Quantum Discord in any Mixture of Two Bi-Qubit Arbitrary Product States

Quantum discord in any mixture of two bi-qubit arbitrary product states is studied with two different approaches. In the first approach the maximM classicM correlations are obtained via numerical computations, while in the second approach they are analytically derived. Quantum correlations captured...

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Published in理论物理通讯：英文版 Vol. 60; no. 12; pp. 667 - 672
Main Author 王胜房 刘益民 李国锋 刘先松 张战军
Format Journal Article
LanguageEnglish
Published 2013
Subjects
产品
和谐
对称性
数值计算
混合物
解析
量子关联
量子比特
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ISSN0253-6102

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Summary:Quantum discord in any mixture of two bi-qubit arbitrary product states is studied with two different approaches. In the first approach the maximM classicM correlations are obtained via numerical computations, while in the second approach they are analytically derived. Quantum correlations captured with both approaches completely coincide, as is in accord with the conclusion of Cen et al. [Phys. Rev. A 83 （2011） 054101]. The symmetry reduction of the concerned states concerning quantum correlations is accomplished. The captured discords are amply analyzed so that some inherent distinct properties are revealed.
Bibliography:Quantum discord in any mixture of two bi-qubit arbitrary product states is studied with two different approaches. In the first approach the maximM classicM correlations are obtained via numerical computations, while in the second approach they are analytically derived. Quantum correlations captured with both approaches completely coincide, as is in accord with the conclusion of Cen et al. [Phys. Rev. A 83 （2011） 054101]. The symmetry reduction of the concerned states concerning quantum correlations is accomplished. The captured discords are amply analyzed so that some inherent distinct properties are revealed.
11-2592/O3
quantum discord, numerical computation approach, analytic expression, any mixture, two bi-qubit arbitrary product states
WANG Sheng-Fang LIU Yi-Min LI Guo-Feng LIU Xian-Song and ZHANG Zhan-Jun （1.Engineering Technology Research Center of Magnetic Materials, Anhui Province, School of Physics ＆ Materials Science Anhui University, Hefei 230039, China 2Department of Physics, Shaoguan University, Shaoguan 512005, China）
ISSN:0253-6102