”
Physical Review Research, vol. 6, no. 1, 013158, American Physical Society,
2024, doi:10.1103/physrevresearch.6.013158.
short: S. Jin, K. Dai, J. Verstraten, M. Dixmerias, R. Al Hyder, C. Salomon, B.
Peaudecerf, T. de Jongh, T. Yefsah, Physical Review Research 6 (2024).
das_tickbox: '0'
date_created: 2024-03-04T07:42:52Z
date_published: 2024-02-13T00:00:00Z
date_updated: 2026-10-16T12:17:44Z
day: '13'
ddc:
- '530'
department:
- _id: MiLe
doi: 10.1103/physrevresearch.6.013158
external_id:
arxiv:
- '2304.08433'
file:
- access_level: open_access
checksum: ba2ae3e3a011f8897d3803c9366a67e2
content_type: application/pdf
creator: dernst
date_created: 2024-03-04T07:53:08Z
date_updated: 2024-03-04T07:53:08Z
file_id: '15054'
file_name: 2024_PhysicalReviewResearch_Jin.pdf
file_size: 4025988
relation: main_file
success: 1
file_date_updated: 2024-03-04T07:53:08Z
fulldoi: https://doi.org/10.1103/physrevresearch.6.013158
has_accepted_license: '1'
intvolume: ' 6'
issue: '1'
keyword:
- General Physics and Astronomy
language:
- iso: eng
month: '02'
oa: 1
oa_version: Published Version
publication: Physical Review Research
publication_identifier:
eissn:
- 2643-1564
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
researchdata_availability: no
scopus_import: '1'
status: public
supplementarymaterial: yes
title: Multipurpose platform for analog quantum simulation
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: 6
year: '2024'
...
---
DOAJ_listed: '1'
_id: '15181'
abstract:
- lang: eng
text: We demonstrate the failure of the adiabatic Born-Oppenheimer approximation
to describe the ground state of a quantum impurity within an ultracold Fermi gas
despite substantial mass differences between the bath and impurity species. Increasing
repulsion leads to the appearance of nonadiabatic couplings between the fast bath
and slow impurity degrees of freedom, which reduce the parity symmetry of the
latter according to the pseudo Jahn-Teller effect. The presence of this mechanism
is associated to a conical intersection involving the impurity position and the
inverse of the interaction strength, which acts as a synthetic dimension. We elucidate
the presence of these effects via a detailed ground-state analysis involving the
comparison of ab initio fully correlated simulations with effective models. Our
study suggests ultracold atomic ensembles as potent emulators of complex molecular
phenomena.
acknowledgement: "This work has been funded by the Cluster of Excellence “Advanced
Imaging of Matter” of the Deutsche Forschungsgemeinschaft (DFG) - EXC 2056 - Project
ID 390715994.\r\nG.M.K. gratefully acknowledges funding from the European Union’s
Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie
Grant Agreement No. 101034413."
article_number: '013257'
article_processing_charge: Yes
article_type: original
arxiv: 1
author:
- first_name: A.
full_name: Becker, A.
last_name: Becker
- first_name: Georgios
full_name: Koutentakis, Georgios
id: d7b23d3a-9e21-11ec-b482-f76739596b95
last_name: Koutentakis
- first_name: P.
full_name: Schmelcher, P.
last_name: Schmelcher
citation:
ama: Becker A, Koutentakis G, Schmelcher P. Synthetic dimension-induced pseudo Jahn-Teller
effect in one-dimensional confined fermions. Physical Review Research.
2024;6(1). doi:10.1103/physrevresearch.6.013257
apa: Becker, A., Koutentakis, G., & Schmelcher, P. (2024). Synthetic dimension-induced
pseudo Jahn-Teller effect in one-dimensional confined fermions. Physical Review
Research. American Physical Society. https://doi.org/10.1103/physrevresearch.6.013257
chicago: Becker, A., Georgios Koutentakis, and P. Schmelcher. “Synthetic Dimension-Induced
Pseudo Jahn-Teller Effect in One-Dimensional Confined Fermions.” Physical Review
Research. American Physical Society, 2024. https://doi.org/10.1103/physrevresearch.6.013257.
ieee: A. Becker, G. Koutentakis, and P. Schmelcher, “Synthetic dimension-induced
pseudo Jahn-Teller effect in one-dimensional confined fermions,” Physical Review
Research, vol. 6, no. 1. American Physical Society, 2024.
ista: Becker A, Koutentakis G, Schmelcher P. 2024. Synthetic dimension-induced pseudo
Jahn-Teller effect in one-dimensional confined fermions. Physical Review Research.
6(1), 013257.
mla: Becker, A., et al. “Synthetic Dimension-Induced Pseudo Jahn-Teller Effect in
One-Dimensional Confined Fermions.” Physical Review Research, vol. 6, no.
1, 013257, American Physical Society, 2024, doi:10.1103/physrevresearch.6.013257.
short: A. Becker, G. Koutentakis, P. Schmelcher, Physical Review Research 6 (2024).
das_tickbox: '0'
date_created: 2024-03-25T08:57:07Z
date_published: 2024-03-01T00:00:00Z
date_updated: 2026-10-16T12:18:24Z
day: '01'
ddc:
- '530'
department:
- _id: MiLe
doi: 10.1103/physrevresearch.6.013257
ec_funded: 1
external_id:
arxiv:
- '2310.17995'
file:
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checksum: 4e0e58d1f58386fb016284c84db2a300
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creator: dernst
date_created: 2024-03-25T09:24:55Z
date_updated: 2024-03-25T09:24:55Z
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file_name: 2024_PhysicalReviewResearch_Becker.pdf
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file_date_updated: 2024-03-25T09:24:55Z
fulldoi: https://doi.org/10.1103/physrevresearch.6.013257
has_accepted_license: '1'
intvolume: ' 6'
issue: '1'
language:
- iso: eng
month: '03'
oa: 1
oa_version: Published Version
project:
- _id: fc2ed2f7-9c52-11eb-aca3-c01059dda49c
call_identifier: H2020
grant_number: '101034413'
name: 'IST-BRIDGE: International postdoctoral program'
publication: Physical Review Research
publication_identifier:
eissn:
- 2643-1564
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
researchdata_availability: no
scopus_import: '1'
status: public
supplementarymaterial: yes
title: Synthetic dimension-induced pseudo Jahn-Teller effect in one-dimensional confined
fermions
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: 6
year: '2024'
...