Dynamics of entangled domain walls in quantum many-body scars and breakdown of their prethermalization

TL;DR

This paper studies the dynamics of topological domain walls in quantum many-body scar states within the PXP model, revealing their stability, entanglement properties, and phase transitions under periodic driving, with implications for quantum information.

Contribution

It introduces the analysis of domain wall dynamics in scar states, highlighting their stability, entanglement features, and phase transitions under high-frequency driving.

Findings

Domain walls exhibit oscillating scar features and stable bipartite entanglement.

High-frequency drive induces a transition from prethermalization to Floquet localization.

Domain walls collide with negligible influence on each other, indicating robustness.

Abstract

Based on the PXP model adapted for Rydberg-blockaded chains, we investigate dynamics of topological domain walls between different quantum many-body scar states of $\mathbb{Z}_2$ symmetry. It is found that, the domain walls not only possess oscillating features of scars but also manifest longstanding bipartite entanglement with exactly unchanged flip-flop phase difference, suggesting their potential as quantum information resource. A periodically driven field is exerted and the high-frequency drive gives rise to a phase transition from prethermalization to Floquet localization. In order to investigate the stability of domain walls acting as information carriers, we further simulate the collision between them and find negligible influence on each other. Subsequently, the quench dynamics with domain walls reveals exotic physics and applicable potentials of nonthermalized scar states.