双光子过程中任意初态原子的信息熵压缩  

Information entropy squeezing of the atom of an arbitrary initial state via the two-photon process

作　　者：刘小娟[1] 周并举[1] 方卯发[2] 周清平[2] 

机构地区：[1]湖南科技大学物理学院,湘潭411201 [2]湖南师范大学物理与信息学院

出　　处：《物理学报》2006年第2期704-711,共8页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10374025);湖南省自然科学基金(批准号:05JJ30004);湖南省教育厅项目(批准号:03c543)资助的课题.~~

摘　　要：运用量子信息熵理论研究了双光子过程中任意初态二能级原子与相干场相互作用的信息熵压缩,讨论了系统初态对原子信息熵压缩的影响.并且比较了分别从基于信息熵不确定关系和海森伯不确定关系出发得出的结果.结果表明通过选择适当初始的原子分布角,原子的混合度和相干场的位相角,可以分别控制原子信息熵压缩的偶极矩分量数、压缩频率、压缩幅度和压缩方向.当原子反转为零时,基于海森堡不确定关系的方差压缩定义不再有效,而信息熵压缩实现了对原子压缩效应的高灵敏量度.From the quantum information point of view we investigate the entropy squeezing properties of a two-level atom with arbitrary initial state interacting with the coherent field via the two-photon process. The influence of the initial state of the system on the atomic information entropy squeezing is discussed. The numerical results obtained from the uncertainly relation of quantum information entropy are compared with those obtained from the uncertainly relation of Heisenberg. It is shown that the number of squeezed component of the atomic dipole, squeezed frequency, squeezed amplitude and squeezed direction of the atomic information entropy squeezing can be controlled by choosing the initial atomic distribution angle, the atomic mixing degree and the relative phase of the field mode, respectively. Quantum information entropy is a remarkable precise measure for the atomic squeezing.

关 键 词：二能级原子 双光子过程 信息熵压缩 方差压缩 

分 类 号：O431.2[机械工程—光学工程] TP18[理学—光学]