Anisotropy and magnetic field effects on the entanglement of a two qubit Heisenberg XY chain.
Anisotropy and magnetic field effects on the entanglement of a two qubit Heisenberg XY chain.
复制标题
DOI：
10.1103/physrevlett.88.107901
复制
发表时间：
2002-02
影响因子：
8.6
通讯作者：
G. Lagmago Kamta;A. Starace
中科院分区：
文献类型：
--
作者：
G. Lagmago Kamta;A. Starace
研究了在温度T下，外加磁场B沿着z轴作用下，处于热平衡态的两量子比特各向异性海森堡XY链的纠缠.借助于各向异性相互作用和磁场B的组合影响，通过调节磁场强度，能够对任何有限的T产生纠缠。这与各向同性相互作用或B = 0的情况形成对比，对于这些情况，在临界温度T（c）以上不存在与外部B场无关的纠缠。
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.