---
_id: '18187'
abstract:
- lang: eng
text: Quasicrystals are ordered but not periodic, which makes them fascinating objects
at the interface between order and disorder. Experiments with ultracold atoms
zoom in on this interface by driving a quasicrystal and exploring its fractal
properties.
article_processing_charge: No
article_type: letter_note
author:
- first_name: Julian
full_name: Leonard, Julian
id: b75b3f45-7995-11ef-9bfd-9a9cd02c3577
last_name: Leonard
orcid: 0000-0003-3696-6870
citation:
ama: Leonard J. A kicked quasicrystal. Nature Physics. 2024;20(3):351-352.
doi:10.1038/s41567-023-02357-0
apa: Leonard, J. (2024). A kicked quasicrystal. Nature Physics. Springer
Nature. https://doi.org/10.1038/s41567-023-02357-0
chicago: Leonard, Julian. “A Kicked Quasicrystal.” Nature Physics. Springer
Nature, 2024. https://doi.org/10.1038/s41567-023-02357-0.
ieee: J. Leonard, “A kicked quasicrystal,” Nature Physics, vol. 20, no. 3.
Springer Nature, pp. 351–352, 2024.
ista: Leonard J. 2024. A kicked quasicrystal. Nature Physics. 20(3), 351–352.
mla: Leonard, Julian. “A Kicked Quasicrystal.” Nature Physics, vol. 20, no.
3, Springer Nature, 2024, pp. 351–52, doi:10.1038/s41567-023-02357-0.
short: J. Leonard, Nature Physics 20 (2024) 351–352.
date_created: 2024-10-07T11:45:17Z
date_published: 2024-01-19T00:00:00Z
date_updated: 2024-10-14T07:54:20Z
day: '19'
doi: 10.1038/s41567-023-02357-0
extern: '1'
intvolume: ' 20'
issue: '3'
language:
- iso: eng
month: '01'
oa_version: None
page: 351-352
publication: Nature Physics
publication_identifier:
eissn:
- 1745-2481
issn:
- 1745-2473
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
scopus_import: '1'
status: public
title: A kicked quasicrystal
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 20
year: '2024'
...
---
_id: '18188'
abstract:
- lang: eng
text: New generations of ultracold-atom experiments are continually raising the
demand for efficient solutions to optimal control problems. Here, we apply Bayesian
optimization to improve a state-preparation protocol recently implemented in an
ultracold-atom system to realize a two-particle fractional quantum Hall state.
Compared to manual ramp design, we demonstrate the superior performance of our
optimization approach in a numerical simulation – resulting in a protocol that
is 10x faster at the same fidelity, even when taking into account experimentally
realistic levels of disorder in the system. We extensively analyze and discuss
questions of robustness and the relationship between numerical simulation and
experimental realization, and how to make the best use of the surrogate model
trained during optimization. We find that numerical simulation can be expected
to substantially reduce the number of experiments that need to be performed with
even the most basic transfer learning techniques. The proposed protocol and workflow
will pave the way toward the realization of more complex many-body quantum states
in experiments.
article_number: '1388'
article_processing_charge: Yes
article_type: original
arxiv: 1
author:
- first_name: Tizian
full_name: Blatz, Tizian
last_name: Blatz
- first_name: Joyce
full_name: Kwan, Joyce
last_name: Kwan
- first_name: Julian
full_name: Leonard, Julian
id: b75b3f45-7995-11ef-9bfd-9a9cd02c3577
last_name: Leonard
- first_name: Annabelle
full_name: Bohrdt, Annabelle
last_name: Bohrdt
citation:
ama: Blatz T, Kwan J, Leonard J, Bohrdt A. Bayesian optimization for robust state
preparation in quantum many-body systems. Quantum. 2024;8. doi:10.22331/q-2024-06-27-1388
apa: Blatz, T., Kwan, J., Leonard, J., & Bohrdt, A. (2024). Bayesian optimization
for robust state preparation in quantum many-body systems. Quantum. Verein
zur Förderung des Open Access Publizierens in den Quantenwissenschaften. https://doi.org/10.22331/q-2024-06-27-1388
chicago: Blatz, Tizian, Joyce Kwan, Julian Leonard, and Annabelle Bohrdt. “Bayesian
Optimization for Robust State Preparation in Quantum Many-Body Systems.” Quantum.
Verein zur Förderung des Open Access Publizierens in den Quantenwissenschaften,
2024. https://doi.org/10.22331/q-2024-06-27-1388.
ieee: T. Blatz, J. Kwan, J. Leonard, and A. Bohrdt, “Bayesian optimization for robust
state preparation in quantum many-body systems,” Quantum, vol. 8. Verein
zur Förderung des Open Access Publizierens in den Quantenwissenschaften, 2024.
ista: Blatz T, Kwan J, Leonard J, Bohrdt A. 2024. Bayesian optimization for robust
state preparation in quantum many-body systems. Quantum. 8, 1388.
mla: Blatz, Tizian, et al. “Bayesian Optimization for Robust State Preparation in
Quantum Many-Body Systems.” Quantum, vol. 8, 1388, Verein zur Förderung
des Open Access Publizierens in den Quantenwissenschaften, 2024, doi:10.22331/q-2024-06-27-1388.
short: T. Blatz, J. Kwan, J. Leonard, A. Bohrdt, Quantum 8 (2024).
date_created: 2024-10-07T11:45:56Z
date_published: 2024-06-27T00:00:00Z
date_updated: 2024-10-08T11:15:55Z
day: '27'
doi: 10.22331/q-2024-06-27-1388
extern: '1'
external_id:
arxiv:
- '2312.09253'
intvolume: ' 8'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.22331/q-2024-06-27-1388
month: '06'
oa: 1
oa_version: Published Version
publication: Quantum
publication_identifier:
issn:
- 2521-327X
publication_status: published
publisher: Verein zur Förderung des Open Access Publizierens in den Quantenwissenschaften
quality_controlled: '1'
scopus_import: '1'
status: public
title: Bayesian optimization for robust state preparation in quantum many-body systems
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 8
year: '2024'
...
---
_id: '18202'
abstract:
- lang: eng
text: "We report on adiabatic state preparation in the one-dimensional quantum Ising\r\nmodel
using ultracold bosons in a tilted optical lattice. We prepare many-body\r\nground
states of controllable system sizes and observe enhanced fluctuations\r\naround
the transition between paramagnetic and antiferromagnetic states,\r\nmarking the
precursor of quantum critical behavior. Furthermore, we find\r\nevidence for superpositions
of domain walls and study their effect on the\r\nmany-body ground state by measuring
the populations of each spin configuration\r\nacross the transition. These results
shed new light on the effect of boundary\r\nconditions in finite-size quantum
systems."
article_number: '2404.07481'
article_processing_charge: No
arxiv: 1
author:
- first_name: Sooshin
full_name: Kim, Sooshin
last_name: Kim
- first_name: Alexander
full_name: Lukin, Alexander
last_name: Lukin
- first_name: Matthew
full_name: Rispoli, Matthew
last_name: Rispoli
- first_name: M. Eric
full_name: Tai, M. Eric
last_name: Tai
- first_name: Adam M.
full_name: Kaufman, Adam M.
last_name: Kaufman
- first_name: Perrin
full_name: Segura, Perrin
last_name: Segura
- first_name: Yanfei
full_name: Li, Yanfei
last_name: Li
- first_name: Joyce
full_name: Kwan, Joyce
last_name: Kwan
- first_name: Julian
full_name: Leonard, Julian
id: b75b3f45-7995-11ef-9bfd-9a9cd02c3577
last_name: Leonard
- first_name: Brice Bakkali-Hassani
full_name: Brice Bakkali-Hassani, Brice Bakkali-Hassani
last_name: Brice Bakkali-Hassani
- first_name: Markus
full_name: Greiner, Markus
last_name: Greiner
citation:
ama: Kim S, Lukin A, Rispoli M, et al. Adiabatic state preparation in a quantum
Ising spin chain. arXiv. doi:10.48550/arXiv.2404.07481
apa: Kim, S., Lukin, A., Rispoli, M., Tai, M. E., Kaufman, A. M., Segura, P., …
Greiner, M. (n.d.). Adiabatic state preparation in a quantum Ising spin chain.
arXiv. https://doi.org/10.48550/arXiv.2404.07481
chicago: Kim, Sooshin, Alexander Lukin, Matthew Rispoli, M. Eric Tai, Adam M. Kaufman,
Perrin Segura, Yanfei Li, et al. “Adiabatic State Preparation in a Quantum Ising
Spin Chain.” ArXiv, n.d. https://doi.org/10.48550/arXiv.2404.07481.
ieee: S. Kim et al., “Adiabatic state preparation in a quantum Ising spin
chain,” arXiv. .
ista: Kim S, Lukin A, Rispoli M, Tai ME, Kaufman AM, Segura P, Li Y, Kwan J, Leonard
J, Brice Bakkali-Hassani BB-H, Greiner M. Adiabatic state preparation in a quantum
Ising spin chain. arXiv, 2404.07481.
mla: Kim, Sooshin, et al. “Adiabatic State Preparation in a Quantum Ising Spin Chain.”
ArXiv, 2404.07481, doi:10.48550/arXiv.2404.07481.
short: S. Kim, A. Lukin, M. Rispoli, M.E. Tai, A.M. Kaufman, P. Segura, Y. Li, J.
Kwan, J. Leonard, B.B.-H. Brice Bakkali-Hassani, M. Greiner, ArXiv (n.d.).
date_created: 2024-10-08T11:25:52Z
date_published: 2024-04-11T00:00:00Z
date_updated: 2024-10-08T11:28:26Z
day: '11'
doi: 10.48550/arXiv.2404.07481
extern: '1'
external_id:
arxiv:
- '2404.07481'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.48550/arXiv.2404.07481
month: '04'
oa: 1
oa_version: Preprint
publication: arXiv
publication_status: submitted
status: public
title: Adiabatic state preparation in a quantum Ising spin chain
type: preprint
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
year: '2024'
...
---
_id: '18189'
abstract:
- lang: eng
text: 'Strongly interacting topological matter1 exhibits fundamentally new phenomena
with potential applications in quantum information technology2,3. Emblematic instances
are fractional quantum Hall (FQH) states4, in which the interplay of a magnetic
field and strong interactions gives rise to fractionally charged quasi-particles,
long-ranged entanglement and anyonic exchange statistics. Progress in engineering
synthetic magnetic fields5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21 has raised
the hope to create these exotic states in controlled quantum systems. However,
except for a recent Laughlin state of light22, preparing FQH states in engineered
systems remains elusive. Here we realize a FQH state with ultracold atoms in an
optical lattice. The state is a lattice version of a bosonic ν = 1/2 Laughlin
state4,23 with two particles on 16 sites. This minimal system already captures
many hallmark features of Laughlin-type FQH states24,25,26,27,28: we observe a
suppression of two-body interactions, we find a distinctive vortex structure in
the density correlations and we measure a fractional Hall conductivity of σH/σ0 = 0.6(2)
by means of the bulk response to a magnetic perturbation. Furthermore, by tuning
the magnetic field, we map out the transition point between the normal and the
FQH regime through a spectroscopic investigation of the many-body gap. Our work
provides a starting point for exploring highly entangled topological matter with
ultracold atoms29,30,31,32,33.'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Julian
full_name: Leonard, Julian
id: b75b3f45-7995-11ef-9bfd-9a9cd02c3577
last_name: Leonard
- first_name: Sooshin
full_name: Kim, Sooshin
last_name: Kim
- first_name: Joyce
full_name: Kwan, Joyce
last_name: Kwan
- first_name: Perrin
full_name: Segura, Perrin
last_name: Segura
- first_name: Fabian
full_name: Grusdt, Fabian
last_name: Grusdt
- first_name: Cécile
full_name: Repellin, Cécile
last_name: Repellin
- first_name: Nathan
full_name: Goldman, Nathan
last_name: Goldman
- first_name: Markus
full_name: Greiner, Markus
last_name: Greiner
citation:
ama: Leonard J, Kim S, Kwan J, et al. Realization of a fractional quantum Hall state
with ultracold atoms. Nature. 2023;619(7970):495-499. doi:10.1038/s41586-023-06122-4
apa: Leonard, J., Kim, S., Kwan, J., Segura, P., Grusdt, F., Repellin, C., … Greiner,
M. (2023). Realization of a fractional quantum Hall state with ultracold atoms.
Nature. Springer Nature. https://doi.org/10.1038/s41586-023-06122-4
chicago: Leonard, Julian, Sooshin Kim, Joyce Kwan, Perrin Segura, Fabian Grusdt,
Cécile Repellin, Nathan Goldman, and Markus Greiner. “Realization of a Fractional
Quantum Hall State with Ultracold Atoms.” Nature. Springer Nature, 2023.
https://doi.org/10.1038/s41586-023-06122-4.
ieee: J. Leonard et al., “Realization of a fractional quantum Hall state
with ultracold atoms,” Nature, vol. 619, no. 7970. Springer Nature, pp.
495–499, 2023.
ista: Leonard J, Kim S, Kwan J, Segura P, Grusdt F, Repellin C, Goldman N, Greiner
M. 2023. Realization of a fractional quantum Hall state with ultracold atoms.
Nature. 619(7970), 495–499.
mla: Leonard, Julian, et al. “Realization of a Fractional Quantum Hall State with
Ultracold Atoms.” Nature, vol. 619, no. 7970, Springer Nature, 2023, pp.
495–99, doi:10.1038/s41586-023-06122-4.
short: J. Leonard, S. Kim, J. Kwan, P. Segura, F. Grusdt, C. Repellin, N. Goldman,
M. Greiner, Nature 619 (2023) 495–499.
date_created: 2024-10-07T11:46:13Z
date_published: 2023-06-21T00:00:00Z
date_updated: 2024-10-08T11:09:24Z
day: '21'
doi: 10.1038/s41586-023-06122-4
extern: '1'
external_id:
arxiv:
- '2210.10919'
pmid:
- '37344594 '
intvolume: ' 619'
issue: '7970'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.48550/arXiv.2210.10919
month: '06'
oa: 1
oa_version: Preprint
page: 495-499
pmid: 1
publication: Nature
publication_identifier:
eissn:
- 1476-4687
issn:
- 0028-0836
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
scopus_import: '1'
status: public
title: Realization of a fractional quantum Hall state with ultracold atoms
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 619
year: '2023'
...
---
_id: '18190'
abstract:
- lang: eng
text: Strongly correlated systems can exhibit unexpected phenomena when brought
in a state far from equilibrium. An example is many-body localization, which prevents
generic interacting systems from reaching thermal equilibrium even at long times1,2.
The stability of the many-body localized phase has been predicted to be hindered
by the presence of small thermal inclusions that act as a bath, leading to the
delocalization of the entire system through an avalanche propagation mechanism3,4,5,6,7,8.
Here we study the dynamics of a thermal inclusion of variable size when it is
coupled to a many-body localized system. We find evidence for accelerated transport
of thermal inclusion into the localized region. We monitor how the avalanche spreads
through the localized system and thermalizes it site by site by measuring the
site-resolved entropy over time. Furthermore, we isolate the strongly correlated
bath-induced dynamics with multipoint correlations between the bath and the system.
Our results have implications on the robustness of many-body localized systems
and their critical behaviour.
article_processing_charge: No
article_type: letter_note
arxiv: 1
author:
- first_name: Julian
full_name: Leonard, Julian
id: b75b3f45-7995-11ef-9bfd-9a9cd02c3577
last_name: Leonard
- first_name: Sooshin
full_name: Kim, Sooshin
last_name: Kim
- first_name: Matthew
full_name: Rispoli, Matthew
last_name: Rispoli
- first_name: Alexander
full_name: Lukin, Alexander
last_name: Lukin
- first_name: Robert
full_name: Schittko, Robert
last_name: Schittko
- first_name: Joyce
full_name: Kwan, Joyce
last_name: Kwan
- first_name: Eugene
full_name: Demler, Eugene
last_name: Demler
- first_name: Dries
full_name: Sels, Dries
last_name: Sels
- first_name: Markus
full_name: Greiner, Markus
last_name: Greiner
citation:
ama: Leonard J, Kim S, Rispoli M, et al. Probing the onset of quantum avalanches
in a many-body localized system. Nature Physics. 2023;19(4):481-485. doi:10.1038/s41567-022-01887-3
apa: Leonard, J., Kim, S., Rispoli, M., Lukin, A., Schittko, R., Kwan, J., … Greiner,
M. (2023). Probing the onset of quantum avalanches in a many-body localized system.
Nature Physics. Springer Nature. https://doi.org/10.1038/s41567-022-01887-3
chicago: Leonard, Julian, Sooshin Kim, Matthew Rispoli, Alexander Lukin, Robert
Schittko, Joyce Kwan, Eugene Demler, Dries Sels, and Markus Greiner. “Probing
the Onset of Quantum Avalanches in a Many-Body Localized System.” Nature Physics.
Springer Nature, 2023. https://doi.org/10.1038/s41567-022-01887-3.
ieee: J. Leonard et al., “Probing the onset of quantum avalanches in a many-body
localized system,” Nature Physics, vol. 19, no. 4. Springer Nature, pp.
481–485, 2023.
ista: Leonard J, Kim S, Rispoli M, Lukin A, Schittko R, Kwan J, Demler E, Sels D,
Greiner M. 2023. Probing the onset of quantum avalanches in a many-body localized
system. Nature Physics. 19(4), 481–485.
mla: Leonard, Julian, et al. “Probing the Onset of Quantum Avalanches in a Many-Body
Localized System.” Nature Physics, vol. 19, no. 4, Springer Nature, 2023,
pp. 481–85, doi:10.1038/s41567-022-01887-3.
short: J. Leonard, S. Kim, M. Rispoli, A. Lukin, R. Schittko, J. Kwan, E. Demler,
D. Sels, M. Greiner, Nature Physics 19 (2023) 481–485.
date_created: 2024-10-07T11:46:33Z
date_published: 2023-01-26T00:00:00Z
date_updated: 2024-10-08T10:52:08Z
day: '26'
doi: 10.1038/s41567-022-01887-3
extern: '1'
external_id:
arxiv:
- '2012.15270'
intvolume: ' 19'
issue: '4'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.48550/arXiv.2012.15270
month: '01'
oa: 1
oa_version: Preprint
page: 481-485
publication: Nature Physics
publication_identifier:
eissn:
- 1745-2481
issn:
- 1745-2473
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
scopus_import: '1'
status: public
title: Probing the onset of quantum avalanches in a many-body localized system
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 19
year: '2023'
...
---
_id: '18191'
abstract:
- lang: eng
text: 'Large-scale quantum devices provide insights beyond the reach of classical
simulations. However, for a reliable and verifiable quantum simulation, the building
blocks of the quantum device require exquisite benchmarking. This benchmarking
of large-scale dynamical quantum systems represents a major challenge due to lack
of efficient tools for their simulation. Here, we present a scalable algorithm
based on neural networks for Hamiltonian tomography in out-of-equilibrium quantum
systems. We illustrate our approach using a model for a forefront quantum simulation
platform: ultracold atoms in optical lattices. Specifically, we show that our
algorithm is able to reconstruct the Hamiltonian of an arbitrary sized bosonic
ladder system using an accessible amount of experimental measurements. We are
able to significantly increase the previously known parameter precision.'
article_number: '023302'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Agnes
full_name: Valenti, Agnes
last_name: Valenti
- first_name: Guliuxin
full_name: Jin, Guliuxin
last_name: Jin
- first_name: Julian
full_name: Leonard, Julian
id: b75b3f45-7995-11ef-9bfd-9a9cd02c3577
last_name: Leonard
- first_name: Sebastian D.
full_name: Huber, Sebastian D.
last_name: Huber
- first_name: Eliska
full_name: Greplova, Eliska
last_name: Greplova
citation:
ama: Valenti A, Jin G, Leonard J, Huber SD, Greplova E. Scalable Hamiltonian learning
for large-scale out-of-equilibrium quantum dynamics. Physical Review A.
2022;105(2). doi:10.1103/physreva.105.023302
apa: Valenti, A., Jin, G., Leonard, J., Huber, S. D., & Greplova, E. (2022).
Scalable Hamiltonian learning for large-scale out-of-equilibrium quantum dynamics.
Physical Review A. American Physical Society. https://doi.org/10.1103/physreva.105.023302
chicago: Valenti, Agnes, Guliuxin Jin, Julian Leonard, Sebastian D. Huber, and Eliska
Greplova. “Scalable Hamiltonian Learning for Large-Scale out-of-Equilibrium Quantum
Dynamics.” Physical Review A. American Physical Society, 2022. https://doi.org/10.1103/physreva.105.023302.
ieee: A. Valenti, G. Jin, J. Leonard, S. D. Huber, and E. Greplova, “Scalable Hamiltonian
learning for large-scale out-of-equilibrium quantum dynamics,” Physical Review
A, vol. 105, no. 2. American Physical Society, 2022.
ista: Valenti A, Jin G, Leonard J, Huber SD, Greplova E. 2022. Scalable Hamiltonian
learning for large-scale out-of-equilibrium quantum dynamics. Physical Review
A. 105(2), 023302.
mla: Valenti, Agnes, et al. “Scalable Hamiltonian Learning for Large-Scale out-of-Equilibrium
Quantum Dynamics.” Physical Review A, vol. 105, no. 2, 023302, American
Physical Society, 2022, doi:10.1103/physreva.105.023302.
short: A. Valenti, G. Jin, J. Leonard, S.D. Huber, E. Greplova, Physical Review
A 105 (2022).
date_created: 2024-10-07T11:46:53Z
date_published: 2022-02-01T00:00:00Z
date_updated: 2024-10-08T10:00:23Z
day: '01'
doi: 10.1103/physreva.105.023302
extern: '1'
external_id:
arxiv:
- '2103.01240'
intvolume: ' 105'
issue: '2'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.48550/arXiv.2103.01240
month: '02'
oa: 1
oa_version: Preprint
publication: Physical Review A
publication_identifier:
eissn:
- 2469-9934
issn:
- 2469-9926
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Scalable Hamiltonian learning for large-scale out-of-equilibrium quantum dynamics
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 105
year: '2022'
...
---
_id: '18192'
abstract:
- lang: eng
text: Current quantum simulation experiments are starting to explore nonequilibrium
many-body dynamics in previously inaccessible regimes in terms of system sizes
and timescales. Therefore, the question emerges as to which observables are best
suited to study the dynamics in such quantum many-body systems. Using machine
learning techniques, we investigate the dynamics and, in particular, the thermalization
behavior of an interacting quantum system that undergoes a nonequilibrium phase
transition from an ergodic to a many-body localized phase. We employ supervised
and unsupervised training methods to distinguish nonequilibrium from equilibrium
data, using the network performance as a probe for the thermalization behavior
of the system. We test our methods with experimental snapshots of ultracold atoms
taken with a quantum gas microscope. Our results provide a path to analyze highly
entangled large-scale quantum states for system sizes where numerical calculations
of conventional observables become challenging.
article_number: '150504'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: A.
full_name: Bohrdt, A.
last_name: Bohrdt
- first_name: S.
full_name: Kim, S.
last_name: Kim
- first_name: A.
full_name: Lukin, A.
last_name: Lukin
- first_name: M.
full_name: Rispoli, M.
last_name: Rispoli
- first_name: R.
full_name: Schittko, R.
last_name: Schittko
- first_name: M.
full_name: Knap, M.
last_name: Knap
- first_name: M.
full_name: Greiner, M.
last_name: Greiner
- first_name: Julian
full_name: Leonard, Julian
id: b75b3f45-7995-11ef-9bfd-9a9cd02c3577
last_name: Leonard
citation:
ama: Bohrdt A, Kim S, Lukin A, et al. Analyzing nonequilibrium quantum states through
snapshots with artificial neural networks. Physical Review Letters. 2021;127(15).
doi:10.1103/physrevlett.127.150504
apa: Bohrdt, A., Kim, S., Lukin, A., Rispoli, M., Schittko, R., Knap, M., … Leonard,
J. (2021). Analyzing nonequilibrium quantum states through snapshots with artificial
neural networks. Physical Review Letters. American Physical Society. https://doi.org/10.1103/physrevlett.127.150504
chicago: Bohrdt, A., S. Kim, A. Lukin, M. Rispoli, R. Schittko, M. Knap, M. Greiner,
and Julian Leonard. “Analyzing Nonequilibrium Quantum States through Snapshots
with Artificial Neural Networks.” Physical Review Letters. American Physical
Society, 2021. https://doi.org/10.1103/physrevlett.127.150504.
ieee: A. Bohrdt et al., “Analyzing nonequilibrium quantum states through
snapshots with artificial neural networks,” Physical Review Letters, vol.
127, no. 15. American Physical Society, 2021.
ista: Bohrdt A, Kim S, Lukin A, Rispoli M, Schittko R, Knap M, Greiner M, Leonard
J. 2021. Analyzing nonequilibrium quantum states through snapshots with artificial
neural networks. Physical Review Letters. 127(15), 150504.
mla: Bohrdt, A., et al. “Analyzing Nonequilibrium Quantum States through Snapshots
with Artificial Neural Networks.” Physical Review Letters, vol. 127, no.
15, 150504, American Physical Society, 2021, doi:10.1103/physrevlett.127.150504.
short: A. Bohrdt, S. Kim, A. Lukin, M. Rispoli, R. Schittko, M. Knap, M. Greiner,
J. Leonard, Physical Review Letters 127 (2021).
date_created: 2024-10-07T11:47:11Z
date_published: 2021-10-08T00:00:00Z
date_updated: 2024-10-08T09:58:03Z
day: '08'
doi: 10.1103/physrevlett.127.150504
extern: '1'
external_id:
arxiv:
- '2012.11586'
intvolume: ' 127'
issue: '15'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.48550/arXiv.2012.11586
month: '10'
oa: 1
oa_version: Preprint
publication: Physical Review Letters
publication_identifier:
issn:
- 0031-9007
- 1079-7114
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Analyzing nonequilibrium quantum states through snapshots with artificial neural
networks
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 127
year: '2021'
...
---
_id: '18193'
abstract:
- lang: eng
text: "Topological states of matter, such as fractional quantum Hall states, are
an active field of research due to their exotic excitations. In particular, ultracold
atoms in optical lattices provide a highly controllable and adaptable platform
to study such new types of quantum matter. However, finding a clear route to realize
non-Abelian quantum Hall states in these systems remains challenging. Here we
use the density-matrix renormalization-group (DMRG) method to study the Hofstadter-Bose-Hubbard
model at filling factor \U0001D708=1 and find strong indications that at \U0001D6FC=1/6
magnetic flux quanta per plaquette the ground state is a lattice analog of the
continuum non-Abelian Pfaffian. We study the on-site correlations of the ground
state, which indicate its paired nature at \U0001D708=1, and find an incompressible
state characterized by a charge gap in the bulk. We argue that the emergence of
a charge density wave on thin cylinders and the behavior of the two- and three-particle
correlation functions at short distances provide evidence for the state being
closely related to the continuum Pfaffian. The signatures discussed in this letter
are accessible in current cold atom experiments and we show that the Pfaffian-like
state is readily realizable in few-body systems using adiabatic preparation schemes."
article_number: L161101
article_processing_charge: No
article_type: letter_note
arxiv: 1
author:
- first_name: F. A.
full_name: Palm, F. A.
last_name: Palm
- first_name: M.
full_name: Buser, M.
last_name: Buser
- first_name: Julian
full_name: Leonard, Julian
id: b75b3f45-7995-11ef-9bfd-9a9cd02c3577
last_name: Leonard
- first_name: M.
full_name: Aidelsburger, M.
last_name: Aidelsburger
- first_name: U.
full_name: Schollwöck, U.
last_name: Schollwöck
- first_name: F.
full_name: Grusdt, F.
last_name: Grusdt
citation:
ama: Palm FA, Buser M, Leonard J, Aidelsburger M, Schollwöck U, Grusdt F. Bosonic
Pfaffian state in the Hofstadter-Bose-Hubbard model. Physical Review B.
2021;103(16). doi:10.1103/physrevb.103.l161101
apa: Palm, F. A., Buser, M., Leonard, J., Aidelsburger, M., Schollwöck, U., &
Grusdt, F. (2021). Bosonic Pfaffian state in the Hofstadter-Bose-Hubbard model.
Physical Review B. American Physical Society. https://doi.org/10.1103/physrevb.103.l161101
chicago: Palm, F. A., M. Buser, Julian Leonard, M. Aidelsburger, U. Schollwöck,
and F. Grusdt. “Bosonic Pfaffian State in the Hofstadter-Bose-Hubbard Model.”
Physical Review B. American Physical Society, 2021. https://doi.org/10.1103/physrevb.103.l161101.
ieee: F. A. Palm, M. Buser, J. Leonard, M. Aidelsburger, U. Schollwöck, and F. Grusdt,
“Bosonic Pfaffian state in the Hofstadter-Bose-Hubbard model,” Physical Review
B, vol. 103, no. 16. American Physical Society, 2021.
ista: Palm FA, Buser M, Leonard J, Aidelsburger M, Schollwöck U, Grusdt F. 2021.
Bosonic Pfaffian state in the Hofstadter-Bose-Hubbard model. Physical Review B.
103(16), L161101.
mla: Palm, F. A., et al. “Bosonic Pfaffian State in the Hofstadter-Bose-Hubbard
Model.” Physical Review B, vol. 103, no. 16, L161101, American Physical
Society, 2021, doi:10.1103/physrevb.103.l161101.
short: F.A. Palm, M. Buser, J. Leonard, M. Aidelsburger, U. Schollwöck, F. Grusdt,
Physical Review B 103 (2021).
date_created: 2024-10-07T11:47:51Z
date_published: 2021-04-15T00:00:00Z
date_updated: 2024-10-08T09:55:46Z
day: '15'
doi: 10.1103/physrevb.103.l161101
extern: '1'
external_id:
arxiv:
- '2011.02477'
intvolume: ' 103'
issue: '16'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.48550/arXiv.2011.02477
month: '04'
oa: 1
oa_version: Preprint
publication: Physical Review B
publication_identifier:
eissn:
- 2469-9969
issn:
- 2469-9950
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Bosonic Pfaffian state in the Hofstadter-Bose-Hubbard model
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 103
year: '2021'
...
---
_id: '18194'
abstract:
- lang: eng
text: 'Realizing strongly correlated topological phases of ultracold gases is a
central goal for ongoing experiments. While fractional quantum Hall states could
soon be implemented in small atomic ensembles, detecting their signatures in few-particle
settings remains a fundamental challenge. In this work, we numerically analyze
the center-of-mass Hall drift of a small ensemble of hardcore bosons, initially
prepared in the ground state of the Harper-Hofstadter-Hubbard model in a box potential.
By monitoring the Hall drift upon release, for a wide range of magnetic flux values,
we identify an emergent Hall plateau compatible with a fractional Chern insulator
state: The extracted Hall conductivity approaches a fractional value determined
by the many-body Chern number, while the width of the plateau agrees with the
spectral and topological properties of the prepared ground state. Besides, a direct
application of Streda''s formula indicates that such Hall plateaus can also be
directly obtained from static density-profile measurements. Our calculations suggest
that fractional Chern insulators can be detected in cold-atom experiments, using
available detection methods.'
article_number: '063316'
article_processing_charge: Yes (in subscription journal)
article_type: original
arxiv: 1
author:
- first_name: C.
full_name: Repellin, C.
last_name: Repellin
- first_name: Julian
full_name: Leonard, Julian
id: b75b3f45-7995-11ef-9bfd-9a9cd02c3577
last_name: Leonard
- first_name: N.
full_name: Goldman, N.
last_name: Goldman
citation:
ama: 'Repellin C, Leonard J, Goldman N. Fractional Chern insulators of few bosons
in a box: Hall plateaus from center-of-mass drifts and density profiles. Physical
Review A. 2020;102(6). doi:10.1103/physreva.102.063316'
apa: 'Repellin, C., Leonard, J., & Goldman, N. (2020). Fractional Chern insulators
of few bosons in a box: Hall plateaus from center-of-mass drifts and density profiles.
Physical Review A. American Physical Society. https://doi.org/10.1103/physreva.102.063316'
chicago: 'Repellin, C., Julian Leonard, and N. Goldman. “Fractional Chern Insulators
of Few Bosons in a Box: Hall Plateaus from Center-of-Mass Drifts and Density Profiles.”
Physical Review A. American Physical Society, 2020. https://doi.org/10.1103/physreva.102.063316.'
ieee: 'C. Repellin, J. Leonard, and N. Goldman, “Fractional Chern insulators of
few bosons in a box: Hall plateaus from center-of-mass drifts and density profiles,”
Physical Review A, vol. 102, no. 6. American Physical Society, 2020.'
ista: 'Repellin C, Leonard J, Goldman N. 2020. Fractional Chern insulators of few
bosons in a box: Hall plateaus from center-of-mass drifts and density profiles.
Physical Review A. 102(6), 063316.'
mla: 'Repellin, C., et al. “Fractional Chern Insulators of Few Bosons in a Box:
Hall Plateaus from Center-of-Mass Drifts and Density Profiles.” Physical Review
A, vol. 102, no. 6, 063316, American Physical Society, 2020, doi:10.1103/physreva.102.063316.'
short: C. Repellin, J. Leonard, N. Goldman, Physical Review A 102 (2020).
date_created: 2024-10-07T11:48:07Z
date_published: 2020-12-14T00:00:00Z
date_updated: 2024-10-08T09:51:57Z
day: '14'
ddc:
- '530'
doi: 10.1103/physreva.102.063316
extern: '1'
external_id:
arxiv:
- '2005.09689'
has_accepted_license: '1'
intvolume: ' 102'
issue: '6'
language:
- iso: eng
license: https://creativecommons.org/licenses/by/4.0/
main_file_link:
- open_access: '1'
url: https://doi.org/10.1103/PhysRevA.102.063316
month: '12'
oa: 1
oa_version: Published Version
publication: Physical Review A
publication_identifier:
eissn:
- 2469-9934
issn:
- 2469-9926
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'Fractional Chern insulators of few bosons in a box: Hall plateaus from center-of-mass
drifts and density profiles'
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: 102
year: '2020'
...
---
_id: '18195'
abstract:
- lang: eng
text: Phase transitions are driven by collective fluctuations of a system’s constituents
that emerge at a critical point1. This mechanism has been extensively explored
for classical and quantum systems in equilibrium, whose critical behaviour is
described by the general theory of phase transitions. Recently, however, fundamentally
distinct phase transitions have been discovered for out-of-equilibrium quantum
systems, which can exhibit critical behaviour that defies this description and
is not well understood1. A paradigmatic example is the many-body localization
(MBL) transition, which marks the breakdown of thermalization in an isolated quantum
many-body system as its disorder increases beyond a critical value2,3,4,5,6,7,8,9,10,11.
Characterizing quantum critical behaviour in an MBL system requires probing its
entanglement over space and time4,5,7, which has proved experimentally challenging
owing to stringent requirements on quantum state preparation and system isolation.
Here we observe quantum critical behaviour at the MBL transition in a disordered
Bose–Hubbard system and characterize its entanglement via its multi-point quantum
correlations. We observe the emergence of strong correlations, accompanied by
the onset of anomalous diffusive transport throughout the system, and verify their
critical nature by measuring their dependence on the system size. The correlations
extend to high orders in the quantum critical regime and appear to form via a
sparse network of many-body resonances that spans the entire system12,13. Our
results connect the macroscopic phenomenology of the transition to the system’s
microscopic structure of quantum correlations, and they provide an essential step
towards understanding criticality and universality in non-equilibrium systems1,7,13.
article_processing_charge: No
article_type: letter_note
arxiv: 1
author:
- first_name: Matthew
full_name: Rispoli, Matthew
last_name: Rispoli
- first_name: Alexander
full_name: Lukin, Alexander
last_name: Lukin
- first_name: Robert
full_name: Schittko, Robert
last_name: Schittko
- first_name: Sooshin
full_name: Kim, Sooshin
last_name: Kim
- first_name: M. Eric
full_name: Tai, M. Eric
last_name: Tai
- first_name: Julian
full_name: Leonard, Julian
id: b75b3f45-7995-11ef-9bfd-9a9cd02c3577
last_name: Leonard
- first_name: Markus
full_name: Greiner, Markus
last_name: Greiner
citation:
ama: Rispoli M, Lukin A, Schittko R, et al. Quantum critical behaviour at the many-body
localization transition. Nature. 2019;573(7774):385-389. doi:10.1038/s41586-019-1527-2
apa: Rispoli, M., Lukin, A., Schittko, R., Kim, S., Tai, M. E., Leonard, J., &
Greiner, M. (2019). Quantum critical behaviour at the many-body localization transition.
Nature. Springer Nature. https://doi.org/10.1038/s41586-019-1527-2
chicago: Rispoli, Matthew, Alexander Lukin, Robert Schittko, Sooshin Kim, M. Eric
Tai, Julian Leonard, and Markus Greiner. “Quantum Critical Behaviour at the Many-Body
Localization Transition.” Nature. Springer Nature, 2019. https://doi.org/10.1038/s41586-019-1527-2.
ieee: M. Rispoli et al., “Quantum critical behaviour at the many-body localization
transition,” Nature, vol. 573, no. 7774. Springer Nature, pp. 385–389,
2019.
ista: Rispoli M, Lukin A, Schittko R, Kim S, Tai ME, Leonard J, Greiner M. 2019.
Quantum critical behaviour at the many-body localization transition. Nature. 573(7774),
385–389.
mla: Rispoli, Matthew, et al. “Quantum Critical Behaviour at the Many-Body Localization
Transition.” Nature, vol. 573, no. 7774, Springer Nature, 2019, pp. 385–89,
doi:10.1038/s41586-019-1527-2.
short: M. Rispoli, A. Lukin, R. Schittko, S. Kim, M.E. Tai, J. Leonard, M. Greiner,
Nature 573 (2019) 385–389.
date_created: 2024-10-07T11:48:26Z
date_published: 2019-09-04T00:00:00Z
date_updated: 2024-10-08T09:33:30Z
day: '04'
doi: 10.1038/s41586-019-1527-2
extern: '1'
external_id:
arxiv:
- '1812.06959'
pmid:
- '31485075'
intvolume: ' 573'
issue: '7774'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.48550/arXiv.1812.06959
month: '09'
oa: 1
oa_version: Preprint
page: 385-389
pmid: 1
publication: Nature
publication_identifier:
eissn:
- 1476-4687
issn:
- 0028-0836
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
scopus_import: '1'
status: public
title: Quantum critical behaviour at the many-body localization transition
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 573
year: '2019'
...
---
_id: '18196'
abstract:
- lang: eng
text: An interacting quantum system that is subject to disorder may cease to thermalize
owing to localization of its constituents, thereby marking the breakdown of thermodynamics.
The key to understanding this phenomenon lies in the system’s entanglement, which
is experimentally challenging to measure. We realize such a many-body–localized
system in a disordered Bose-Hubbard chain and characterize its entanglement properties
through particle fluctuations and correlations. We observe that the particles
become localized, suppressing transport and preventing the thermalization of subsystems.
Notably, we measure the development of nonlocal correlations, whose evolution
is consistent with a logarithmic growth of entanglement entropy, the hallmark
of many-body localization. Our work experimentally establishes many-body localization
as a qualitatively distinct phenomenon from localization in noninteracting, disordered
systems.
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Alexander
full_name: Lukin, Alexander
last_name: Lukin
- first_name: Matthew
full_name: Rispoli, Matthew
last_name: Rispoli
- first_name: Robert
full_name: Schittko, Robert
last_name: Schittko
- first_name: M. Eric
full_name: Tai, M. Eric
last_name: Tai
- first_name: Adam M.
full_name: Kaufman, Adam M.
last_name: Kaufman
- first_name: Soonwon
full_name: Choi, Soonwon
last_name: Choi
- first_name: Vedika
full_name: Khemani, Vedika
last_name: Khemani
- first_name: Julian
full_name: Leonard, Julian
id: b75b3f45-7995-11ef-9bfd-9a9cd02c3577
last_name: Leonard
- first_name: Markus
full_name: Greiner, Markus
last_name: Greiner
citation:
ama: Lukin A, Rispoli M, Schittko R, et al. Probing entanglement in a many-body–localized
system. Science. 2019;364(6437):256-260. doi:10.1126/science.aau0818
apa: Lukin, A., Rispoli, M., Schittko, R., Tai, M. E., Kaufman, A. M., Choi, S.,
… Greiner, M. (2019). Probing entanglement in a many-body–localized system. Science.
American Association for the Advancement of Science. https://doi.org/10.1126/science.aau0818
chicago: Lukin, Alexander, Matthew Rispoli, Robert Schittko, M. Eric Tai, Adam M.
Kaufman, Soonwon Choi, Vedika Khemani, Julian Leonard, and Markus Greiner. “Probing
Entanglement in a Many-Body–Localized System.” Science. American Association
for the Advancement of Science, 2019. https://doi.org/10.1126/science.aau0818.
ieee: A. Lukin et al., “Probing entanglement in a many-body–localized system,”
Science, vol. 364, no. 6437. American Association for the Advancement of
Science, pp. 256–260, 2019.
ista: Lukin A, Rispoli M, Schittko R, Tai ME, Kaufman AM, Choi S, Khemani V, Leonard
J, Greiner M. 2019. Probing entanglement in a many-body–localized system. Science.
364(6437), 256–260.
mla: Lukin, Alexander, et al. “Probing Entanglement in a Many-Body–Localized System.”
Science, vol. 364, no. 6437, American Association for the Advancement of
Science, 2019, pp. 256–60, doi:10.1126/science.aau0818.
short: A. Lukin, M. Rispoli, R. Schittko, M.E. Tai, A.M. Kaufman, S. Choi, V. Khemani,
J. Leonard, M. Greiner, Science 364 (2019) 256–260.
date_created: 2024-10-07T11:48:43Z
date_published: 2019-04-19T00:00:00Z
date_updated: 2024-10-08T09:28:42Z
day: '19'
doi: 10.1126/science.aau0818
extern: '1'
external_id:
arxiv:
- '1805.09819'
intvolume: ' 364'
issue: '6437'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.48550/arXiv.1805.09819
month: '04'
oa: 1
oa_version: Preprint
page: 256-260
publication: Science
publication_identifier:
eissn:
- 1095-9203
issn:
- 0036-8075
publication_status: published
publisher: American Association for the Advancement of Science
quality_controlled: '1'
scopus_import: '1'
status: public
title: Probing entanglement in a many-body–localized system
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 364
year: '2019'
...
---
_id: '18197'
abstract:
- lang: eng
text: Controlling matter to simultaneously support coupled properties is of fundamental
and technological importance1 (for example, in multiferroics2,3,4,5 or high-temperature
superconductors6,7,8,9). However, determining the microscopic mechanisms responsible
for the simultaneous presence of different orders is difficult, making it hard
to predict material phenomenology10,11 or modify properties12,13,14,15,16. Here,
using a quantum gas to engineer an adjustable interaction at the microscopic level,
we demonstrate scenarios of competition, coexistence and mutual enhancement of
two orders. For the enhancement scenario, the presence of one order lowers the
critical point of the other. Our system is realized by a Bose–Einstein condensate
that can undergo self-organization phase transitions in two optical resonators17,
resulting in two distinct crystalline density orders. We characterize the coupling
between these orders by measuring the composite order parameter and the elementary
excitations and explain our results with a mean-field free-energy model derived
from a microscopic Hamiltonian. Our system is ideally suited to explore quantum
tricritical points18 and can be extended to study the interplay of spin and density
orders19 as a function of temperature20.
article_processing_charge: No
article_type: letter_note
arxiv: 1
author:
- first_name: Andrea
full_name: Morales, Andrea
last_name: Morales
- first_name: Philip
full_name: Zupancic, Philip
last_name: Zupancic
- first_name: Julian
full_name: Leonard, Julian
id: b75b3f45-7995-11ef-9bfd-9a9cd02c3577
last_name: Leonard
- first_name: Tilman
full_name: Esslinger, Tilman
last_name: Esslinger
- first_name: Tobias
full_name: Donner, Tobias
last_name: Donner
citation:
ama: Morales A, Zupancic P, Leonard J, Esslinger T, Donner T. Coupling two order
parameters in a quantum gas. Nature Materials. 2018;17(8):686-690. doi:10.1038/s41563-018-0118-1
apa: Morales, A., Zupancic, P., Leonard, J., Esslinger, T., & Donner, T. (2018).
Coupling two order parameters in a quantum gas. Nature Materials. Springer
Nature. https://doi.org/10.1038/s41563-018-0118-1
chicago: Morales, Andrea, Philip Zupancic, Julian Leonard, Tilman Esslinger, and
Tobias Donner. “Coupling Two Order Parameters in a Quantum Gas.” Nature Materials.
Springer Nature, 2018. https://doi.org/10.1038/s41563-018-0118-1.
ieee: A. Morales, P. Zupancic, J. Leonard, T. Esslinger, and T. Donner, “Coupling
two order parameters in a quantum gas,” Nature Materials, vol. 17, no.
8. Springer Nature, pp. 686–690, 2018.
ista: Morales A, Zupancic P, Leonard J, Esslinger T, Donner T. 2018. Coupling two
order parameters in a quantum gas. Nature Materials. 17(8), 686–690.
mla: Morales, Andrea, et al. “Coupling Two Order Parameters in a Quantum Gas.” Nature
Materials, vol. 17, no. 8, Springer Nature, 2018, pp. 686–90, doi:10.1038/s41563-018-0118-1.
short: A. Morales, P. Zupancic, J. Leonard, T. Esslinger, T. Donner, Nature Materials
17 (2018) 686–690.
date_created: 2024-10-07T11:48:59Z
date_published: 2018-08-01T00:00:00Z
date_updated: 2024-10-07T12:15:41Z
day: '01'
doi: 10.1038/s41563-018-0118-1
extern: '1'
external_id:
arxiv:
- '1711.07988'
intvolume: ' 17'
issue: '8'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.48550/arXiv.1711.07988
month: '08'
oa: 1
oa_version: Preprint
page: 686-690
publication: Nature Materials
publication_identifier:
eissn:
- 1476-4660
issn:
- 1476-1122
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
scopus_import: '1'
status: public
title: Coupling two order parameters in a quantum gas
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 17
year: '2018'
...
---
_id: '18198'
abstract:
- lang: eng
text: Higgs and Goldstone modes are collective excitations of the amplitude and
phase of an order parameter that is related to the breaking of a continuous symmetry.
We directly studied these modes in a supersolid quantum gas created by coupling
a Bose-Einstein condensate to two optical cavities, whose field amplitudes form
the real and imaginary parts of a U(1)-symmetric order parameter. Monitoring the
cavity fields in real time allowed us to observe the dynamics of the associated
Higgs and Goldstone modes and revealed their amplitude and phase nature. We used
a spectroscopic method to measure their frequencies, and we gave a tunable mass
to the Goldstone mode by exploring the crossover between continuous and discrete
symmetry. Our experiments link spectroscopic measurements to the theoretical concept
of Higgs and Goldstone modes.
article_processing_charge: No
article_type: letter_note
author:
- first_name: Julian
full_name: Leonard, Julian
id: b75b3f45-7995-11ef-9bfd-9a9cd02c3577
last_name: Leonard
- first_name: Andrea
full_name: Morales, Andrea
last_name: Morales
- first_name: Philip
full_name: Zupancic, Philip
last_name: Zupancic
- first_name: Tobias
full_name: Donner, Tobias
last_name: Donner
- first_name: Tilman
full_name: Esslinger, Tilman
last_name: Esslinger
citation:
ama: Leonard J, Morales A, Zupancic P, Donner T, Esslinger T. Monitoring and manipulating
Higgs and Goldstone modes in a supersolid quantum gas. Science. 2017;358(6369):1415-1418.
doi:10.1126/science.aan2608
apa: Leonard, J., Morales, A., Zupancic, P., Donner, T., & Esslinger, T. (2017).
Monitoring and manipulating Higgs and Goldstone modes in a supersolid quantum
gas. Science. American Association for the Advancement of Science. https://doi.org/10.1126/science.aan2608
chicago: Leonard, Julian, Andrea Morales, Philip Zupancic, Tobias Donner, and Tilman
Esslinger. “Monitoring and Manipulating Higgs and Goldstone Modes in a Supersolid
Quantum Gas.” Science. American Association for the Advancement of Science,
2017. https://doi.org/10.1126/science.aan2608.
ieee: J. Leonard, A. Morales, P. Zupancic, T. Donner, and T. Esslinger, “Monitoring
and manipulating Higgs and Goldstone modes in a supersolid quantum gas,” Science,
vol. 358, no. 6369. American Association for the Advancement of Science, pp. 1415–1418,
2017.
ista: Leonard J, Morales A, Zupancic P, Donner T, Esslinger T. 2017. Monitoring
and manipulating Higgs and Goldstone modes in a supersolid quantum gas. Science.
358(6369), 1415–1418.
mla: Leonard, Julian, et al. “Monitoring and Manipulating Higgs and Goldstone Modes
in a Supersolid Quantum Gas.” Science, vol. 358, no. 6369, American Association
for the Advancement of Science, 2017, pp. 1415–18, doi:10.1126/science.aan2608.
short: J. Leonard, A. Morales, P. Zupancic, T. Donner, T. Esslinger, Science 358
(2017) 1415–1418.
date_created: 2024-10-07T11:49:27Z
date_published: 2017-12-15T00:00:00Z
date_updated: 2024-10-07T12:12:46Z
day: '15'
doi: 10.1126/science.aan2608
extern: '1'
external_id:
pmid:
- '29242343'
intvolume: ' 358'
issue: '6369'
language:
- iso: eng
month: '12'
oa_version: None
page: 1415-1418
pmid: 1
publication: Science
publication_identifier:
eissn:
- 1095-9203
issn:
- 0036-8075
publication_status: published
publisher: American Association for the Advancement of Science
quality_controlled: '1'
scopus_import: '1'
status: public
title: Monitoring and manipulating Higgs and Goldstone modes in a supersolid quantum
gas
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 358
year: '2017'
...
---
_id: '18199'
abstract:
- lang: eng
text: 'The concept of a supersolid state combines the crystallization of a many-body
system with dissipationless flow of the atoms from which it is built. This quantum
phase requires the breaking of two continuous symmetries: the phase invariance
of a superfluid and the continuous translational invariance to form the crystal1,2.
Despite having been proposed for helium almost 50 years ago3,4, experimental verification
of supersolidity remains elusive5,6. A variant with only discrete translational
symmetry breaking on a preimposed lattice structure—the ‘lattice supersolid’7—has
been realized, based on self-organization of a Bose–Einstein condensate8,9. However,
lattice supersolids do not feature the continuous ground-state degeneracy that
characterizes the supersolid state as originally proposed. Here we report the
realization of a supersolid with continuous translational symmetry breaking along
one direction in a quantum gas. The continuous symmetry that is broken emerges
from two discrete spatial symmetries by symmetrically coupling a Bose–Einstein
condensate to the modes of two optical cavities. We establish the phase coherence
of the supersolid and find a high ground-state degeneracy by measuring the crystal
position over many realizations through the light fields that leak from the cavities.
These light fields are also used to monitor the position fluctuations in real
time. Our concept provides a route to creating and studying glassy many-body systems
with controllably lifted ground-state degeneracies, such as supersolids in the
presence of disorder.'
article_processing_charge: No
article_type: letter_note
author:
- first_name: Julian
full_name: Leonard, Julian
id: b75b3f45-7995-11ef-9bfd-9a9cd02c3577
last_name: Leonard
- first_name: Andrea
full_name: Morales, Andrea
last_name: Morales
- first_name: Philip
full_name: Zupancic, Philip
last_name: Zupancic
- first_name: Tilman
full_name: Esslinger, Tilman
last_name: Esslinger
- first_name: Tobias
full_name: Donner, Tobias
last_name: Donner
citation:
ama: Leonard J, Morales A, Zupancic P, Esslinger T, Donner T. Supersolid formation
in a quantum gas breaking a continuous translational symmetry. Nature.
2017;543(7643):87-90. doi:10.1038/nature21067
apa: Leonard, J., Morales, A., Zupancic, P., Esslinger, T., & Donner, T. (2017).
Supersolid formation in a quantum gas breaking a continuous translational symmetry.
Nature. Springer Science and Business Media LLC. https://doi.org/10.1038/nature21067
chicago: Leonard, Julian, Andrea Morales, Philip Zupancic, Tilman Esslinger, and
Tobias Donner. “Supersolid Formation in a Quantum Gas Breaking a Continuous Translational
Symmetry.” Nature. Springer Science and Business Media LLC, 2017. https://doi.org/10.1038/nature21067.
ieee: J. Leonard, A. Morales, P. Zupancic, T. Esslinger, and T. Donner, “Supersolid
formation in a quantum gas breaking a continuous translational symmetry,” Nature,
vol. 543, no. 7643. Springer Science and Business Media LLC, pp. 87–90, 2017.
ista: Leonard J, Morales A, Zupancic P, Esslinger T, Donner T. 2017. Supersolid
formation in a quantum gas breaking a continuous translational symmetry. Nature.
543(7643), 87–90.
mla: Leonard, Julian, et al. “Supersolid Formation in a Quantum Gas Breaking a Continuous
Translational Symmetry.” Nature, vol. 543, no. 7643, Springer Science and
Business Media LLC, 2017, pp. 87–90, doi:10.1038/nature21067.
short: J. Leonard, A. Morales, P. Zupancic, T. Esslinger, T. Donner, Nature 543
(2017) 87–90.
date_created: 2024-10-07T11:49:44Z
date_published: 2017-03-02T00:00:00Z
date_updated: 2024-10-07T12:09:33Z
day: '02'
doi: 10.1038/nature21067
extern: '1'
intvolume: ' 543'
issue: '7643'
language:
- iso: eng
month: '03'
oa_version: None
page: 87-90
publication: Nature
publication_identifier:
issn:
- 0028-0836
- 1476-4687
publication_status: published
publisher: Springer Science and Business Media LLC
quality_controlled: '1'
scopus_import: '1'
status: public
title: Supersolid formation in a quantum gas breaking a continuous translational symmetry
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 543
year: '2017'
...
---
_id: '18200'
abstract:
- lang: eng
text: "We present an optical setup with focus-tunable lenses to dynamically control
the waist and focus position of a laser beam, in which we transport a trapped
ultracold cloud of 87Rb over a distance of \r\n. The scheme allows us to shift
the focus position at constant waist, providing uniform trapping conditions over
the full transport length. The fraction of atoms that are transported over the
entire distance comes near to unity, while the heating of the cloud is in the
range of a few microkelvin. We characterize the position stability of the focus
and show that residual drift rates in focus position can be compensated for by
counteracting with the tunable lenses. Beyond being a compact and robust scheme
to transport ultracold atoms, the reported control of laser beams makes dynamic
tailoring of trapping potentials possible. As an example, we steer the size of
the atomic cloud by changing the waist size of the dipole beam."
article_number: '093028'
article_processing_charge: Yes
article_type: original
author:
- first_name: Julian
full_name: Leonard, Julian
id: b75b3f45-7995-11ef-9bfd-9a9cd02c3577
last_name: Leonard
- first_name: Moonjoo
full_name: Lee, Moonjoo
last_name: Lee
- first_name: Andrea
full_name: Morales, Andrea
last_name: Morales
- first_name: Thomas M
full_name: Karg, Thomas M
last_name: Karg
- first_name: Tilman
full_name: Esslinger, Tilman
last_name: Esslinger
- first_name: Tobias
full_name: Donner, Tobias
last_name: Donner
citation:
ama: Leonard J, Lee M, Morales A, Karg TM, Esslinger T, Donner T. Optical transport
and manipulation of an ultracold atomic cloud using focus-tunable lenses. New
Journal of Physics. 2014;16(9). doi:10.1088/1367-2630/16/9/093028
apa: Leonard, J., Lee, M., Morales, A., Karg, T. M., Esslinger, T., & Donner,
T. (2014). Optical transport and manipulation of an ultracold atomic cloud using
focus-tunable lenses. New Journal of Physics. IOP Publishing. https://doi.org/10.1088/1367-2630/16/9/093028
chicago: Leonard, Julian, Moonjoo Lee, Andrea Morales, Thomas M Karg, Tilman Esslinger,
and Tobias Donner. “Optical Transport and Manipulation of an Ultracold Atomic
Cloud Using Focus-Tunable Lenses.” New Journal of Physics. IOP Publishing,
2014. https://doi.org/10.1088/1367-2630/16/9/093028.
ieee: J. Leonard, M. Lee, A. Morales, T. M. Karg, T. Esslinger, and T. Donner, “Optical
transport and manipulation of an ultracold atomic cloud using focus-tunable lenses,”
New Journal of Physics, vol. 16, no. 9. IOP Publishing, 2014.
ista: Leonard J, Lee M, Morales A, Karg TM, Esslinger T, Donner T. 2014. Optical
transport and manipulation of an ultracold atomic cloud using focus-tunable lenses.
New Journal of Physics. 16(9), 093028.
mla: Leonard, Julian, et al. “Optical Transport and Manipulation of an Ultracold
Atomic Cloud Using Focus-Tunable Lenses.” New Journal of Physics, vol.
16, no. 9, 093028, IOP Publishing, 2014, doi:10.1088/1367-2630/16/9/093028.
short: J. Leonard, M. Lee, A. Morales, T.M. Karg, T. Esslinger, T. Donner, New Journal
of Physics 16 (2014).
date_created: 2024-10-07T11:50:00Z
date_published: 2014-09-23T00:00:00Z
date_updated: 2024-10-07T12:07:48Z
day: '23'
doi: 10.1088/1367-2630/16/9/093028
extern: '1'
intvolume: ' 16'
issue: '9'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1088/1367-2630/16/9/093028
month: '09'
oa: 1
oa_version: Published Version
publication: New Journal of Physics
publication_identifier:
issn:
- 1367-2630
publication_status: published
publisher: IOP Publishing
quality_controlled: '1'
scopus_import: '1'
status: public
title: Optical transport and manipulation of an ultracold atomic cloud using focus-tunable
lenses
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 16
year: '2014'
...
---
_id: '18201'
abstract:
- lang: eng
text: Owing to thermal fluctuations, two-dimensional (2D) systems cannot undergo
a conventional phase transition associated with the breaking of a continuous symmetry1.
Nevertheless they may exhibit a phase transition to a state with quasi-long-range
order via the Berezinskii–Kosterlitz–Thouless (BKT) mechanism2. A paradigm example
is the 2D Bose fluid, such as a liquid helium film3, which cannot condense at
non-zero temperature although it becomes superfluid above a critical phase space
density. The quasi-long-range coherence and the microscopic nature of the BKT
transition were recently explored with ultracold atomic gases4,5,6. However, a
direct observation of superfluidity in terms of frictionless flow is still missing
for these systems. Here we probe the superfluidity of a 2D trapped Bose gas using
a moving obstacle formed by a micrometre-sized laser beam. We find a dramatic
variation of the response of the fluid, depending on its degree of degeneracy
at the obstacle location.
article_processing_charge: No
article_type: letter_note
arxiv: 1
author:
- first_name: Rémi
full_name: Desbuquois, Rémi
last_name: Desbuquois
- first_name: Lauriane
full_name: Chomaz, Lauriane
last_name: Chomaz
- first_name: Tarik
full_name: Yefsah, Tarik
last_name: Yefsah
- first_name: Julian
full_name: Leonard, Julian
id: b75b3f45-7995-11ef-9bfd-9a9cd02c3577
last_name: Leonard
- first_name: Jérôme
full_name: Beugnon, Jérôme
last_name: Beugnon
- first_name: Christof
full_name: Weitenberg, Christof
last_name: Weitenberg
- first_name: Jean
full_name: Dalibard, Jean
last_name: Dalibard
citation:
ama: Desbuquois R, Chomaz L, Yefsah T, et al. Superfluid behaviour of a two-dimensional
Bose gas. Nature Physics. 2012;8(9):645-648. doi:10.1038/nphys2378
apa: Desbuquois, R., Chomaz, L., Yefsah, T., Leonard, J., Beugnon, J., Weitenberg,
C., & Dalibard, J. (2012). Superfluid behaviour of a two-dimensional Bose
gas. Nature Physics. Springer Nature. https://doi.org/10.1038/nphys2378
chicago: Desbuquois, Rémi, Lauriane Chomaz, Tarik Yefsah, Julian Leonard, Jérôme
Beugnon, Christof Weitenberg, and Jean Dalibard. “Superfluid Behaviour of a Two-Dimensional
Bose Gas.” Nature Physics. Springer Nature, 2012. https://doi.org/10.1038/nphys2378.
ieee: R. Desbuquois et al., “Superfluid behaviour of a two-dimensional Bose
gas,” Nature Physics, vol. 8, no. 9. Springer Nature, pp. 645–648, 2012.
ista: Desbuquois R, Chomaz L, Yefsah T, Leonard J, Beugnon J, Weitenberg C, Dalibard
J. 2012. Superfluid behaviour of a two-dimensional Bose gas. Nature Physics. 8(9),
645–648.
mla: Desbuquois, Rémi, et al. “Superfluid Behaviour of a Two-Dimensional Bose Gas.”
Nature Physics, vol. 8, no. 9, Springer Nature, 2012, pp. 645–48, doi:10.1038/nphys2378.
short: R. Desbuquois, L. Chomaz, T. Yefsah, J. Leonard, J. Beugnon, C. Weitenberg,
J. Dalibard, Nature Physics 8 (2012) 645–648.
date_created: 2024-10-07T11:50:19Z
date_published: 2012-07-29T00:00:00Z
date_updated: 2024-10-07T12:05:22Z
day: '29'
doi: 10.1038/nphys2378
extern: '1'
external_id:
arxiv:
- '1205.4536'
intvolume: ' 8'
issue: '9'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1205.4536
month: '07'
oa: 1
oa_version: Preprint
page: 645-648
publication: Nature Physics
publication_identifier:
eissn:
- 1745-2481
issn:
- 1745-2473
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
scopus_import: '1'
status: public
title: Superfluid behaviour of a two-dimensional Bose gas
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 8
year: '2012'
...