三比特铁磁质海森堡自旋链模型的热纠缠

Entanglement in a three-qubit ferrmagnetic heisenberg spin chain system

本文对带Dzyaloshinskii-Moriya(DM)相互作用的铁磁质海森堡XXZ自旋链模型在磁场中的热纠缠进行了详细地计算和分析.通过画图发现铁磁质模型的热纠缠远大于反铁磁质模型的热纠缠.同时发现外磁场B,耦合系数J_Z和DM相互作用D都可以有效地控制纠缠和临界温度T_C.该结论为实验上利用海森堡XXZ模型的纠缠特性进行隐形传态提供了很好的理论依据.

In this paper,we study entanglement of a three-qubit ferromagnetic Heisenberg XXZ chain with Dzyaloshinskii-Moriya（ DM） interaction and obtain the expression for concurrence,which is a function of DM interaction parameter D,the coupling coefficient JZ,external magnetic Band temperature T.It is found that these parameters not only control the entanglement,but also enhance the critical temperature TC.What’s more,we find the ferromagnetic model has a higher entanglement than antiferromagnetic model.The result could provide theoretical basis for later experiment.