Anisotropy and magnetic field effects on the entanglement of a two qubit Heisenberg XY chain -: art. no. 107901

被引：350

作者：

Kamta, GL ^{[1
]}

Starace, AF ^{[1
]}

机构：

[1] Univ Nebraska, Dept Phys & Astron, Brace Lab 116, Lincoln, NE 68588 USA

来源：

PHYSICAL REVIEW LETTERS | 2002年 / 88卷 / 10期

关键词：

D O I：

10.1103/PhysRevLett.88.107901

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate the entanglement of a two-qubit anisotropic Heisenberg XY chain in thermal equilibrium at temperature T in the presence of an external magnetic field B along the z axis. By means of the combined influences of anisotropic interactions and a magnetic field B, one is able to produce entanglement for any finite T, by adjusting the magnetic field strength. This contrasts with the isotropic interaction or the B=0 cases, for which there is no entanglement above a critical temperature T-c that is independent of the external B field.

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