Article
Physics, Multidisciplinary
Shun-Yao Zhang, Dong Yuan, Thomas Iadecola, Shenglong Xu, Dong-Ling Deng
Summary: This study proposes a matrix-product-state algorithm to extract nonthermal excited eigenstates in quantum many-body scarred systems, and applies it to various models, providing a new approach for future investigations of nonthermal excitations.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Z. Chen, Y. Y. Tsui, M. Z. Mo, R. Fedosejevs, T. Ozaki, V. Recoules, P. A. Sterne, A. Ng
Summary: We report on the study of electron kinetics induced by intense femtosecond laser excitation of electrons in the 5d band of Au. Changes in electron system are observed from the temporal evolution of ac conductivity and conduction electron density. The results reveal an increase of electron thermalization time with excitation energy density, contrary to the Fermi-liquid behavior, and uncover the shortening of 5d hole lifetime with the increase of photoexcitation rates, providing valuable insights for understanding electron kinetics under extreme nonequilibrium conditions.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Fluids & Plasmas
Dibyendu Roy, Divij Mishra, Tomaz Prosen
Summary: In this study, we investigate the spectral form factor in periodically kicked bosonic chains. By using the random phase approximation, we demonstrate that the spectral form factor can be rewritten in terms of a bistochastic many-body process generated by an effective bosonic Hamiltonian. This research provides important insights into the system size effects and the relationship between particle number and spectral properties.
Article
Physics, Fluids & Plasmas
Jae Sung Lee, Joonhyun Yeo
Summary: In this study, we investigate the Lindbladian quantum master equations (QMEs) and compare them with the Redfield equation. We find that the steady states of Lindbladian QMEs are different from the mean force Gibbs (MFG) state, especially when enforcing complete positivity. Furthermore, in the high-temperature regime, both the steady states of Lindbladian QMEs and the MFG state can be reduced to the Gibbs state of the system Hamiltonian under certain conditions.
Article
Physics, Fluids & Plasmas
Jason Iaconis, Andrew Lucas, Rahul Nandkishore
Summary: Subdiffusion is observed in chaotic many-body dynamics with multipole conservation laws and subsystem symmetries, as studied through numerical simulations of quantum automaton random unitary circuits. The results align well with recent hydrodynamic predictions for such theories.
Article
Physics, Particles & Fields
Mohammad Ali-Akbari, Mahsa Lezgi
Summary: In this study, holographic subregion complexity is investigated in a spatially anisotropic field theory. A new interpretation from the informational perspective is proposed to determine the stable and unstable thermodynamically solutions. The effect of anisotropy on holographic subregion complexity is observed to be decreasing.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Multidisciplinary
Bjarne Bergh, Martin Gaerttner
Summary: Entanglement is a crucial resource for many quantum technologies and fundamental physics questions. This text discusses deriving measurable lower bounds on distillable entanglement using entropic uncertainty relations for bipartite systems, and showcases their application to physical models realizable in cold-atom experiments. The derived entanglement bounds rely on measurements in only two different bases and are generically applicable to any quantum simulation platform.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Pieter W. Claeys, Austen Lamacraft
Summary: Dual-unitary quantum circuits can be used to construct lattice models for calculating dynamical correlations of local observables. The study presents analytical methods for constructing dual-unitary circuits with different levels of ergodicity/non-ergodicity and provides results on thermalization to infinite-temperature Gibbs state and generalized Gibbs ensemble, showing the addition of tunable perturbations can lead to prethermalization plateaux for local observables without breaking dual unitarity.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Magdalini Zonnios, Jesper Levinsen, Meera M. Parish, Felix A. Pollock, Kavan Modi
Summary: Motivated by the famous ink-drop experiment, the study proposes an experimentally implementable method for measuring the scrambling capacity of quantum processes. The researchers introduce a fully quantum version of the out of-time-order correlator, called the out-of-time-order tensor, which provides clear information about the chaoticity of a process.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
N. Maskara, A. A. Michailidis, W. W. Ho, D. Bluvstein, S. Choi, M. D. Lukin, M. Serbyn
Summary: Recent experiments in Rydberg atom arrays have shown that coherent revivals associated with quantum many-body scars can be stabilized by periodic driving. This behavior originates from spatiotemporal ordering in an effective Floquet unitary, displaying discrete time-crystalline behavior in a prethermal regime. The subharmonic response exists only for certain initial states and shows robustness to perturbations, suggesting a potential route to controlling entanglement in interacting quantum systems.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Ana Hudomal, Jean-Yves Desaules, Bhaskar Mukherjee, Guo-Xian Su, Jad C. Halimeh, Zlatko Papic
Summary: Periodic driving enhances quantum many-body scarring, but the mechanisms behind it are poorly understood. This study investigates the effect of periodic driving on the PXP model and finds that modulation of the chemical potential leads to a rich phase diagram and stabilizes quantum revivals.
Article
Physics, Multidisciplinary
Youssef Aziz Alaoui, Bihui Zhu, Sean Robert Muleady, William Dubosclard, Tommaso Roscilde, Ana Maria Rey, Bruno Laburthe-Tolra, Laurent Vernac
Summary: In this study, collective spin measurements are performed to investigate the development of two-body correlations between 104 spin s = 3 chromium atoms pinned in a 3D optical lattice. The interactions between spins are characterized by long range and anisotropic dipolar interactions. The fluctuations of total magnetization are measured to estimate the growth of connected pairwise correlations associated with magnetization, and the quantum nature of these correlations is assessed through comparisons with analytical expansions and numerical simulations.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Philipp Kunkel, Maximilian Pruefer, Stefan Lannig, Robin Strohmaier, Martin Gaerttner, Helmut Strobel, Markus K. Oberthaler
Summary: A prerequisite for understanding many-body quantum systems is to characterize them in terms of their entanglement structure. However, detecting entanglement in spatially extended many-body systems described by quantum fields remains a major challenge. In this study, a general scheme for certifying entanglement is developed and demonstrated by revealing entanglement between distinct subsystems of a spinor Bose-Einstein condensate. The detection of squeezing in Bogoliubov modes in a multimode setting showcases the potential for enhancing the capabilities of quantum simulations in studying entanglement in spatially extended many-body systems.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Jonas Richter, Arijeet Pal
Summary: Disordered quantum systems undergoing a many-body localization (MBL) transition fail to reach thermal equilibrium under their own dynamics. Distinguishing between asymptotically localized or delocalized dynamics based on numerical results is, however, nontrivial due to finite-size effects. In this study, we demonstrate that numerical linked cluster expansions (NLCE) provide a powerful tool to explore MBL by simulating quench dynamics in disordered spin-1/2 two-leg ladders and Fermi-Hubbard chains. The results show that NLCE outperforms direct simulations of finite systems with open or periodic boundaries, especially for intermediate disorder below the putative MBL transition.
Article
Materials Science, Multidisciplinary
Elmer V. H. Doggen, Igor V. Gornyi, Dmitry G. Polyakov
Summary: The application of a linearly increasing potential can inhibit thermalization in many-body systems, but a stronger potential gradient is required in the case of a two-dimensional system. Studies show that delocalization is generally favored for typical states in two-dimensional Stark many-body systems.
Article
Physics, Multidisciplinary
Kamil Korzekwa, Christopher T. Chubb, Marco Tomamichel
PHYSICAL REVIEW LETTERS
(2019)
Article
Physics, Multidisciplinary
Kamil Korzekwa, Stanislaw Czachorski, Zbigniew Puchala, Karol Zyczkowski
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2019)
Article
Physics, Multidisciplinary
Cristina Cirstoiu, Kamil Korzekwa, David Jennings
Article
Physics, Multidisciplinary
Kamil Korzekwa, Matteo Lostaglio
Summary: The study shows that quantum dynamics can simulate classical processes that require memory, with advantages in cost, and that Markovian master equations with quantum controls can access more classical states compared to those with classical controls, potentially leading to advantages in cooling protocols.
Article
Physics, Mathematical
Grzegorz Rajchel-Mieldzioc, Kamil Korzekwa, Zbigniew Puchala, Karol Zyczkowski
Summary: The Birkhoff polytope B-d, consisting of bistochastic matrices of order d, is important for various areas of research. We introduce the set L-d of bracelet matrices to study unistochasticity and prove some properties. We analyze the spectra of unistochastic matrices arising from circulant unitary matrices and fully characterize the set of circulant unistochastic matrices for small dimensions.
JOURNAL OF MATHEMATICAL PHYSICS
(2022)
Article
Computer Science, Information Systems
Kamil Korzekwa, Zbigniew Puchala, Marco Tomamichel, Karol Zyczkowski
Summary: We analyze the problem of encoding classical information into different resources of a quantum state, considering a general class of communication scenarios. For any state, we find upper bounds on the number of messages that can be encoded using the operations, as well as matching lower bounds in the case of a specific resource destroying map. In the asymptotic setting, our bounds provide an operational interpretation of resource monotones.
IEEE TRANSACTIONS ON INFORMATION THEORY
(2022)
Article
Physics, Fluids & Plasmas
A. de Oliveira Junior, Jakub Czartowski, Karol Zyczkowski, Kamil Korzekwa
Summary: The second law of thermodynamics introduces an asymmetry in the flow of events, known as the thermodynamic arrow of time. This leads to an ordering of the system's state space into past, future, and incomparable regions. In this study, we analyze the structure of thermal cones, which represent the states that a given state can evolve to (future thermal cone) or evolve from (past thermal cone) thermodynamically. We provide explicit constructions of the past thermal cone and the incomparable region for a classical system interacting with a heat bath, and analyze their behavior based on thermodynamic monotones.
Article
Physics, Fluids & Plasmas
Tanmoy Biswas, A. de Oliveira Junior, Michal Horodecki, Kamil Korzekwa
Summary: This paper derives a version of the fluctuation-dissipation theorem within a resource-theoretic framework, providing a connection between the response of a system subject to perturbation and the fluctuations associated with observables in equilibrium. The results enable the optimal performance analysis of thermodynamic protocols for quantum states with coherence between different energy eigenstates.
Article
Optics
Matteo Lostaglio, Kamil Korzekwa
Summary: This article presents a framework that overcomes the limitations of current dynamical and information theory approaches in quantum thermodynamics. The framework provides a complete set of generalized entropy production inequalities for non-equilibrium transformations, and can be simplified to a verifiable set of constraints. Importantly, the framework is constructive, returning explicit protocols for any allowed transformation.
Article
Quantum Science & Technology
Hakop Pashayan, Oliver Reardon-Smith, Kamil Korzekwa, Stephen D. Bartlett
Summary: Researchers present two classical algorithms for simulating universal quantum circuits, with each algorithm performing best in different parameter regimes. The ESTIMATE algorithm provides an estimate of measurement outcome probabilities with a specific precision, while the COMPUTE algorithm calculates probabilities to machine precision.
Article
Optics
Zbigniew Puchala, Kamil Korzekwa, Roberto Salazar, Pawel Horodecki, Karol Zyczkowski
Summary: This study focuses on a class of dephasing superchannels that affect the coherence properties of quantum channels, showing that their coherence-generating power is monotonic. It also investigates the impact of dephasing noise on the number of distinguishable channels that a quantum channel can be mapped to, considering the role of memory in quantum systems of dimension greater than 2.
Article
Physics, Fluids & Plasmas
Maria Quadeer, Kamil Korzekwa, Marco Tomamichel
Summary: This study examines work extraction processes of two-level systems mediated by finite-time interactions with an ambient bath, known as partial thermalizations, as continuous-time Markov processes. The research reveals fluctuations in the amount of work that can be extracted due to the stochastic nature of the process, and investigates the impact of the rate at which system parameters are driven and the rate of thermalization with the bath. Analytic expressions for average work and a lower bound for the variance of work are derived, demonstrating that such processes generally cannot be fluctuation-free. Furthermore, the study shows that an upper bound for the Monte Carlo estimate of the variance of work can be obtained using Jarzynski's fluctuation-dissipation relation and analyzes work extraction cycles under different constraints by modifying the Carnot cycle.
Article
Optics
Christopher T. Chubb, Marco Tomamichel, Kamil Korzekwa
Article
Quantum Science & Technology
Christopher T. Chubb, Marco Tomamichel, Kamil Korzekwa
