压缩真空场与原子非线性作用系统中场熵的压缩特性

The Entropy Squeezing Properties in the Nonlinear Interaction Between Squeezing Vacuum State Field and Atom

利用量子信息熵理论,研究了附加克尔介质的压缩真空场与二能级原子依赖强度耦合相互作用系统中场熵的压缩特性。讨论了初始压缩真空场的压缩度以及克尔非线性作用的强度对场熵压缩特性的影响。结果表明,无克尔介质量,场熵压缩的演化具有严格的周期性。克尔介质的非线性作用的强弱可以改变场熵压缩的周期性。在初始压缩真空场的压缩度较大(r=5)时,无论克尔介质作用的强弱如何变化,场熵始终处于被压缩状态。

The field entropy squeezing properties in the nonlinear interaction between squeezing vacuum state field and atom are studied by means of quantum information entropy theory. The influences of nonlinear interaction intensity of Kerr medium and the squeezing degree of initial squeezing vacuum state field on the entropy squeezing properties are discussed. The results show that the field entropy can be squeezed periodically without Kerr medium, and the nonlinear interaction intensity of Kerr medium can change the periodicities of evolution of the field entropy squeezing, the field may exhibit long-time entropy squeezing effect when the squeezing degree of initial squeezing vacuum state field is big ((r=5).)