Abstract
We study the interaction of a three-level atom with a one-mode cavity field inthe presence of a Kerr-like medium. The atom is initially prepared in amomentum eigenstate and the field in the squeezed state. We obtain theconstants of motion and the wavefunction for the atomic system of Λ-configuration.Also, we calculate the momentum increment, the momentum diffusionand the field entropy. The analytic results are employed to perform someinvestigations of the temporal evolution of the momentum increment and the fieldentropy. The effect of the detuning and the Kerr-like medium is analysed.The results show that the effect of the detuning and/or the Kerr-likemedium changes the quasi-period of both the momentum increment and thefield entropy evolution and entanglement between the atom and the field.Conclusions and discussion are given and illustrated by numerical results.
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