Quantum many-body scars and non-thermal behaviour in Fredkin spin chains
- URL: http://arxiv.org/abs/2403.03986v1
- Date: Wed, 6 Mar 2024 19:00:16 GMT
- Title: Quantum many-body scars and non-thermal behaviour in Fredkin spin chains
- Authors: Luke Causer, Mari Carmen Ba\~nuls and Juan P. Garrahan
- Abstract summary: We study the dynamics and thermalization of the Fredkin spin chain.
We consider deformations away from its point in order to tune between regimes where kinetic energy and those where potential energy does.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We study the dynamics and thermalization of the Fredkin spin chain, a system
with local three-body interactions, particle conservation and explicit kinetic
constraints. We consider deformations away from its stochastic point in order
to tune between regimes where kinetic energy dominates and those where
potential energy does. By means of exact diagonalisation, perturbation theory
and variational matrix product states, we show that the stochastic point is
where a transition occurs between a phase of fast thermalization to one of slow
metastable (prethermal) dynamics. This change in relaxation is connected to the
emergence of additional kinetic constraints which lead to the fragmentation of
Hilbert space in the limit of a large potential energy. We also show that this
transition can lead to thermalization being evaded for special initial
conditions due to non-thermal eigenstates (akin to quantum many-body scars). We
provide clear evidence for the existence of these non-thermal states for large
system sizes even when far from the large-potential-energy limit, and explain
their connection to the emergent kinetic constraints.
Related papers
- Fundamental limits on anomalous energy flows in correlated quantum systems [0.0]
In classical thermodynamics energy always flows from the hotter system to the colder one.
If these systems are initially correlated, the energy flow can reverse, making the cold system colder and the hot system hotter.
This intriguing phenomenon is called anomalous energy flow'' and shows the importance of initial correlations in determining physical properties of thermodynamic systems.
arXiv Detail & Related papers (2023-07-07T20:51:48Z) - Noncommuting conserved charges in quantum thermodynamics and beyond [39.781091151259766]
How do noncommuting charges affect thermodynamic phenomena?
Charges' noncommutation has been found to invalidate derivations of the thermal state's form.
Evidence suggests that noncommuting charges may hinder thermalization in some ways while enhancing thermalization in others.
arXiv Detail & Related papers (2023-05-31T18:00:00Z) - Demonstrating Quantum Microscopic Reversibility Using Coherent States of
Light [58.8645797643406]
We propose and experimentally test a quantum generalization of the microscopic reversibility when a quantum system interacts with a heat bath.
We verify that the quantum modification for the principle of microscopic reversibility is critical in the low-temperature limit.
arXiv Detail & Related papers (2022-05-26T00:25:29Z) - Prethermalization in one-dimensional quantum many-body systems with
confinement [0.0]
Unconventional nonequilibrium phases with restricted correlation spreading and slow entanglement growth have been proposed to emerge in systems with confined excitations.
Here, we show that in confined systems the thermalization dynamics after a quantum quench instead exhibits multiple stages with well separated time scales.
The discussed prethermalization dynamics is directly relevant to generic one-dimensional, many-body systems with confined excitations
arXiv Detail & Related papers (2022-02-25T19:01:02Z) - Fast Thermalization from the Eigenstate Thermalization Hypothesis [69.68937033275746]
Eigenstate Thermalization Hypothesis (ETH) has played a major role in understanding thermodynamic phenomena in closed quantum systems.
This paper establishes a rigorous link between ETH and fast thermalization to the global Gibbs state.
Our results explain finite-time thermalization in chaotic open quantum systems.
arXiv Detail & Related papers (2021-12-14T18:48:31Z) - Dephasing-enhanced performance in quasiperiodic thermal machines [0.0]
We study the finite-temperature electric and heat transport of the Fibonacci model in linear response.
We find that the thermal and electric conductivities have multiple peaks as a function of dephasing strength.
We argue that this feature can be utilized to enhance performance of quantum thermal machines.
arXiv Detail & Related papers (2021-12-03T17:33:26Z) - Taking the temperature of a pure quantum state [55.41644538483948]
Temperature is a deceptively simple concept that still raises deep questions at the forefront of quantum physics research.
We propose a scheme to measure the temperature of such pure states through quantum interference.
arXiv Detail & Related papers (2021-03-30T18:18:37Z) - Lieb's Theorem and Maximum Entropy Condensates [0.0]
In a broad class of lattices Floquet heating can actually be an advantageous effect.
We show that the maximum entropy steady states which form upon driving the ground state of the Hubbard model on unbalanced bi-partite lattices possess uniform off-diagonal long-range order.
This creation of a hot' condensate can occur on textitany driven unbalanced lattice and provides an understanding of how heating can, at the macroscopic level, expose and alter the order in a quantum system.
arXiv Detail & Related papers (2021-03-08T11:51:08Z) - Analog cosmological reheating in an ultracold Bose gas [58.720142291102135]
We quantum-simulate the reheating-like dynamics of a generic cosmological single-field model in an ultracold Bose gas.
Expanding spacetime as well as the background oscillating inflaton field are mimicked in the non-relativistic limit.
The proposed experiment has the potential of exploring the evolution up to late times even beyond the weak coupling regime.
arXiv Detail & Related papers (2020-08-05T18:00:26Z) - Probing eigenstate thermalization in quantum simulators via
fluctuation-dissipation relations [77.34726150561087]
The eigenstate thermalization hypothesis (ETH) offers a universal mechanism for the approach to equilibrium of closed quantum many-body systems.
Here, we propose a theory-independent route to probe the full ETH in quantum simulators by observing the emergence of fluctuation-dissipation relations.
Our work presents a theory-independent way to characterize thermalization in quantum simulators and paves the way to quantum simulate condensed matter pump-probe experiments.
arXiv Detail & Related papers (2020-07-20T18:00:02Z)
This list is automatically generated from the titles and abstracts of the papers in this site.
This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.