A note on one-way quantum deficit and quantum discord

作者：Ye, Biao-Liang^*; Fei, Shao-Ming

来源：Quantum Information Processing, 2016, 15(1): 279-289.

DOI：10.1007/s11128-015-1180-0

• One-way quantum deficit
• Quantum discord
• Entanglement of formation

One-way quantum deficit and quantum discord are two important measures of quantum correlations. We revisit the relationship between them in two-qubit systems. We investigate the conditions that both one-way quantum deficit and quantum discord have the same optimal measurement ensembles, and demonstrate that one-way quantum deficit can be derived from the quantum discord for a class of X states. Moreover, we give an explicit relation between one-way quantum deficit and entanglement of formation. We show that under phase damping channel both one-way quantum deficit and quantum discord evolve exactly in the same way for four parameter X states. Some examples are presented in details.

• 出版日期2016-1
• 单位首都师范大学