Abstract
In this paper we introduce a new version of the interaction between a two-level atom and an external electric field in the presence of the classical field. Under a certain condition the system is transformed to the usual Jaynes-Cummings model. The atomic inversion is investigated where the phenomenon of super-structure is reported for a large value of the classical field coupling parameter. Assuming that the field is initially in the displaced thermal state the variance and the entropy squeezing as well as the degree of entanglement are discussed. Our results show that the information of variance and entropy squeezing beside the purity can be controlled by both of the coupling parameter of the classical field and the mean photon number. In this context the variance and the entropy squeezing become more pronounced for large values of the classical field coupling, while the system shows period of disentanglement during the considered time. (C) 2011 Elsevier B.V. All rights reserved.