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

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.

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

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 and 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 choosing the average photon number 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.