双量子系统最大纠缠态制备的两种控制方法

分别采用两种脉冲序列,对由两个自旋1/2粒子组成的四能级量子系统进行最大纠缠态的制备.基于部分受激拉曼绝热通道技术,设计了半反直觉脉冲序列;同时设计了基于面积控制的π脉冲控制序列.通过系统仿真实验,在参数选取对纠缠态制备性能影响分析的基础上,详细地给出了纠缠态制备中各个参数的优化过程,包括不同参数对纠缠态制备过程中系统几率影响的分析,纠缠态制备最佳参数的选取,以及制备系统最大纠缠态或贝尔(Bell)基态控制参数值的确定.

Two control methods for the maximum entangled states preparations of a double quantum system

For a four-level quantum system which is composed of two spin-1/2 particles, we use two different kinds of pulse sequences to prepare the maximum entangled states. Based on the fractional stimulated Raman adiabatic passage method, we design the half-counterintuitive pulse sequences. At the same time, the $pi$ pulse sequences which are based on pulse area control are also designed. We analyze the effect of different parameter values on the preparation performance of entangled states according to the system simulation experimental results. The optimization process of each parameter during the entangled state preparation is given in detail including analyzing the effect of different parameters on the system probability during the preparation of entangled state, selecting the best parameters for entanglement states''preparations and determining the control parameter values for the maximum entanglement states preparations, and Bell ground states preparations.