双模纠缠相干光场控制下双光子过程中有效二能级原子的信息熵压缩(英文)  

Information entropy squeezing of an effective two-level atom controlled by two-mode entangled coherent fields

作　　者：刘小娟[1] 周元俊[2] 

机构地区：[1]湖南科技大学物理学院,湘潭411201 [2]南京大学物理系,南京210093

出　　处：《原子与分子物理学报》2008年第5期1294-1300,共7页Journal of Atomic and Molecular Physics

基　　金：国家自然科学基金(19874020);湖南省自然科学基金(05JJ30004)

摘　　要：根据量子信息理论,研究了与双模纠缠相干场相互作用双光子过程中有效二能级原子的信息熵压缩.讨论了场的初态对信息熵压缩的因影响,并且比较了分别从基于信息熵测不准关系和海森堡测不准关系出发得出的结果.结果表明:信息熵压缩的稳定周期性、压缩方向分别由场的平均光子数和方向角控制,场的纠缠度对信息熵压缩不产生影响.信息熵压缩实现了对原子压缩效应的高灵敏量度.From a quantum information point of view we investigate the entropy squeezing properties for an effective two-level atom interacting with the two-mode entangled coherent fields via the two-photon transition. We discuss the influences of the initial state of the field on the atomic information entropy squeezing. We compare its results with those of atomic squeezing based on the Hesienbeg uncertainty relation. Our results show that the squeezed stable cycle, and squeezed direction of the information entropy squeezing can be controlled by the average photon number of the field and the direction angle of the field, respectively. Under a strong field , the entangled degree of the field has no effect on the information entropy squeezing. Quantum information entropy is a remarkable precision measure for the atomic squeezing.

关 键 词：信息熵压缩 方差压缩 海森堡不准关系熵测不准关系 

分 类 号：O431.2[机械工程—光学工程]