Entanglement preservation in tripartite quantum systems under dephasing dynamics

IF 1.8 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY
EPL Pub Date : 2024-05-19 DOI:10.1209/0295-5075/ad3eac
Chandrashekar Radhakrishnan, Sovik Roy, Ravikumar Chinnarasu and Md. Manirul Ali
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Abstract

Protecting entanglement from decoherence is a critical aspect of quantum information processsing. For many-body quantum systems evolving under decoherence, estimating multipartite entanglement is challenging. This challenge can be met up by considering a distance-based measure such as relative entropy of entanglement which decisively measures entanglement in both pure as well as mixed states. In this work, we investigate the tripartite entanglement dynamics of pure and mixed states in the presence of a structured dephasing environment at finite temperature. We show that the robustness of the quantum system to decoherence is dependent on the distribution of entanglement and its relation to different configurations of the bath. If the bath is structured individually such that each qubit has its own environment, the system has different dynamics compared to when the bath is common to all the three qubits. From the results we conjecture that there is a connection between the distribution of entanglement among the qubits and the distribution of bath degrees of freedom, and the interplay of these two distributions determines the decay rate of the entanglement dynamics. The sustainability of tripartite entanglement is shown to be enhanced significantly in the presence of reservoir memory.
三方量子系统在去相动态下的纠缠保持
保护纠缠不发生退相干是量子信息处理的一个重要方面。对于在退相干条件下演化的多体量子系统,估算多方纠缠具有挑战性。要应对这一挑战,可以考虑基于距离的测量方法,如纠缠的相对熵,它能决定性地测量纯态和混合态的纠缠。在这项工作中,我们研究了在有限温度下结构化去相环境中纯态和混合态的三方纠缠动态。我们的研究表明,量子系统对退相干的鲁棒性取决于纠缠的分布及其与浴槽不同配置的关系。如果浴槽的结构是单独的,每个量子比特都有自己的环境,那么系统的动态就会与所有三个量子比特共用浴槽时的动态不同。根据这些结果,我们推测纠缠在量子比特之间的分布与浴槽自由度的分布之间存在联系,而这两种分布的相互作用决定了纠缠动力学的衰减率。研究表明,三方纠缠的可持续性在存在贮存器记忆的情况下会显著增强。
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
EPL
EPL 物理-物理:综合
CiteScore
3.30
自引率
5.60%
发文量
332
审稿时长
1.9 months
期刊介绍: General physics – physics of elementary particles and fields – nuclear physics – atomic, molecular and optical physics – classical areas of phenomenology – physics of gases, plasmas and electrical discharges – condensed matter – cross-disciplinary physics and related areas of science and technology. Letters submitted to EPL should contain new results, ideas, concepts, experimental methods, theoretical treatments, including those with application potential and be of broad interest and importance to one or several sections of the physics community. The presentation should satisfy the specialist, yet remain understandable to the researchers in other fields through a suitable, clearly written introduction and conclusion (if appropriate). EPL also publishes Comments on Letters previously published in the Journal.
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