自旋为1的海森堡XX链的杂质纠缠

采用Negativity研究了匀强磁场下自旋为1的3-qutrit海森堡XX模型的基态纠缠和热纠缠. 分别探讨了纠缠伴随杂质, 温度、磁场的变化情况. 研究表明磁场的作用主要是降低纠缠, 磁场并不改变临界温度. 杂质的加入有利于增加纠缠, 临界温度的改变来自杂质参数J₁的变化. 可以通过调节温度T, 杂质参数J₁和磁场B来控制纠缠.

Impurity Entanglement in Spin-1 Heisenberg XX Chain

We investigate the impurity entanglement of the ground states and the thermal states at finite temperature for a three-qutrit system of the Heisenberg XX model in the presence of a uniform magnetic field. As a measure of the entanglement,negativity of the state is analyzed in detail as a function of the impurity parameter,temperature and magnetic fields.Magnetic fields are mainly to reduce entanglement.Impurity parameter plays an important role in enhancing the entanglement and improving the critical temperature.We can use them to control entanglement.