Single-atom entropy squeezing for two two-level atoms interacting with a single-mode radiation field

摘要

In this paper we consider a system of two two-level atoms interacting with asingle-mode quantized electromagnetic field in a lossless resonant cavity via$l$-photon-transition mechanism. The field and the atoms are initially preparedin the coherent state and the excited atomic states, respectively. For thissystem we investigate the entropy squeezing, the atomic variances, the vonNeumann entropy and the atomic inversions for the single-atom case. We showthat the more the number of the parties in the system the less the amounts ofthe nonclassical effects exhibited in the entropy squeezing. The entropy squeezing can give information on the corresponding von Neumannentropy. Also the nonclassical effects obtained form the asymmetric atoms aregreater than those obtained form the symmetric atoms. Finally, the entropysqueezing gives better information than the atomic variances only for theasymmetric atoms.