›› 2014, Vol. 23 ›› Issue (7): 70305-070305.doi: 10.1088/1674-1056/23/7/070305
王仲宵, 王波波
Wang Zhong-Xiao (王仲宵), Wang Bo-Bo (王波波)
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).
中图分类号: (Quantum information)