Effective protection of quantum coherence by non-Hermitian driving

TL;DR

This paper demonstrates that non-Hermitian driving can restore quantum coherence and protect entanglement in bipartite quantum systems, revealing a new mechanism for coherence preservation in dissipative quantum environments.

Contribution

It introduces a novel mechanism where non-Hermitian driving restores quantum coherence and influences entanglement dynamics, advancing understanding in quantum control and open quantum systems.

Findings

Quantum coherence is revived by non-Hermitian driving.

Entanglement decays with increasing non-Hermitian strength.

Dominance of the quasieigenstate with maximum imaginary part explains the phenomenon.

Abstract

In this letter, we investigate the effects of non-Hermitian driving on quantum coherence in a bipartite system. The results that the dynamical localization destroyed by the Hermitian interaction revives are an evidence of the restoration of quantum coherence by non-Hermitian driving. Besides, the entanglement between the two subsystems also decays with the boosting of non-hermitian driving strength, which provides another evidence that non-Hermitian driving will protect quantum coherence. The physics behind this phenomenon is the domination of the quasieigenstate with maximum imaginary value of the quasieigenvalue on the dynamics of the non-Hermitian system. Our discovery establishes a restoration mechanism of quantum coherence in interacting and dissipative quantum systems, which is highly relevant to experiments in diverse fields from many-body physics to quantum information.