Entropy squeezing of atom and the generation of Schrodinger-cat states in the three-photon Jaynes-Cummings model

In this work, we investigate the effect of the initial phase of the field and the atomic coherence on the time evolution of entropy squeezing of the atom and the atomic inversion in the three-photon Jaynes-Cummings model. Moreover, the evolution of the von Neumann entropy of the atom, Q function and the generation of the Schrodinger-cat states are examined. The results show that the entropy squeezing of the atom and the atomic inversion are sensitive to the initial phase of the field and the initial atomic state. It is also found that the Schrodinger-cat states of the cavity field can be obtained at one half of the revival time in the large photon number approximation. (C) 2012 Elsevier GmbH. All rights reserved.