相移控制下Ising自旋链的量子态和纠缠的传递  

QUANTUM ENTANGLEMENT AND STATES TRANSFER IN SPIN-1/2 ISING CHAIN WITH PHASE TRANSITIONS CONTROL

作　　者：黄泽霞[1,2] 俞攸红[3] 

机构地区：[1]浙江工业大学信息学院,浙江杭州310023 [2]绍兴文理学院元培学院信息与电子系,浙江绍兴312000 [3]浙江工业大学理学院物理系,浙江杭州310023

出　　处：《计算机应用与软件》2012年第11期65-68,共4页Computer Applications and Software

基　　金：国家自然科学基金项目(10774131)

摘　　要：主要研究处于外部均匀磁场环境下,在Ising自旋二分之一链中,利用Aharonov-Casher形成的相位移动如何实现量子纠缠和量子态的传递。通过计算和数值仿真发现:调整Aharonov-Casher形成的相位移动就可以实现量子纠缠和量子态的传递。此外,通过计算量子态传递的平均保真度也可以看出:控制相位移动能有效地抵抗退相干的影响,增加系统的纠缠。We mainly study how the phase transitions formed with Aharonov-Casher realise the quantum entanglement and quantum state transfer in spin-1/2 Ising chains in condition of external uniform magnetic field. It is found through calculation and numerical simulation that the quantum entanglement and quantum state transfer can be achieved by adjusting the phase transitions formed with Aharonov-Casher. In addition, we can also see through calculating the average fidelity of quantum states transfer, the control of the phase transition can effectively resist the impact from decoherence and enhance the system entanglement.

关 键 词：均匀磁场 Ising自旋链 纠缠度 保真度 

分 类 号：TP18[自动化与计算机技术—控制理论与控制工程]