与量子光场相互作用的运动原子的熵压缩  

Entropy Squeezing for a Two-Level Atom in Motion Interacting with a Quantized Field

作　　者：廖湘萍[1] 方卯发[1] 

机构地区：[1]湖南师范大学物理与信息科学学院

出　　处：《光学学报》2004年第7期983-988,共6页Acta Optica Sinica

基　　金：国家自然科学基金 ( 10 374 0 2 5 )资助课题

摘　　要：运用量子信息熵理论 ,研究了与量子光场相互作用的二能级运动原子的熵压缩 ,讨论了原子运动和场模结构对原子熵压缩的影响 ,并且比较了分别从基于信息熵测不准关系和海森伯测不准关系出发得出的结果 ,表明原子的运动导致了原子熵压缩的周期性演化 ;随着场模结构参量的增大 ,熵压缩的演化周期缩短 ,压缩时间延长 ;选择适当的系统参量 ,运动原子能够呈现长时间的持续熵压缩效应。当原子反转为零时 ,基于海伯堡测不准关系的方差压缩定义不再有效 ,而熵压缩实现了对原子压缩效应的高灵敏量度。The entropy squeezing of a two level atom in motion interacting with a quantized field is investigated using quantum information entropy. The influences of the atomic motion and the field mode structure on the atomic entropy squeezing are discussed. The numerical results obtained from the uncertainty relation of quantum information entropy are compared to those obtained from the uncertainty relation of Heisenberg. It is shown that the atomic motion leads to the periodic evolution of the entropy squeezing; an increase in field mode structure parameter results in not only shortening of the evolution period of the entropy squeezing but also prolonging of the squeezing time; the moving atom may exhibit long time entropy squeezing effect for some choisen system parameters; the definition of variance squeezing based on the uncertainty relation of Heisenberg is trivial when atomic inversion is zero and the information entropy squeezing is a high sensitive measure for the squeezing effect of the atom.

关 键 词：量子光学 压缩 运动原子的熵压缩 方差压缩 场模结构参量 

分 类 号：O431[机械工程—光学工程]