Dissipation-Stabilized Quantum Revivals in a Non-Hermitian Lattice Gauge Theory

• URL: http://arxiv.org/abs/2512.24418v1
• Date: Tue, 30 Dec 2025 19:00:00 GMT
• Title: Dissipation-Stabilized Quantum Revivals in a Non-Hermitian Lattice Gauge Theory
• Authors: Yevgeny Bar Lev, Jad C. Halimeh, Achilleas Lazarides,
• Abstract summary: We introduce a non-Hermitian version in which the spin-flip rate differs between the two spin directions.<n>We find that when the facilitating direction of the spin is disfavored, the oscillations are instead emphenhanced, decaying much slower than in the PXP limit.<n>Our work provides an analytically tractable and conceptually simple example where non-Hermiticity enhances the stability of dynamically non-trivial coherent many-body modes.
• Score: 0.0032818514814266144
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: With the advent of quantum simulation experiments of lattice gauge theories (LGTs), an open question is the effect of non-Hermiticity on their rich physics. The well-known PXP model, a U$(1)$ LGT with a two-level electric field in one spatial dimension, has become a paradigm of exotic physics in and out of equilibrium. Here, we introduce a non-Hermitian version in which the spin-flip rate differs between the two spin directions. While the naive expectation is that non-Hermiticity might suppress coherent phenomena such as quantum many-body scars, we find that when the facilitating direction of the spin is disfavored, the oscillations are instead \emph{enhanced}, decaying much slower than in the PXP limit. We demonstrate that this can be understood through a similarity transformation that maps our model to the standard PXP model, revealing that the oscillations are enhanced versions of the PXP scars. Our work provides an analytically tractable and conceptually simple example where non-Hermiticity enhances the stability of dynamically non-trivial coherent many-body modes.

Related papers

• Evidence for a two-dimensional quantum glass state at high temperatures [108.88989889650607]
  Disorder in quantum many-body systems can drive transitions between ergodic and non-ergodic phases.<n>We study an interacting spin model at finite temperature in a disordered landscape.<n>Our results show that there is a transition out of the ergodic phase in two-dimensional systems.
  arXiv  Detail & Related papers  (2026-01-04T00:09:50Z)
• Wave-packet dynamics in pseudo-Hermitian lattices: Coexistence of Hermitian and non-Hermitian wavefronts [1.4323566945483497]
  We show that this dual-front behavior arises naturally in systems governed by a pseudo-Hermitian Hamiltonian.<n>Using the paradigmatic Hatano-Nelson model as our primary example, we demonstrate that this coexistence is essential for understanding a wide array of unconventional dynamical effects.
  arXiv  Detail & Related papers  (2025-12-17T11:27:39Z)
• Realizing Parrondo's Paradox in Single-Qubit Quantum Walks via Local Phase-Induced Spatial Inhomogeneity [3.68903005518413]
  Parrondo's paradox describes a counterintuitive phenomenon where alternating between two individually losing games results in a winning expectation.<n>We show that a genuine quantum Parrondo effect can emerge in discrete-time quantum walks (DTQWs) by alternating two SU(2) coin operators.<n>We analyze the role of phase angle, coin parameters, and game sequences, and identify optimal regions in which constructive interference enables paradoxical transport.
  arXiv  Detail & Related papers  (2025-08-13T03:27:42Z)
• Real-time dynamics of false vacuum decay [49.1574468325115]
  We investigate false vacuum decay of a relativistic scalar field in the metastable minimum of an asymmetric double-well potential. We employ the non-perturbative framework of the two-particle irreducible (2PI) quantum effective action at next-to-leading order in a large-N expansion.
  arXiv  Detail & Related papers  (2023-10-06T12:44:48Z)
• $\mathcal{PT}$-Symmetry breaking in quantum spin chains with exceptional non-Hermiticities [0.0]
  We present a new set of models with non-Hermiticity generated by splitting a Hermitian term into two Jordan-normal form parts. We find a robust PT threshold that seems insensitive to the size of the quantum spin chain.
  arXiv  Detail & Related papers  (2023-04-20T03:03:58Z)
• Measurement phase transitions in the no-click limit as quantum phase transitions of a non-hermitean vacuum [77.34726150561087]
  We study phase transitions occurring in the stationary state of the dynamics of integrable many-body non-Hermitian Hamiltonians. We observe that the entanglement phase transitions occurring in the stationary state have the same nature as that occurring in the vacuum of the non-hermitian Hamiltonian.
  arXiv  Detail & Related papers  (2023-01-18T09:26:02Z)
• Quantum emulation of the transient dynamics in the multistate Landau-Zener model [50.591267188664666]
  We study the transient dynamics in the multistate Landau-Zener model as a function of the Landau-Zener velocity. Our experiments pave the way for more complex simulations with qubits coupled to an engineered bosonic mode spectrum.
  arXiv  Detail & Related papers  (2022-11-26T15:04:11Z)
• Continuous phase transition induced by non-Hermiticity in the quantum contact process model [44.58985907089892]
  How the property of quantum many-body system especially the phase transition will be affected by the non-hermiticity remains unclear. We show that there is a continuous phase transition induced by the non-hermiticity in QCP. We observe that the order parameter and susceptibility display infinitely even for finite size system, since non-hermiticity endows universality many-body system with different singular behaviour from classical phase transition.
  arXiv  Detail & Related papers  (2022-09-22T01:11:28Z)
• Fractional Quantum Zeno Effect Emerging from Non-Hermitian Physics [12.706932285002544]
  We predict quantum non-Hermitian phenomena: the fractional quantum Zeno (FQZ) effect and FQZ-induced photon antibunching. We find FQZ-induced strong photon antibunching in the steady state of a driven emitter even for weak nonlinearities. Remarkably, we identify that the sub-Poissonian quantum statistics of photons, which has no classical analogs, stems here from the key role of non-Hermiticity.
  arXiv  Detail & Related papers  (2022-07-07T17:41:24Z)
• Constraint-induced breaking and restoration of ergodicity in spin-1 PXP models [0.0]
  We show that miscellaneous type of ergodicity can be realized by adjusting the hardcore constraints. We analyze different forms of ergodicity and study their impact on the non-equilibrium dynamics of a Z2 initial state.
  arXiv  Detail & Related papers  (2021-04-01T18:10:43Z)
• Non-equilibrium stationary states of quantum non-Hermitian lattice models [68.8204255655161]
  We show how generic non-Hermitian tight-binding lattice models can be realized in an unconditional, quantum-mechanically consistent manner. We focus on the quantum steady states of such models for both fermionic and bosonic systems.
  arXiv  Detail & Related papers  (2021-03-02T18:56:44Z)
• 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.