Quantum discord and quantum phase transition in the XXZ spin chain with three-site interaction

被引：5
作者：
Yang, Jing
Cong, Mei-Yan
Huang, Yan-Xia [1 ]
机构：
[1] Hubei Normal Univ, Coll Phys & Elect Sci, Huangshi 435002, Hubei, Peoples R China
来源：
MODERN PHYSICS LETTERS B | 2016年 / 30卷 / 34期
基金：
中国国家自然科学基金;
关键词：
Entanglement; quantum discord; quantum phase transition; ENTANGLEMENT;
D O I：
10.1142/S0217984916503930
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Pairwise quantum discord (QD) and entanglement of the three-qubit XXZ Heisenberg spin chain with two types of three-site interactions and an external magnetic field are investigated. Our study found that both entanglement and quantum discord could detect the quantum critical phenomena of this model. We were able to obtain a nonzero value of quantum discord even at high temperature with the increase of XZX+YZY or XZY-YZX three-site interaction, however, the cooperative effect of XZX+YZY and XZY-YZX interactions is more ideal. Furthermore, in contrast to XZY-YZX and XZX+YZY interactions, the cooperative effect of XZX+YZY and XZY-YZX three-site interactions is more efficient to enhance the maximum value of quantum discord. Likewise, the cooperative effect of XZX+YZY and XZY-YZX interactions is the most optimal to increase the range of magnetic field or anisotropy parameter where quantum discord maintains the maximum value.
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页数：11
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