J4 ›› 2011, Vol. 28 ›› Issue (4): 446-450.

• 量子光学 • 上一篇    下一篇

一类X-态量子关联的几何测量

桂卫军1, 江民斌2   

  1. 1 南昌工程学院理学系,江西 南昌 330099 2 南昌工程学院计算机科学与技术系,江西 南昌 330099
  • 收稿日期:2011-01-10 修回日期:2011-03-02 出版日期:2011-07-28 发布日期:2011-07-06
  • 通讯作者: 桂卫军(1972-), 硕士,副教授,主要从事量子光学以及量子信息相关领域的研究。 E-mail:gwj@mail.ustc.edu.cn

Geometric measurement of quantum correlation for a kind of X-state

GUI Weijun1,JIANG Minbin2   

  1. 1 Department of Science, Nanchang Institute of Technology, Nanchang 330099, China; 2 Department of Computational Science and Technology, Nanchang Institute of Technology, Nanchang 330099, China
  • Received:2011-01-10 Revised:2011-03-02 Published:2011-07-28 Online:2011-07-06

摘要:

量子不谐和(quantum discord,简称QD)常被用来描述量子体系的量子关联。基于Dakic等人提出的QD几何测量方法[1],我们求解了只含一个变量参数X-态的量子关联,并给出在三种不同量子通道中该体系量子关联的具体形式。最后通过针对减振幅通道中对该X-态的纠缠度以及量子关联的抗消相干能力比较,我们用图示的方法显示出量子关联具有比纠缠更强的抗消相干能力。

关键词: 量子光学, X-态, 量子关联, 几何测量

Abstract:

Quantum discord(QD) can be used to characterize quantum correlation of a quantum system. Based on geometric measure of QD(GMQD) quantum correlation of the single-parameter X- state was calculated,and the results for the case were also given under three different quantum channels. For the amplitude-damping channel, by comparing concurrence and GMQD of the X-state mentioned above through using graphical method, its concluded that GMQD exhibit more robust than concurrence when the quantum system is exposed to environment.

Key words: quantum optics, X-state, quantum correlation, geometric measurement

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