摘要
利用海森堡XY模型,通过密度矩阵的方法研究了三量子比特在外加磁场下的热纠缠,计算了纠缠的度量——并协度,给出了有限温度条件下不同外加磁场下的纠缠行为.在此基础上,可以通过对外加磁场的调节对量子比特进行有效的控制,实现量子计算和得到最有利的纠缠.
In our paper, we study the thermal entanglement in three quibts under external magnetic field, using Heisenherg XY model, through method of density matrix. And We compute the entanglement-concurrence. We find the quantumquibt＇s entanglement behaviour under different external magnetic field at limit temperature. Base on our conclusion, one may realize quantum computation and get the most favourable entanglement by effective control on quantum bit through external magnetic field＇s adjusting.
出处
《新疆大学学报（自然科学版）》
CAS
2005年第4期434-438,共5页
Journal of Xinjiang University(Natural Science Edition)
关键词
量子信息
热纠缠
密度矩阵
非均匀磁场
并协度
quantum information
thermal entanglement
density matrix
non-uniform magnetic field
concurrence
