Symmetric quantum discord for a two-qubit state

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

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).

Keywords: quantum discord symmetric quantum discord optimization process

Received: 23 October 2013
Revised: 12 January 2014
Accepted manuscript online:

PACS:	03.67.-a	(Quantum information)
	42.50.Dv	(Quantum state engineering and measurements)

Fund: 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).

Corresponding Authors: Wang Zhong-Xiao
E-mail: 11121773@bjtu.edu.cn

About author: 03.67.-a; 42.50.Dv

Cite this article:

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

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