光子学报 ›› 2020, Vol. 49 ›› Issue (10): 1027002-1027002.doi: 10.3788/gzxb20204910.1027002

• 量子光学 • 上一篇    下一篇

幅值阻尼环境中两体纠缠对量子比特基的依赖性

汪新文1,2(), 张慧敏1, 刘珂1, 刘延1   

  1. 1.衡阳师范学院 物理与电子工程学院,湖南 衡阳 421002
    2.衡阳师范学院 智能信息处理与应用湖南省重点实验室,湖南 衡阳 421002
  • 收稿日期:2020-05-29 接受日期:2020-08-16 出版日期:2020-10-25 发布日期:2020-10-13
  • 作者简介:汪新文(1980—),男,教授,博士,主要研究方向为量子光学与量子信息. Email: xwwang@hynu.edu.cn
  • 基金资助:
    国家自然科学基金(11847010);湖南省自然科学基金(2020JJ4002)

Dependence of Bipartite Entanglement on Qubit-basis in the Amplitude-damping Environment

Xin-wen WANG1,2(), Hui-min ZHANG1, Ke LIU1, Yan LIU1   

  1. 1.College of Physics and Electronic Engineering,Hengyang Normal University,Hengyang,Hunan 421002,China
    2.Hunan Provincial Key Laboratory of Intelligent Information Processing and Application,Hengyang,Hunan 421002,China
  • Received:2020-05-29 Accepted:2020-08-16 Online:2020-10-25 Published:2020-10-13
  • Supported by:
    National Natural Science Foundation of China(11847010);Hunan Provincial Natural Science Foundation of China(2020JJ4002)

摘要:

为了提高纠缠态的内禀鲁棒性,并延长纠缠消退时间,探讨了幅值阻尼环境中量子比特基对两体纠缠鲁棒性的影响.展示了各种量子比特基下纠缠的退化特征和寿命,并给出各种情况下的最佳量子比特基.当纠缠态处于最佳量子比特基时,其纠缠退化的速率最慢,且不会在有限的时间内消失.结果表明可适时通过旋转量子比特基的方法来增强纠缠态的稳健性,将有助于提高基于纠缠的量子协议的实施质量或效率.

关键词: 量子光学, 量子比特基, 两体纠缠, 幅值阻尼, 鲁棒性

Abstract:

In order to enhance the intrinsic robustness or prolong the disentangling time of entangled states, the influence of qubi-basis on the robustness of two-qubit entanglement under local amplitude-damping environments is discussed. The decay law and lifetime of entanglement under various qubit-bases are displayed. The optimal qubit-bases in variety of cases are found. When an entangled state is prepared in an optimal qubit-basis, the entanglement decays most slowly and won't disappear in a finite time. The results imply that one could improve the robustness of entangled states by rotating the bases of qubits, which are expected to be helpful for increasing the qualities or efficiencies of entanglement-based quantum protocols.

Key words: Quantum optics, Qubit-basis, Bipartite entanglement, Amplitude-damping, Robustness

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