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 ,耦合系数 和DM相互作用 都可以有效地控制纠缠和临界温度 . 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 interaction and obtain the expression for concurrence, which is a function of DM interaction parameter , the coupling coefficient , external magnetic and temperature . It is found that these parameters not only control the entanglement, but also enhance the critical temperature . What’s more, we find the ferromagnetic model has a higher entanglement than antiferromagnetic model. The result could provide theoretical basis for later experiment.