Global quantum discord and quantum phase transition in XY model

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• 作者：Si-Yuan Liu^a ; ^b ; Yu-Ran Zhang^b ; ^{yrzhang@iphy.ac.cn" class="auth_mail" title="E-mail the corresponding author} ; Wen-Li Yang^a ; ^{wlyang@nwu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Heng Fan^b ; ^c ; ^a ; ^{hfan@iphy.ac.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Global quantum discord ; Quantum phase transition ; XY model
• 刊名：Annals of Physics
• 出版年：2015
• 出版时间：November 2015
• 年：2015
• 卷：362
• 期：Complete
• 页码：805-813
• 全文大小：641 K

文摘

We study the relationship between the behavior of global quantum correlations and quantum phase transitions in XY model. We find that the two kinds of phase transitions in the studied model can be characterized by the features of global quantum discord (GQD) and the corresponding quantum correlations. We demonstrate that the maximum of the sum of all the nearest neighbor bipartite GQDs is effective and accurate for signaling the Ising quantum phase transition, in contrast, the sudden change of GQD is very suitable for characterizing another phase transition in the XY model. This may shed lights on the study of properties of quantum correlations in different quantum phases.