Symmetry-Protected Fast Relaxation and the Strong Quantum Mpemba Effect
Abstract
Understanding how symmetry constrains dissipative relaxation in open quantum many-body systems remains a central challenge in nonequilibrium physics. Here we uncover a symmetry-selective Liouvillian mechanism that protects an isolated fast-decay channel in a long-range XXZ spin chain subject to dephasing noise. At the -symmetric point, highly symmetric initial states couple exclusively to an exact Liouvillian eigenmode with decay rate , producing universal exponential relaxation independent of system size and interaction range. Breaking the symmetry restores overlap with slow Liouvillian modes and substantially suppresses the relaxation dynamics. This symmetry-filtered mode accessibility naturally gives rise to a strong quantum Mpemba effect, where a state farther from the steady state relaxes anomalously faster than closer thermal states. Our results establish symmetry-protected fast relaxation as a mechanism for controlling nonequilibrium pathways in open quantum systems.
Keywords
Cite
@article{arxiv.2605.20930,
title = {Symmetry-Protected Fast Relaxation and the Strong Quantum Mpemba Effect},
author = {Zijun Wei and Mingdi Xu and Yefeng Song and Yangqian Yan and Lei Pan},
journal= {arXiv preprint arXiv:2605.20930},
year = {2026}
}