Entanglement dynamics of two non-Hermitian qubits

IF 1.5 4区物理与天体物理 Q3 OPTICS

Journal of Physics B: Atomic, Molecular and Optical Physics Pub Date : 2024-03-26 DOI:10.1088/1361-6455/ad34a0

Yi-Xi Zhang, Zhen-Tao Zhang, Xiao-Zhi Wei, Bao-Long Liang, Feng Mei, Zhen-Shan Yang

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Abstract

The evolution of entanglement in a non-Hermitian quantum system may behave differently compared to its Hermitian counterpart. In this paper, we investigate the entanglement dynamics of two coupled and driven non-Hermitian qubits. Through calculating the concurrence of the system, we find that the evolution of the bipartite entanglement manifests two distinct patterns in the parameter space. In the low non-Hermiticity regime, the concurrence oscillates significantly, while in the opposite regime the same quantity would trend to a stable value. We attribute this phenomenon to parity-time (

) symmetry phase transition. We also study the effect of decoherence on the entanglement dynamics. Our work provides a method to stabilize entanglement by exploiting non-Hermiticity.

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两个非赫米提质子的纠缠动力学

与赫米特量子系统相比，非赫米特量子系统中纠缠的演化可能表现不同。在本文中，我们研究了两个耦合和驱动的非赫米提量子比特的纠缠动力学。通过计算系统的并发性，我们发现双向纠缠的演化在参数空间中表现出两种截然不同的模式。在低非ermiticity 体系中，并发量会出现明显的振荡，而在相反的体系中，相同的量会趋于稳定值。我们将这一现象归因于奇偶性-时间（PT）对称相变。我们还研究了退相干对纠缠动态的影响。我们的工作提供了一种利用非恒定性稳定纠缠的方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Physics B: Atomic, Molecular and Optical Physics 物理-光学

CiteScore

3.60

自引率

6.20%

发文量

182

审稿时长

2.8 months

期刊介绍： Published twice-monthly (24 issues per year), Journal of Physics B: Atomic, Molecular and Optical Physics covers the study of atoms, ions, molecules and clusters, and their structure and interactions with particles, photons or fields. The journal also publishes articles dealing with those aspects of spectroscopy, quantum optics and non-linear optics, laser physics, astrophysics, plasma physics, chemical physics, optical cooling and trapping and other investigations where the objects of study are the elementary atomic, ionic or molecular properties of processes.