多光子跃迁过程中的量子衍射与量子相干控制  

Quantum Diffraction and Quantum Coherent Control During Multi-Photon Transition

作　　者：王鹏[1] 

机构地区：[1]延安大学物理与电子信息学院,陕西延安716000

出　　处：《激光与光电子学进展》2011年第7期154-159,共6页Laser & Optoelectronics Progress

摘　　要：从理论上解释了利用相位调制光场如何实现多光子跃迁的量子相干控制。在弱场作用下研究了几种整形激光脉冲形式与二能级原子系统的相互作用过程,研究了整形激光脉冲作用下双光子过程中的量子衍射效应。利用微扰理论给出了多光子跃迁过程的解析表示,根据解析表示解释了阶跃相位和余弦相位调制光场作用下多光子跃迁几率的量子相干控制。结果表明,这两种相干控制过程中都有跃迁几率消除现象,而且不同调制相位光场的作用结果对应着不同的几率消除位置。We theoretically explain how to achive the quantum coherent control of multi-photon transition by phasemodulated lighffield. The interaction between several types of shaped laser pulse and a two-level system is studied within the weak field regime. Quantum diffraction effect during the two-photon transition affected by a shaped laser pulse is studied. Under the perturbation theory, the analytical solutions of multi-photon transition probabilities are obtained. Based on these analytical expressions, we demonstrate that the quantum coherent control of multi-photon transition is affected by step-phase modulated laser and cosinusoidally phase modulated laser. It is shown that the elimination of transition probabilities exist in these two processes, and the two results have different probability elimination positions.

关 键 词：量子光学 多光子跃迁 量子衍射 量子相干控制 

分 类 号：O431.2[机械工程—光学工程]