Coherence dynamics in quantum many-body systems with conservation laws

• URL: http://arxiv.org/abs/2604.23192v1
• Date: Sat, 25 Apr 2026 07:52:18 GMT
• Title: Coherence dynamics in quantum many-body systems with conservation laws
• Abstract summary: We study how conservation laws shape the spreading of quantum coherence in many-body dynamics.<n>We probe coherences both globally, via the participation entropy, and locally, via the relative entropy of coherence.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We study how conservation laws shape the spreading of quantum coherence in many-body dynamics. Focusing on $U(1)$-symmetric random circuits, charge-and-dipole conserving circuits, as well as ergodic Hamiltonian dynamics, we probe coherences both globally, via the participation entropy, and locally, via the relative entropy of coherence. Combining exact vector evolution, matrix product state simulations, and replica tensor networks methods, we find that conservation laws replace the logarithmic saturation of unconstrained circuits with slow hydrodynamic relaxation of the global coherence measures. Locally, symmetry-constrained circuits show a clean rise-peak-fall structure whose peak time grows algebraically with subsystem size. In contrast, ergodic Hamiltonians broaden the peak into an extended plateau at larger subsystems, highlighting a qualitatively distinct mechanism. Coherence thus emerges as a sensitive probe of symmetry-constrained thermalization, linking quantum resource dynamics to many-body transport.

Related papers

• Observation of far-from-equilibrium scaling in the transient dynamics of 2D quantum magnets [0.004370410088640301]
  We investigate the quench dynamics of the transverse-field Ising model using programmable Rydberg-atom arrays.<n>A mean-field description effectively reproduces the magnetization oscillations.<n>Results reveal a robust scaling regime governing the transient dynamics of short-range interacting two-dimensional quantum magnets.
  arXiv  Detail & Related papers  (2026-08-07T13:26:13Z)
• Hydrodynamic tails in chaotic spin chains with quantum group symmetry [36.94429692322632]
  We show that quantum group symmetry provides a novel mechanism for anomalous hydrodynamics in chaotic systems.<n>We study the dynamics of local operators carrying $U(1)$ charge in non-integrable lattice models that also have quantum group symmetry.
  arXiv  Detail & Related papers  (2026-06-18T18:34:52Z)
• Generalized symmetries, invariant solutions and conservation laws in the Jaynes-Cummings model [41.99844472131922]
  We investigate the Jaynes--Cummings model (JCM) using Lie symmetry analysis and conservation-law theory.<n>The dynamics is formulated as a system of partial differential equations by projecting the von Neumann equation onto the atomic degrees of freedom.<n>We derive additional conserved currents involving atomic populations, coherence, reduced-state purity, and moments of the field characteristic function.
  arXiv  Detail & Related papers  (2026-06-14T01:42:11Z)
• Continuum field theory of matchgate tensor network ensembles [36.94429692322632]
  We develop a continuum description for random ensembles of two-dimensional fermionic matchgate tensor networks.<n>As a diagnostic of the resulting universal physics, we analyze disorder-averaged moments of fermionic two-point functions.<n>We show that disorder drives universal long-distance behavior governed by a nonlinear sigma-model of symmetry class D with a topological term.
  arXiv  Detail & Related papers  (2026-03-06T12:15:35Z)
• Emergent Universality Class in Dissipative Quantum Systems with Dipole Moment Conservation [25.02042066713773]
  We investigate the universal dynamics of dissipative quantum systems with dipole moment conservation.<n>Our analysis unveils a novel strongly interacting non-equilibrium fixed point that governs the equal-time phase fluctuations.<n>Our results reveal the intricate interplay between kinetic constraints and dissipation in quantum many-body systems.
  arXiv  Detail & Related papers  (2025-12-19T03:44:26Z)
• Realization of Trapped Ion Dynamics in the Strong-Field Regime and Non-Markovianity [33.781064984238775]
  We experimentally investigate the dynamics of a trapped ion where the Rabi frequency (Omega) approaches the vibrational mode frequency (nu)<n>Using quantum state tomography, we reconstruct the density matrix and track its evolution to assess non-Markovianity.<n>Our findings establish a pathway for using trapped-ion platforms to investigate non-Markovianity, coherent control, and the fundamental behavior of open quantum systems in extreme regimes.
  arXiv  Detail & Related papers  (2025-10-23T11:25:09Z)
• Probing emergent prethermal dynamics and resonant melting on a programmable quantum simulator [28.28351393962583]
  dynamics of isolated quantum systems following a sudden quench plays a central role in many areas of material science, high-energy physics, and quantum chemistry.<n>Here, we use a programmable neutral atom quantum simulator to explore quench dynamics in spin models with up to 180 qubits.<n>We trace their robustness to Floquet-like prethermal steady states that are stabilized over long emergent timescales.
  arXiv  Detail & Related papers  (2025-10-13T17:58:04Z)
• Controlling the dynamics of atomic correlations via the coupling to a dissipative cavity [0.0]
  We analyze the relaxation dynamics in an open system composed by a quantum gas of bosons in a lattice interacting via both contact and global interactions.<n>We report the onset of periodic oscillations of the atomic coherences exhibiting hallmarks of synchronization after a quantum quench.
  arXiv  Detail & Related papers  (2024-03-29T10:18:21Z)
• Signatures of a quantum stabilized fluctuating phase and critical dynamics in a kinetically-constrained open many-body system with two absorbing states [0.0]
  We introduce and investigate an open many-body quantum system in which kinetically coherent and dissipative processes compete. Our work shows how the interplay between coherent and dissipative processes as well as constraints may lead to a highly intricate non-equilibrium evolution.
  arXiv  Detail & Related papers  (2022-04-22T07:51:38Z)
• Relaxation to a Parity-Time Symmetric Generalized Gibbs Ensemble after a Quantum Quench in a Driven-Dissipative Kitaev Chain [0.0]
  We show that relaxation of driven-dissipative systems after a quantum quench can be determined by a maximum entropy ensemble. We show that these results apply to broad classes of noninteracting fermionic models.
  arXiv  Detail & Related papers  (2022-03-28T08:59:58Z)
• Decimation technique for open quantum systems: a case study with driven-dissipative bosonic chains [62.997667081978825]
  Unavoidable coupling of quantum systems to external degrees of freedom leads to dissipative (non-unitary) dynamics. We introduce a method to deal with these systems based on the calculation of (dissipative) lattice Green's function. We illustrate the power of this method with several examples of driven-dissipative bosonic chains of increasing complexity.
  arXiv  Detail & Related papers  (2022-02-15T19:00:09Z)
• Symmetry-resolved dynamical purification in synthetic quantum matter [1.2189422792863447]
  We show that symmetry-resolved information spreading is inhibited due to the competition of coherent and incoherent dynamics. Our work shows that symmetry plays a key role as a magnifying glass to characterize many-body dynamics in open quantum systems.
  arXiv  Detail & Related papers  (2021-01-19T19:01:09Z)
• Controlling many-body dynamics with driven quantum scars in Rydberg atom arrays [41.74498230885008]
  We experimentally investigate non-equilibrium dynamics following rapid quenches in a many-body system composed of 3 to 200 strongly interacting qubits in one and two spatial dimensions. We discover that scar revivals can be stabilized by periodic driving, which generates a robust subharmonic response akin to discrete time-crystalline order.
  arXiv  Detail & Related papers  (2020-12-22T19:00:02Z)

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.