二量子比特海森堡XYZ链中的热纠缠

Thermal Entanglement of a Two-Qubit Heisenberg XYZ Chain

通过分析外磁场、温度、自旋粒子间耦合系数、非对称系数对系统纠缠的影响,研究了均匀磁场中二量子比特海森堡XYZ链中的热纠缠现象.结果表明,系统的基态纠缠随着外磁场B值的增加,保持一段恒定且最大值后,在一个临界点Bc突然下降.耦合系数Jz值的增加可以使纠缠无论是在温度方向还是在磁场方向都能扩展.在一定温度条件下,增加非对称系数γ值可以使纠缠在超越临界磁场Bc后的复苏值和范围都增加.这些结果为用磁场、自旋粒子间耦合系数、非对称系数来操纵系统纠缠提供了理论依据.

Thermal entanglement of a two-qubit Heisenberg XYZ chain is studied. It is found that the ground state entanglement maintains a maximal constant until it drops suddenly at a critical magnetic field . Increasing the value of can extend the entanglement region in terms of temperature and magnetic field. At a finite temperature, increasing the anisotropy parameter can enhance and extend the revival entanglement when the magnetic field is beyond the critical point . These results may provide theoretical proof for manipulating the entanglement with magnetic field, strength of interaction and anisotropy parameter.