运用“部分受激拉曼绝热通道”制备串行Λ系统相干叠加态

讨论了在串行Λ系统中制备初态和末态的连续叠加态的方法,这种方法是部分受激拉曼绝热通道的扩充.但是它又不同于部分受激拉曼绝热通道,每个斯托克斯脉冲先行相应的泵浦脉冲,但是所有的中间脉冲提前并且同时消失,而第一束斯托克斯脉冲和最后一束泵浦脉冲稍后同时消失.应用数值方法讨论了脉冲驰豫时间和失谐量对该方法的影响.数值结果表明要制备任意的叠加态,不仅要满足双光子共振,而且要满足单光子共振.     

Preparing of coherent superposition state in serial multi-∧-type system by stimulated Raman adiabatic passage

A scheme for creating an arbitrary coherent superposition of two atomic states in serial multi-A-type system is proposed. This technique with the application of a control field is based on the existence of two degenerate dark states and their interaction. The mixing of the dark states can be controlled by changing the relative delay time of the control pulse. One can get any desired superposition by changing the delay time of the control pulse.     

Population transfer in multilevel system through modified stimulated Raman adiabatic passage

Stimulated Raman adiabatic passage(STIRAP)has been successfully extended to multilevel system.Dur- ing the STIRAP process,the intermediate levels have notable population which is detrimental if these levels could decay to other levels through spontaneous emission.This paper proposes a novel method to reduce the intermediate level population during the STIRAP process.A complete population transfer can be achieved in this modified STIRAP even if the intermediate level decays to other levels.     

在多能级∧系统中运用“部分受激拉曼绝热通道”制备相干叠加态(英文)

我们给出了在A型五能级系统中制备| 3态和| 5态的连续叠加态的方法,这种方法是部分受激拉曼绝热通道的扩充。但是它又不同于部分受激拉曼绝热通道,我们设计了新的斯托克斯脉冲和相应的泵浦脉冲。进而应用数值方法讨论了脉冲驰豫时间和失谐量对该方法的影响.数值结果表明要制备任意的叠加态要满足双光子共振.这种方法可以推广到多能级A系统中制备任意两个下面能级的叠加态.