中国物理B ›› 2016, Vol. 25 ›› Issue (3): 30301-030301.doi: 10.1088/1674-1056/25/3/030301

• GENERAL • 上一篇    下一篇

Geometric global quantum discord of two-qubit states

Yunlong Xiao(肖运龙), Tao Li(李陶), Shao-Ming Fei(费少明), Naihuan Jing(景乃桓), Zhi-Xi Wang(王志玺), Xianqing Li-Jost(李先清)   

  1. 1. School of Mathematical Sciences, South China University of Technology, Guangzhou 510640, China;
    2. Max Planck Institute for Mathematics in the Sciences, 04103 Leipzig, Germany;
    3. School of Mathematical Sciences, Capital Normal University, Beijing 100048, China;
    4. Department of Mathematics, North Carolina State University, Raleigh, NC 27695, USA
  • 收稿日期:2015-08-19 修回日期:2015-11-30 出版日期:2016-03-05 发布日期:2016-03-05
  • 通讯作者: Tao Li E-mail:lt881122@sina.com
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11275131, 11305105, and 11271138) and Simons Foundation (Grant No. 198129).

Geometric global quantum discord of two-qubit states

Yunlong Xiao(肖运龙)1,2, Tao Li(李陶)3, Shao-Ming Fei(费少明)2,3, Naihuan Jing(景乃桓)1,4, Zhi-Xi Wang(王志玺)3, Xianqing Li-Jost(李先清)2   

  1. 1. School of Mathematical Sciences, South China University of Technology, Guangzhou 510640, China;
    2. Max Planck Institute for Mathematics in the Sciences, 04103 Leipzig, Germany;
    3. School of Mathematical Sciences, Capital Normal University, Beijing 100048, China;
    4. Department of Mathematics, North Carolina State University, Raleigh, NC 27695, USA
  • Received:2015-08-19 Revised:2015-11-30 Online:2016-03-05 Published:2016-03-05
  • Contact: Tao Li E-mail:lt881122@sina.com
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11275131, 11305105, and 11271138) and Simons Foundation (Grant No. 198129).

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摘要：

We consider the geometric global quantum discord (GGQD) of two-qubit systems. By analyzing the symmetry of geometric global quantum discord we give an approach for deriving analytical formulae of the extremum problem which lies at the core of computing the GGQD for arbitrary two-qubit states. Furthermore, formulae of GGQD of arbitrary two-qubit states and some concrete examples are presented.

关键词: geometric global quantum discord, two-qubit state

Abstract:

We consider the geometric global quantum discord (GGQD) of two-qubit systems. By analyzing the symmetry of geometric global quantum discord we give an approach for deriving analytical formulae of the extremum problem which lies at the core of computing the GGQD for arbitrary two-qubit states. Furthermore, formulae of GGQD of arbitrary two-qubit states and some concrete examples are presented.

Key words: geometric global quantum discord, two-qubit state

中图分类号:  (Quantum information)

  • 03.67.-a