Comparison of quantum discord and relative entropy in some bipartite quantum systems

被引：0
作者：
M. Mahdian
M. B. Arjmandi
机构：
[1] University of Tabriz,Faculty of Physics, Theoretical and Astrophysics Department
来源：
Quantum Information Processing | 2016年 / 15卷
关键词：
Quantum discord; Relative entropy; Orthogonal projection measurements;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
The study of quantum correlations in high-dimensional bipartite systems is crucial for the development of quantum computing. We propose relative entropy as a distance measure of correlations may be measured by means of the distance from the quantum state to the closest classical–classical state. In particular, we establish relations between relative entropy and quantum discord quantifiers obtained by means of orthogonal projection measurements. We show that for symmetrical X-states density matrices the quantum discord is equal to relative entropy. At the end of paper, various examples of X-states such as two-qubit and qubit–qutrit have been demonstrated.
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页码：1569 / 1583
页数：14
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