Effective protection of quantum coherence by non-Hermitian driving

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.

arXiv comment6 pages, 3 figures

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• Probing phase transitions in non-Hermitian systems with Multiple Quantum Coherences
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• Cohering and decohering power of massive scalar fields under instantaneous interactions
• Coexistence of directed momentum current and ballistic energy diffusion in coupled non-Hermitian kicked rotors
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