双Λ型原子系统中制备相干叠加态的研究(英文)

Creation of coherent superposition states in the double Λ-type atomic system

本文讨论了在双Λ型原子系统中制备相干叠加态的方法:一个Λ型系统通过控制激光而另一个Λ型系统采用部分受激拉曼绝热通道的方法.在理论上分析了产生任意相干叠加态的可能性并且讨论了透热系统在产生相干叠加态过程中的重要性.研究表明,没有透热过程是不可能制备出任意的叠加态.应用数值方法验证理论分析是正确,并且指出任意叠加态的产生只与控制脉冲的时间延迟有关.

Λ scheme to create coherent superposition states in double Λ-type six-level system is proposed. This system is based upon a Λ-type system with the application of a control field and a fractional stimulated Raman adiabatic passage （f-STIRAP）. An arbitrary superposition state can be generated in the adiabatic limit and in the diabatic system. Without the diabatic system, the preselected coherent superposition state is not created. We give a numerical simulation of coherence generation in the six-level system and demonstrate our analysis is true. It is shown that an arbitrary atomic superposition states can be created by varying the delay of the control pulse.