---
OA_place: repository
_id: '21960'
abstract:
- lang: eng
text: "Solitons - localized wave packets that travel without spreading - play a
central role in understanding transport and properties of nonlinear systems. In
quantum many-body systems, however, such robust excitations are typically destroyed
by thermalization. Here, we theoretically demonstrate the existence of solitonic
excitations in high-energy states of Rydberg atom chains in the regime of strong
nearest-neighbor Rydberg blockade. \r\nThese localized wave packets propagate
directionally atop a special class of reviving initial states related to quantum
many-body scars and are capable of carrying energy. Exhibiting long coherence
times, these states constitute a form of non-ergodic quantum dynamics and can
be efficiently implemented on Rydberg atom simulators. In this work, in addition
to a phenomenological description of solitons, we identify their counterpart in
a classical nonlinear dynamical system, demonstrate their potential use in quantum
information transfer, and conjecture their relevance for anomalous energy transport
reported in numerical studies of Rydberg atom arrays."
article_processing_charge: No
author:
- first_name: Aron
full_name: Kerschbaumer, Aron
id: ade85a9c-3200-11ee-973b-91c1eb240410
last_name: Kerschbaumer
orcid: 0009-0002-2370-8661
citation:
ama: 'Kerschbaumer A. Research Data: “Quasi-solitons in Rydberg atom chains.” 2026.
doi:10.15479/AT-ISTA-21960'
apa: 'Kerschbaumer, A. (2026). Research Data: “Quasi-solitons in Rydberg atom chains.”
Institute of Science and Technology Austria. https://doi.org/10.15479/AT-ISTA-21960'
chicago: 'Kerschbaumer, Aron. “Research Data: ‘Quasi-Solitons in Rydberg Atom Chains.’”
Institute of Science and Technology Austria, 2026. https://doi.org/10.15479/AT-ISTA-21960.'
ieee: 'A. Kerschbaumer, “Research Data: ‘Quasi-solitons in Rydberg atom chains.’”
Institute of Science and Technology Austria, 2026.'
ista: 'Kerschbaumer A. 2026. Research Data: ‘Quasi-solitons in Rydberg atom chains’,
Institute of Science and Technology Austria, 10.15479/AT-ISTA-21960.'
mla: 'Kerschbaumer, Aron. Research Data: “Quasi-Solitons in Rydberg Atom Chains.”
Institute of Science and Technology Austria, 2026, doi:10.15479/AT-ISTA-21960.'
short: A. Kerschbaumer, (2026).
contributor:
- contributor_type: contact_person
first_name: Aron
id: ade85a9c-3200-11ee-973b-91c1eb240410
last_name: Kerschbaumer
orcid: 0009-0002-2370-8661
- contributor_type: supervisor
first_name: Maksym
id: 47809E7E-F248-11E8-B48F-1D18A9856A87
last_name: Serbyn
orcid: 0000-0002-2399-5827
- 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: Marko
last_name: Ljubotina
corr_author: '1'
date_created: 2026-06-09T07:17:50Z
date_published: 2026-06-16T00:00:00Z
date_updated: 2026-06-16T08:00:38Z
day: '16'
department:
- _id: GradSch
- _id: MaSe
doi: 10.15479/AT-ISTA-21960
ec_funded: 1
file:
- access_level: open_access
checksum: 133269a105e996c6c44fdd56128259c7
content_type: text/plain
creator: akerschb
date_created: 2026-06-15T22:01:57Z
date_updated: 2026-06-15T22:01:57Z
file_id: '22010'
file_name: README.txt
file_size: 1940
relation: main_file
success: 1
- access_level: open_access
checksum: 759f9649c3919f4c4ad37a1d104ea32a
content_type: application/zip
creator: akerschb
date_created: 2026-06-15T22:02:07Z
date_updated: 2026-06-15T22:02:07Z
file_id: '22011'
file_name: Soliton_Data.zip
file_size: 13259747
relation: main_file
success: 1
file_date_updated: 2026-06-15T22:02:07Z
has_accepted_license: '1'
month: '06'
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
status: public
title: 'Research Data: "Quasi-solitons in Rydberg atom chains"'
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: '2026'
...
---
OA_place: repository
OA_type: green
_id: '21272'
abstract:
- lang: eng
text: Finding the ground state of Ising spin glasses is notoriously difficult due
to disorder and frustration. Often, this challenge is framed as a combinatorial
optimization problem, for which a common strategy employs simulated annealing,
a Monte Carlo (MC)-based algorithm that updates spins one at a time. Yet, these
localized updates can cause the system to become trapped in local minima. Cluster
algorithms (CAs) were developed to address this limitation and have demonstrated
considerable success in studying ferromagnetic systems; however, they tend to
encounter percolation issues when applied to generic spin glasses. In this work,
we introduce a novel CA designed to tackle these challenges by leveraging precomputed
two-point correlations, aiming solve combinatorial optimization problems in the
form of Max-Cut more efficiently. In our approach, clusters are formed probabilistically
based on these correlations. Various classical and quantum algorithms can be employed
to generate correlations that embody information about the energy landscape of
the problem. By utilizing this information, the algorithm aims to identify groups
of spins whose simultaneous flipping induces large transitions in configuration
space with high acceptance probability - even at low energy levels - thereby escaping
local minima more effectively. Notably, clusters generated using correlations
from the Quantum Approximate Optimization Algorithm exhibit high acceptance rates
at low temperatures. These acceptance rates often increase with circuit depth,
accelerating the algorithm and enabling more efficient exploration of the solution
space.
acknowledgement: "P.J.E was partially funded by the German BMWK project QCHALLenge
(Grant No. 01MQ22008B).\r\n"
article_processing_charge: No
arxiv: 1
author:
- first_name: Peter J.
full_name: Eder, Peter J.
last_name: Eder
- first_name: Aron
full_name: Kerschbaumer, Aron
id: ade85a9c-3200-11ee-973b-91c1eb240410
last_name: Kerschbaumer
orcid: 0009-0002-2370-8661
- first_name: Jernej Rudi
full_name: Finžgar, Jernej Rudi
last_name: Finžgar
- 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: Martin J. A.
full_name: Schuetz, Martin J. A.
last_name: Schuetz
- first_name: Helmut G.
full_name: Katzgraber, Helmut G.
last_name: Katzgraber
- first_name: Sarah
full_name: Braun, Sarah
last_name: Braun
- first_name: Christian B.
full_name: Mendl, Christian B.
last_name: Mendl
citation:
ama: 'Eder PJ, Kerschbaumer A, Finžgar JR, et al. Quantum-guided cluster algorithms
for combinatorial optimization. In: 2025 IEEE International Conference on Quantum
Computing and Engineering. IEEE; 2025. doi:10.1109/qce65121.2025.00033'
apa: 'Eder, P. J., Kerschbaumer, A., Finžgar, J. R., Medina Ramos, R. A., Schuetz,
M. J. A., Katzgraber, H. G., … Mendl, C. B. (2025). Quantum-guided cluster algorithms
for combinatorial optimization. In 2025 IEEE International Conference on Quantum
Computing and Engineering. Albuquerque, NM, United States: IEEE. https://doi.org/10.1109/qce65121.2025.00033'
chicago: Eder, Peter J., Aron Kerschbaumer, Jernej Rudi Finžgar, Raimel A Medina
Ramos, Martin J. A. Schuetz, Helmut G. Katzgraber, Sarah Braun, and Christian
B. Mendl. “Quantum-Guided Cluster Algorithms for Combinatorial Optimization.”
In 2025 IEEE International Conference on Quantum Computing and Engineering.
IEEE, 2025. https://doi.org/10.1109/qce65121.2025.00033.
ieee: P. J. Eder et al., “Quantum-guided cluster algorithms for combinatorial
optimization,” in 2025 IEEE International Conference on Quantum Computing and
Engineering, Albuquerque, NM, United States, 2025.
ista: 'Eder PJ, Kerschbaumer A, Finžgar JR, Medina Ramos RA, Schuetz MJA, Katzgraber
HG, Braun S, Mendl CB. 2025. Quantum-guided cluster algorithms for combinatorial
optimization. 2025 IEEE International Conference on Quantum Computing and Engineering.
QCE: International Conference on Quantum Computing and Engineering.'
mla: Eder, Peter J., et al. “Quantum-Guided Cluster Algorithms for Combinatorial
Optimization.” 2025 IEEE International Conference on Quantum Computing and
Engineering, IEEE, 2025, doi:10.1109/qce65121.2025.00033.
short: P.J. Eder, A. Kerschbaumer, J.R. Finžgar, R.A. Medina Ramos, M.J.A. Schuetz,
H.G. Katzgraber, S. Braun, C.B. Mendl, in:, 2025 IEEE International Conference
on Quantum Computing and Engineering, IEEE, 2025.
conference:
end_date: 2025-09-05
location: Albuquerque, NM, United States
name: 'QCE: International Conference on Quantum Computing and Engineering'
start_date: 2025-08-30
corr_author: '1'
date_created: 2026-02-17T08:00:17Z
date_published: 2025-09-01T00:00:00Z
date_updated: 2026-02-18T08:45:56Z
day: '01'
department:
- _id: MaSe
doi: 10.1109/qce65121.2025.00033
external_id:
arxiv:
- '2508.10656'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.48550/arXiv.2508.10656
month: '09'
oa: 1
oa_version: Preprint
publication: 2025 IEEE International Conference on Quantum Computing and Engineering
publication_identifier:
eisbn:
- '9798331557362'
publication_status: published
publisher: IEEE
quality_controlled: '1'
status: public
title: Quantum-guided cluster algorithms for combinatorial optimization
type: conference
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
year: '2025'
...
---
OA_place: publisher
OA_type: hybrid
_id: '19664'
abstract:
- lang: eng
text: Persistent revivals recently observed in Rydberg atom simulators have challenged
our understanding of thermalization and attracted much interest to the concept
of quantum many-body scars (QMBSs). QMBSs are non-thermal highly excited eigenstates
that coexist with typical eigenstates in the spectrum of many-body Hamiltonians,
and have since been reported in multiple theoretical models, including the so-called
PXP model, approximately realized by Rydberg simulators. At the same time, questions
of how common QMBSs are and in what models they are physically realized remain
open. In this Letter, we demonstrate that QMBSs exist in a broader family of models
that includes and generalizes PXP to longer-range constraints and states with
different periodicity. We show that in each model, multiple QMBS families can
be found. Each of them relies on a different approximate algebra, leading to oscillatory
dynamics in all cases. However, in contrast to the PXP model, their observation
requires launching dynamics from weakly entangled initial states rather than from
a product state. QMBSs reported here may be experimentally probed using Rydberg
atom simulator in the regime of longer-range Rydberg blockades.
acknowledgement: The authors are grateful to Zlatko Papić, Dolev Bluvstein, Nishad
Maskara, Marcello Dalmonte, Thomas Iadecola, and Johannes Feldmeier for insightful
discussions. A. K., 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). J.-Y. D. acknowledges funding from the European Union’s
Horizon 2020 research and innovation program under the Marie Skłodowska-Curie Grant
Agreement No. 101034413.
article_number: '160401'
article_processing_charge: Yes (via OA deal)
article_type: original
arxiv: 1
author:
- first_name: Aron
full_name: Kerschbaumer, Aron
id: ade85a9c-3200-11ee-973b-91c1eb240410
last_name: Kerschbaumer
orcid: 0009-0002-2370-8661
- first_name: Marko
full_name: Ljubotina, Marko
id: F75EE9BE-5C90-11EA-905D-16643DDC885E
last_name: Ljubotina
orcid: 0000-0003-0038-7068
- first_name: Maksym
full_name: Serbyn, Maksym
id: 47809E7E-F248-11E8-B48F-1D18A9856A87
last_name: Serbyn
orcid: 0000-0002-2399-5827
- 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: Kerschbaumer A, Ljubotina M, Serbyn M, Desaules J-YM. Quantum many-body scars
beyond the PXP model in Rydberg simulators. Physical Review Letters. 2025;134(16).
doi:10.1103/PhysRevLett.134.160401
apa: Kerschbaumer, A., Ljubotina, M., Serbyn, M., & Desaules, J.-Y. M. (2025).
Quantum many-body scars beyond the PXP model in Rydberg simulators. Physical
Review Letters. American Physical Society. https://doi.org/10.1103/PhysRevLett.134.160401
chicago: Kerschbaumer, Aron, Marko Ljubotina, Maksym Serbyn, and Jean-Yves Marc
Desaules. “Quantum Many-Body Scars beyond the PXP Model in Rydberg Simulators.”
Physical Review Letters. American Physical Society, 2025. https://doi.org/10.1103/PhysRevLett.134.160401.
ieee: A. Kerschbaumer, M. Ljubotina, M. Serbyn, and J.-Y. M. Desaules, “Quantum
many-body scars beyond the PXP model in Rydberg simulators,” Physical Review
Letters, vol. 134, no. 16. American Physical Society, 2025.
ista: Kerschbaumer A, Ljubotina M, Serbyn M, Desaules J-YM. 2025. Quantum many-body
scars beyond the PXP model in Rydberg simulators. Physical Review Letters. 134(16),
160401.
mla: Kerschbaumer, Aron, et al. “Quantum Many-Body Scars beyond the PXP Model in
Rydberg Simulators.” Physical Review Letters, vol. 134, no. 16, 160401,
American Physical Society, 2025, doi:10.1103/PhysRevLett.134.160401.
short: A. Kerschbaumer, M. Ljubotina, M. Serbyn, J.-Y.M. Desaules, Physical Review
Letters 134 (2025).
date_created: 2025-05-11T22:02:38Z
date_published: 2025-04-22T00:00:00Z
date_updated: 2026-06-10T08:40:51Z
day: '22'
ddc:
- '530'
department:
- _id: MaSe
doi: 10.1103/PhysRevLett.134.160401
ec_funded: 1
external_id:
arxiv:
- '2410.18913'
isi:
- '001480669300011'
pmid:
- '40344113'
file:
- access_level: open_access
checksum: b7f581291e20f152d0efc64727314ca2
content_type: application/pdf
creator: dernst
date_created: 2025-05-12T07:33:38Z
date_updated: 2025-05-12T07:33:38Z
file_id: '19677'
file_name: 2025_PhysReviewLetters_Kerschbaumer.pdf
file_size: 1028993
relation: main_file
success: 1
file_date_updated: 2025-05-12T07:33:38Z
has_accepted_license: '1'
intvolume: ' 134'
isi: 1
issue: '16'
language:
- iso: eng
month: '04'
oa: 1
oa_version: Published Version
pmid: 1
project:
- _id: 23841C26-32DE-11EA-91FC-C7463DDC885E
call_identifier: H2020
grant_number: '850899'
name: 'Non-Ergodic Quantum Matter: Universality, Dynamics and Control'
- _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:
link:
- description: News on ISTA website
relation: press_release
url: https://ista.ac.at/en/news/a-sky-full-of-quantum-scars/
record:
- id: '19623'
relation: research_data
status: public
scopus_import: '1'
status: public
title: Quantum many-body scars beyond the PXP model in Rydberg simulators
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: ba8df636-2132-11f1-aed0-ed93e2281fdd
volume: 134
year: '2025'
...
---
DOAJ_listed: '1'
OA_place: publisher
OA_type: gold
_id: '15407'
abstract:
- lang: eng
text: We propose and implement a family of quantum-informed recursive optimization
(QIRO) algorithms for combinatorial optimization problems. Our approach leverages
quantum resources to obtain information that is used in problem-specific classical
reduction steps that recursively simplify the problem. These reduction steps address
the limitations of the quantum component (e.g., locality) and ensure solution
feasibility in constrained optimization problems. Additionally, we use backtracking
techniques to further improve the performance of the algorithm without increasing
the requirements on the quantum hardware. We showcase the capabilities of our
approach by informing QIRO with correlations from classical simulations of shallow
circuits of the quantum approximate optimization algorithm, solving instances
of maximum independent set and maximum satisfiability problems with hundreds of
variables. We also demonstrate how QIRO can be deployed on a neutral atom quantum
processor to find large independent sets of graphs. In summary, our scheme achieves
results comparable to classical heuristics even with relatively weak quantum resources.
Furthermore, enhancing the quality of these quantum resources improves the performance
of the algorithms. Notably, the modular nature of QIRO offers various avenues
for modifications, positioning our work as a template for a broader class of hybrid
quantum-classical algorithms for combinatorial optimization.
acknowledgement: J.R.F. and A.K. thank Libor Caha and Alexander Kliesch for insightful
discussions. The authors thank Lilly Palackal, Maximilian Passek, Carlos Riofrío,
and Gili Rosenberg for thorough reviews of the manuscript, and the Amazon Braket,
BMW, and QuEra teams for their support. C.M. thanks the Munich Quantum Valley initiative,
which is supported by the Bavarian State Government with funds from the Hightech
Agenda Bayern Plus. H.G.K. would like to thank Am Platzl 1A for providing the necessary
environment for creative thinking. An open-source implementation of QIRO is available
online [60].
article_number: '020327'
article_processing_charge: Yes
article_type: original
arxiv: 1
author:
- first_name: Jernej Rudi
full_name: Finžgar, Jernej Rudi
last_name: Finžgar
- first_name: Aron
full_name: Kerschbaumer, Aron
id: ade85a9c-3200-11ee-973b-91c1eb240410
last_name: Kerschbaumer
- first_name: Martin J.A.
full_name: Schuetz, Martin J.A.
last_name: Schuetz
- first_name: Christian B.
full_name: Mendl, Christian B.
last_name: Mendl
- first_name: Helmut G.
full_name: Katzgraber, Helmut G.
last_name: Katzgraber
citation:
ama: Finžgar JR, Kerschbaumer A, Schuetz MJA, Mendl CB, Katzgraber HG. Quantum-informed
recursive optimization algorithms. PRX Quantum. 2024;5(2). doi:10.1103/PRXQuantum.5.020327
apa: Finžgar, J. R., Kerschbaumer, A., Schuetz, M. J. A., Mendl, C. B., & Katzgraber,
H. G. (2024). Quantum-informed recursive optimization algorithms. PRX Quantum.
American Physical Society. https://doi.org/10.1103/PRXQuantum.5.020327
chicago: Finžgar, Jernej Rudi, Aron Kerschbaumer, Martin J.A. Schuetz, Christian
B. Mendl, and Helmut G. Katzgraber. “Quantum-Informed Recursive Optimization Algorithms.”
PRX Quantum. American Physical Society, 2024. https://doi.org/10.1103/PRXQuantum.5.020327.
ieee: J. R. Finžgar, A. Kerschbaumer, M. J. A. Schuetz, C. B. Mendl, and H. G. Katzgraber,
“Quantum-informed recursive optimization algorithms,” PRX Quantum, vol.
5, no. 2. American Physical Society, 2024.
ista: Finžgar JR, Kerschbaumer A, Schuetz MJA, Mendl CB, Katzgraber HG. 2024. Quantum-informed
recursive optimization algorithms. PRX Quantum. 5(2), 020327.
mla: Finžgar, Jernej Rudi, et al. “Quantum-Informed Recursive Optimization Algorithms.”
PRX Quantum, vol. 5, no. 2, 020327, American Physical Society, 2024, doi:10.1103/PRXQuantum.5.020327.
short: J.R. Finžgar, A. Kerschbaumer, M.J.A. Schuetz, C.B. Mendl, H.G. Katzgraber,
PRX Quantum 5 (2024).
corr_author: '1'
date_created: 2024-05-19T22:01:13Z
date_published: 2024-05-01T00:00:00Z
date_updated: 2025-05-14T09:29:40Z
day: '01'
ddc:
- '530'
department:
- _id: GradSch
doi: 10.1103/PRXQuantum.5.020327
external_id:
arxiv:
- '2308.13607'
file:
- access_level: open_access
checksum: 76bdf0b4dc06d59d073a57bd6957a96c
content_type: application/pdf
creator: dernst
date_created: 2024-05-21T09:35:14Z
date_updated: 2024-05-21T09:35:14Z
file_id: '15409'
file_name: 2024_PRXQuantum_Finzgar.pdf
file_size: 2016085
relation: main_file
success: 1
file_date_updated: 2024-05-21T09:35:14Z
has_accepted_license: '1'
intvolume: ' 5'
issue: '2'
language:
- iso: eng
month: '05'
oa: 1
oa_version: Published Version
publication: PRX Quantum
publication_identifier:
eissn:
- 2691-3399
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Quantum-informed recursive optimization 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: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 5
year: '2024'
...