Dynamics of entropy and nonclassicality features of the interaction between a $\diamondsuit$-type four-level atom and a single-mode field in the presence of intensity-dependent coupling and Kerr nonlinearity

TL;DR

This paper analyzes how Kerr nonlinearity, intensity-dependent coupling, and multi-photon processes influence the entanglement and nonclassical properties of a four-level atom interacting with a single-mode field, providing exact solutions and insights for quantum optics.

Contribution

It presents an exact analytical solution for a four-level atom-field system with Kerr nonlinearity and intensity-dependent coupling, exploring their effects on nonclassical features.

Findings

Kerr medium and detuning significantly affect entanglement dynamics.

Proper parameter choices can enhance nonclassical properties.

The model offers insights for quantum information processing applications.

Abstract

The interaction between a $\diamondsuit$-type four-level atom and a single-mode field in the presence of Kerr medium with intensity-dependent coupling involving multi-photon processes has been studied. Using the generalized (nonlinear) Jaynes-Cummings model, the exact analytical solution of the wave function for the considered system under particular condition, has been obtained when the atom is initially excited to the topmost level and the field is in a coherent state. Some physical properties of the atom-field entangled state such as linear entropy showing the entanglement degree, Mandel parameter, mean photon number and normal squeezing of the resultant state have been calculated. The effects of Kerr medium, detuning and the intensity-dependent coupling on the temporal behavior of the latter mentioned nonclassical properties have been investigated. It is shown that by appropriately choosing the evolved parameters in the interaction process, each of the above nonclassicality features, which are of special interest in quantum optics as well as quantum information processing, can be revealed.