Transient Dynamics of Light Propagation in A-Atom EIT Medium  

作　　者：LI Yong LIU Xu-Feng 

机构地区：[1]Institute of Theoretical Physics, the Chinese Academy of Sciences, Beijing 100080, China [2]Interdisciplinary Center of Theoretical Studies, the Chinese Academy of Sciences, Beijing 100080, China [3]Department of Mathematics, Peking University, Beijing 100871, China

出　　处：《Communications in Theoretical Physics》2005年第2X期356-364,共9页理论物理通讯（英文版）

基　　金：国家自然科学基金，国家重点基础研究发展计划(973计划)

摘　　要：We investigate the transient phenomenon or property of the propagationof an optical probe field in a medium consisting of many A-type three-level atoms coupled to this probe field and a classical driven field. We observe a hidden symmetry and obtain an exact solution for this light propagation problem by means of the spectral generating method. This solution enlightens us to propose a practical protocol implementing the quantum memory robust for quantum decoherence in a crystal. As a transient dynamic process this solution also manifests an exotic result that a wave-packet of light will split into three packets propagating at different group velocities. It is argued that "super-luminal group velocity" and "sub-luminal group velocity" can be observed simultaneously in the same system. This interesting phenomenon is expected to be demonstrated experimentally.

关 键 词：electromagnetically induced transparency group velocity collective excitation POLARITON 

分 类 号：O431.2[机械工程—光学工程]