Informational Mpemba Effect for Fast State Purification in Non-Hermitian System
Abstract
Quantum systems are inherently fragile to environmental fluctuations or decoherence, limiting their advantages in applications of quantum information and quantum computation. State purification offers a route to recover the purity of system under noisy conditions. Here, we demonstrate a rapid purification of initially mixed states by harnessing collective reservoir engineering in driven non-Hermitian qubit systems, together with multipartite entanglement generation in larger systems. We show that the onset of efficient purification-assisted entanglement generation is dictated by the degeneracy of collective subradiant modes, rather than by exceptional points. Moreover, the system dynamics manifests an informational Mpemba effect, i.e., a more mixed initial state reaches its steady state with unit purity at a faster rate, resembling the conventional Mpemba effect where a hotter system cools more rapidly. These results reveal a unique advantage of driven non-Hermitian quantum systems with engineered collective dissipation, enabling enhanced purification efficiency and offering new opportunities for quantum engineering.
Keywords
Cite
@article{arxiv.2604.07926,
title = {Informational Mpemba Effect for Fast State Purification in Non-Hermitian System},
author = {C. G. Feyisa and Huan-Yu Ku and J. -S. You and H. H. Jen},
journal= {arXiv preprint arXiv:2604.07926},
year = {2026}
}