利用相位的自旋1/2量子系统的相干控制  

Coherent control of spin 1/2 quantum systems using phases

作　　者：丛爽[1] 楼越升[1] 

机构地区：[1]中国科学技术大学自动化系,安徽合肥230027

出　　处：《控制理论与应用》2008年第2期187-192,共6页Control Theory & Applications

基　　金：国家自然科学基金资助项目(60774098);国家重点基础研究发展计划资助项目(2006CB922004)

摘　　要：针对两个自旋1/2粒子组成的封闭量子系统,建立了具有Ising相互作用的量子系统模型.在此基础上通过具有特定幅值及相对相位的半反直觉脉冲,制备了相应的量子相干态.并通过系统数值仿真实验,归纳出系统终态与相对相位之间的近似关系式,分析了控制脉冲的幅值和时间延迟对制备过程的影响.利用部分绝热通道技术实现了相位相干控制.Model of a closed quantum system, which is composed of two spin 1/2 particles with interaction, is built. Specific quantum states are prepared by half-counterintuitive（HCI） pulses with fixed peak value and some selected relative phases. An approximate expression of the final state with relative phases as its parameter is derived from numerical system simulation experiments. The relation between the peak value, time delay of the two pulses and their effects to the preparation procedure are analyzed. Coherent control of quantum states with relative phases is achieved using partial adiabatic passage technology.

关 键 词：量子相干控制 半反直觉脉冲序列 相干态制备 相对相位 

分 类 号：TP11[自动化与计算机技术—控制理论与控制工程]