Thermal entanglement in a two-qubit Heisenberg XY chain with the Dzyaloshinskii--Moriya interaction

doi:10.1088/1674-1056/17/8/009

中国物理B ›› 2008, Vol. 17 ›› Issue (8): 2800-2803.doi: 10.1088/1674-1056/17/8/009

Thermal entanglement in a two-qubit Heisenberg XY chain with the Dzyaloshinskii--Moriya interaction

徐胜龙¹, 秦猛², 陶应娟², 田东平³

(1)College of Physics and Information Technology, Shaanxi Normal University, Xi'an 710062, China; (2)School of Science, Xi'an Jiaotong University, Xi'an 710049, China; (3)Xi'an Institute of Post and Telecommunication, Xi'an 710061, China

收稿日期:2007-10-29 修回日期:2007-11-26 出版日期:2008-08-20 发布日期:2008-08-20

Thermal entanglement in a two-qubit Heisenberg XY chain with the Dzyaloshinskii--Moriya interaction

Qin Meng(秦猛)^a), Xu Sheng-Long(徐胜龙)^b), Tao Ying-Juan(陶应娟)^a), and Tian Dong-Ping(田东平)^c)^†

^a School of Science, Xi'an Jiaotong University, Xi'an 710049, China; ^b College of Physics and Information Technology, Shaanxi Normal University, Xi'an 710062, China; ^c Xi'an Institute of Post and Telecommunication, Xi'an 710061, China

Received:2007-10-29 Revised:2007-11-26 Online:2008-08-20 Published:2008-08-20

摘要/Abstract

摘要： This paper investigates thermal entanglements of a two-qubit Heisenberg $XY$ chain in the presence of the Dzyaloshinskii--Moriya anisotropic antisymmetric interaction. By the concept of concurrence, it is found that the effects of spin--orbit coupling on the entanglement are different from those of spin--spin model. The analytical expressions of concurrence are obtained for this model.

关键词: thermal entanglement, Heisenberg $XY$ chain, Dzyaloshinskii--Moriya interaction

Abstract: This paper investigates thermal entanglements of a two-qubit Heisenberg $XY$ chain in the presence of the Dzyaloshinskii--Moriya anisotropic antisymmetric interaction. By the concept of concurrence, it is found that the effects of spin--orbit coupling on the entanglement are different from those of spin--spin model. The analytical expressions of concurrence are obtained for this model.

Key words: thermal entanglement, Heisenberg $XY$ chain, Dzyaloshinskii--Moriya interaction

中图分类号: (Entanglement and quantum nonlocality)

03.65.Ud

03.67.-a (Quantum information) 75.10.Jm (Quantized spin models, including quantum spin frustration)

秦猛, 徐胜龙, 陶应娟, 田东平. Thermal entanglement in a two-qubit Heisenberg XY chain with the Dzyaloshinskii--Moriya interaction[J]. 中国物理B, 2008, 17(8): 2800-2803.

Qin Meng(秦猛), Xu Sheng-Long(徐胜龙), Tao Ying-Juan(陶应娟), and Tian Dong-Ping(田东平). Thermal entanglement in a two-qubit Heisenberg XY chain with the Dzyaloshinskii--Moriya interaction[J]. Chin. Phys. B, 2008, 17(8): 2800-2803.

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Thermal entanglement in a two-qubit Heisenberg XY chain with the Dzyaloshinskii--Moriya interaction

Thermal entanglement in a two-qubit Heisenberg XY chain with the Dzyaloshinskii--Moriya interaction

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