Geometric discord for non-X states

doi:10.1088/1674-1056/23/6/060307

中国物理B ›› 2014, Vol. 23 ›› Issue (6): 60307-060307.doi: 10.1088/1674-1056/23/6/060307

Geometric discord for non-X states

刘辰, 董裕力, 朱士群

School of Physical Science and Technology, Soochow University, Suzhou 215006, China

收稿日期:2013-09-21 修回日期:2013-11-09 出版日期:2014-06-15 发布日期:2014-06-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11074184, 11204197, and 11105095), the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20103201120002), and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)).

Geometric discord for non-X states

Liu Chen (刘辰), Dong Yu-Li (董裕力), Zhu Shi-Qun (朱士群)

School of Physical Science and Technology, Soochow University, Suzhou 215006, China

Received:2013-09-21 Revised:2013-11-09 Online:2014-06-15 Published:2014-06-15
Contact: Dong Yu-Li, Zhu Shi-Qun E-mail:yldong@suda.edu.cn;szhu@suda.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11074184, 11204197, and 11105095), the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20103201120002), and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)).

摘要/Abstract

摘要： The level surfaces of geometric discord for a class of two-qubit non-X states are investigated when the Bloch vectors are in arbitrary directions. The level surfaces of constant geometric discord are formed by three intersecting open tubes along three orthogonal directions. When Bloch vectors increase, the tubes along one or two directions shrink towards the center and may either totally disappear or the open tubes may become closed tubes when the Bloch vectors reach a critical value. In the generalized amplitude damping channel, the evolution of geometric discord shows double sudden changes when the parameter γ increases. In the phase damping channel, the freezing phenomenon of geometric discord also exists.

关键词: geometric discord, non-X states, Bloch vectors, generalized amplitude damping channel, phase damping channel

Abstract: The level surfaces of geometric discord for a class of two-qubit non-X states are investigated when the Bloch vectors are in arbitrary directions. The level surfaces of constant geometric discord are formed by three intersecting open tubes along three orthogonal directions. When Bloch vectors increase, the tubes along one or two directions shrink towards the center and may either totally disappear or the open tubes may become closed tubes when the Bloch vectors reach a critical value. In the generalized amplitude damping channel, the evolution of geometric discord shows double sudden changes when the parameter γ increases. In the phase damping channel, the freezing phenomenon of geometric discord also exists.

Key words: geometric discord, non-X states, Bloch vectors, generalized amplitude damping channel, phase damping channel

中图分类号: (Quantum information)

03.67.-a

75.10.Pq (Spin chain models)

刘辰, 董裕力, 朱士群. Geometric discord for non-X states[J]. 中国物理B, 2014, 23(6): 60307-060307.

Liu Chen (刘辰), Dong Yu-Li (董裕力), Zhu Shi-Qun (朱士群). Geometric discord for non-X states[J]. Chin. Phys. B, 2014, 23(6): 60307-060307.

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Geometric discord for non-X states

Geometric discord for non-X states

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