Symmetric quantum discord for a two-qubit state

doi:10.1088/1674-1056/23/7/070305

›› 2014, Vol. 23 ›› Issue (7): 70305-070305.doi: 10.1088/1674-1056/23/7/070305

Symmetric quantum discord for a two-qubit state

王仲宵, 王波波

Department of Physics, School of Science, Beijing Jiaotong University, Beijing 100044, China

收稿日期:2013-10-23 修回日期:2014-01-12 出版日期:2014-07-15 发布日期:2014-07-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 11174028) and the Fundamental Research Funds for the Central Universities, China (Grant No. 2011JBZ013).

Symmetric quantum discord for a two-qubit state

Wang Zhong-Xiao (王仲宵), Wang Bo-Bo (王波波)

Department of Physics, School of Science, Beijing Jiaotong University, Beijing 100044, China

Received:2013-10-23 Revised:2014-01-12 Online:2014-07-15 Published:2014-07-15
Contact: Wang Zhong-Xiao E-mail:11121773@bjtu.edu.cn
About author:03.67.-a; 42.50.Dv
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 11174028) and the Fundamental Research Funds for the Central Universities, China (Grant No. 2011JBZ013).

摘要/Abstract

摘要： We discuss the symmetric quantum discord (SQD) for an arbitrary two-qubit state consisting of subsystems A and B and give the analysis formula of the symmetric quantum discord for the arbitrary two-qubit state. We also give the optimization process of the symmetric quantum discord for some states and obtain the symmetric quantum discord. We compare the quantum discord (QD) with the symmetric quantum discord, and find that the symmetric quantum discord is greater than the quantum discord. We also find that the symmetric quantum discord can be unequal to the quantum discord when the right quantum discord (measure on subsystem B) is equal to the left quantum discord (measure on subsystem A).

关键词: quantum discord, symmetric quantum discord, optimization process

Abstract: We discuss the symmetric quantum discord (SQD) for an arbitrary two-qubit state consisting of subsystems A and B and give the analysis formula of the symmetric quantum discord for the arbitrary two-qubit state. We also give the optimization process of the symmetric quantum discord for some states and obtain the symmetric quantum discord. We compare the quantum discord (QD) with the symmetric quantum discord, and find that the symmetric quantum discord is greater than the quantum discord. We also find that the symmetric quantum discord can be unequal to the quantum discord when the right quantum discord (measure on subsystem B) is equal to the left quantum discord (measure on subsystem A).

Key words: quantum discord, symmetric quantum discord, optimization process

中图分类号: (Quantum information)

03.67.-a

42.50.Dv (Quantum state engineering and measurements)

王仲宵, 王波波. Symmetric quantum discord for a two-qubit state[J]. , 2014, 23(7): 70305-070305.

Wang Zhong-Xiao (王仲宵), Wang Bo-Bo (王波波). Symmetric quantum discord for a two-qubit state[J]. Chin. Phys. B, 2014, 23(7): 70305-070305.

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Symmetric quantum discord for a two-qubit state

Symmetric quantum discord for a two-qubit state

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