Dynamics of quantum discord in the purification process

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• 作者：Wei Song^a ; ^{wsong1@mail.ustc.edu.cn} ; Lin Chen^b ; ^c ; Ming Yang^d ; Zhuo-Liang Cao^a
• 关键词：Quantum discord ; Dynamics process ; Purification
• 刊名：Physica A
• 出版年：2012
• 期刊代码：138_03784371
• 类别：et
• 出版时间：15 August, 2012
• 卷：391
• 期：16
• 页码：4186-4190
• 文件大小：211 K

摘要

We investigate the dynamics of quantum discord during the purification process. In the case of Werner states, it is shown that quantum discord is increased after a round of purification protocol. Furthermore, quantum mutual information and classical correlation is also increased during this process. We also give an analytic expression for a class of higher dimensional states which have additive quantum discord.