Dynamically frozen long-distance entanglement via non-Hermitian PT-symmetric systems
- URL: http://arxiv.org/abs/2606.14177v1
- Date: Fri, 12 Jun 2026 06:59:51 GMT
- Title: Dynamically frozen long-distance entanglement via non-Hermitian PT-symmetric systems
- Abstract summary: In distributed quantum networks, interacting spin systems can mediate the generation of highly entangled links.<n>We investigate the role of effective parity-time (PT)-symmetric non-Hermitian spin-1/2 bulks weakly coupled to two quantum links.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: In distributed quantum networks, interacting spin systems can mediate the generation of highly entangled links between distant nodes. We investigate the role of effective parity-time (PT)-symmetric non-Hermitian spin-1/2 bulks weakly coupled to two quantum links, obtained due to the environmental interactions affecting both the bulk and the links. Focusing on effective non-Hermitian nearest-neighbor (NN) Su-Schrieffer-Heeger (SSH) models, we analyze how non-Hermiticity influences the dynamical formation of long-distance entanglement (LDE). For a paradigmatic model consisting of a quantum XX bulk subjected to imaginary staggered magnetic fields, we analytically determine the exceptional points arising from the resulting bulk-mediated interactions between the links. Combining analytical and numerical methods, we demonstrate that an initially fully separable state can dynamically evolve into highly entangled link states near these exceptional points in the broken regime. Further, after optimizing over time and system parameters, near-unit time-averaged entanglement between the links emerges under weak imaginary magnetic fields and bulk-link couplings, which cannot be attained in the corresponding Hermitian systems. Moreover, the non-Hermitian dynamics exhibit a freezing of high entanglement in the vicinity of exceptional points, a feature absent in Hermitian counterparts. We also identify regimes of long-range interaction strengths that yield a higher time-averaged entanglement than the corresponding NN models. Furthermore, we establish that LDE persists in the stationary regime, highlighting the promise of engineered non-Hermitian dynamics for realizing robust and frozen entangled links in quantum networks.
Related papers
- Breakdown of Thermalization from Real-Time Dynamics in the Two-Dimensional Hubbard Model [37.56003520528009]
Thermalization in strongly correlated fermionic systems remains a central open problem in quantum many-body physics.<n>In this work, we investigate the real-time dynamics and the approach to thermalization in the two-dimensional Hubbard model.
arXiv Detail & Related papers (2026-06-03T18:00:05Z) - Quantum-enhanced sensing from the interplay of long-range interactions and non-Hermiticity [0.0]
Long-range (LR) quantum spin systems offer promising advantages for quantum information processing and sensing.<n>Here, we investigate parameter estimation in a long-range XX spin model coupled to a reservoir.<n>We show that, with suitable tuning of the system parameters, both the time and system-size scaling of the QFI are enhanced in the LR regime.
arXiv Detail & Related papers (2026-05-03T14:47:37Z) - From Quantum Chaos to a Reversed Quantum Disentangled Liquid in a Disorder-Free Spin Ladder [0.0]
We investigate a spin-1/2 ladder with asymmetric XY leg couplings and tunable Ising interactions on the rungs.<n>We identify the microscopic origin of many-body localization (MBL) in this setting.<n>We show the emergence of a reversed quantum disentangled liquid (reversed-QDL), where the light species thermalizes while the heavy species remains localized.
arXiv Detail & Related papers (2026-02-23T08:20:36Z) - Quantum Mpemba effect in a four-site Bose-Hubbard model [0.8619139771027764]
We investigate the quantum Mpemba effect (QME) in a one-dimensional Bose-Hubbard model across clean and disordered regimes.<n>Our results reveal that QME emerges prominently in the clean-interacting regime, where many-body correlations drive nonlinear relaxation pathways.
arXiv Detail & Related papers (2025-09-08T17:48:42Z) - Exponential onset of scalable entanglement via twist-and-turn dynamics in XY models [41.94295877935867]
We show that the so-called twist-and-turn" (TaT) dynamics can offer an important resource to reach scalable multipartite entanglement.<n>For dipolar interactions, the entanglement dynamics at intermediate times is completely at odds with thermalization.
arXiv Detail & Related papers (2025-07-10T22:34:44Z) - Fine-grained dynamics of entanglement in non-integrable quenches far across the Ising quantum critical point [0.0]
This work focuses on the paradigmatic Ising spin chain with transverse and longitudinal fields.<n>We present numerical observations of several $textitfine-grained$ features of far-from-equilibrium dynamics.<n>These features are expected to hold for quench dynamics across Ising quantum critical points in more complicated systems.
arXiv Detail & Related papers (2025-04-21T16:19:17Z) - Theory of the correlated quantum Zeno effect in a monitored qubit dimer [41.94295877935867]
We show how the competition between two measurement processes give rise to two distinct Quantum Zeno (QZ) regimes.<n>We develop a theory based on a Gutzwiller ansatz for the wavefunction that is able to capture the structure of the Hilbert phase diagram.<n>We show how the two QZ regimes are intimately connected to the topology of the flow of the underlying non-Hermitian Hamiltonian governing the no-click evolution.
arXiv Detail & Related papers (2025-03-28T19:44:48Z) - Quantum-classical correspondence of non-Hermitian spin-orbit coupled bosonic junction [4.934387267206206]
We show that near the symmetry-breaking phase transition point, the correspondence between classical (mean-field) and quantum dynamics is more likely to break down.
In both the mean-field and many-particle models, the SOC effects can greatly promote the synchronous periodic oscillations between the spin-up and spin-down components.
arXiv Detail & Related papers (2024-10-17T02:58:17Z) - Exceptional point and hysteresis trajectories in cold Rydberg atomic gases [33.90303571473806]
Long-range interactions induce an additional dissipation channel, resulting in non-Hermitian many-body dynamics.
Here, we report experimental observation of interaction-induced exceptional points in cold Rydberg atomic gases.
arXiv Detail & Related papers (2024-08-06T11:35:06Z) - Slow semiclassical dynamics of a two-dimensional Hubbard model in
disorder-free potentials [77.34726150561087]
We show that introduction of harmonic and spin-dependent linear potentials sufficiently validates fTWA for longer times.
In particular, we focus on a finite two-dimensional system and show that at intermediate linear potential strength, the addition of a harmonic potential and spin dependence of the tilt, results in subdiffusive dynamics.
arXiv Detail & Related papers (2022-10-03T16:51:25Z) - Sufficient condition for gapless spin-boson Lindbladians, and its
connection to dissipative time-crystals [64.76138964691705]
We discuss a sufficient condition for gapless excitations in the Lindbladian master equation for collective spin-boson systems.
We argue that gapless modes can lead to persistent dynamics in the spin observables with the possible formation of dissipative time-crystals.
arXiv Detail & Related papers (2022-09-26T18:34:59Z) - Tuning long-range fermion-mediated interactions in cold-atom quantum
simulators [68.8204255655161]
Engineering long-range interactions in cold-atom quantum simulators can lead to exotic quantum many-body behavior.
Here, we propose several tuning knobs, accessible in current experimental platforms, that allow to further control the range and shape of the mediated interactions.
arXiv Detail & Related papers (2022-03-31T13:32:12Z)
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.