Quantum correlations in the dimerized spin chain at zero and finite temperatures

被引：3

作者：

Jiang, J-J ^{[1
]}

Liu, Y-J ^{[2
]}

Tang, F. ^{[3
]}

Yang, C-H ^{[4
]}

机构：

[1] Sanjiang Coll, Dept Phys, Nanjing 210012, Peoples R China

[2] Yangzhou Univ, Sch Phys Sci & Technol, Yangzhou 225002, Peoples R China

[3] Yangzhou Polytech Inst, Dept Elect & Informat Engn, Yangzhou 225002, Peoples R China

[4] Nanjing Univ Informat Sci & Technol, Fac Math & Phys, Nanjing 210044, Peoples R China

来源：

EUROPEAN PHYSICAL JOURNAL B | 2011年 / 81卷 / 04期

关键词：

STATE; ENTANGLEMENT;

D O I：

10.1140/epjb/e2011-20280-1

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

By using the method of exact diagonalization, we investigate the quantum correlation measured by quantum discord of the dimerized spin chain at both zero and finite temperatures. The results disclose that the quantum discord is robust at any finite parameter alpha and temperature T, in contrast to entanglement which shows a sudden death when the parameter alpha or the temperature T reaches a critical point. At finite temperature, it is interesting to find that the quantum discord QD (2i-1, 2i) can increase with temperature T no matter if the entanglement EoF (2i-1, 2i) exists or not. The research on the relation between the quantum discord and the quantum phase transition in the dimerized spin chain indicates that the transition can be characterized by the first derivation of the quantum discord at zero and low temperatures.

引用

页码：419 / 424

页数：6