Entanglement and purity loss for the system of two 2-level atoms interacting with two-mode field

Abstract

An exact solution of the problem of two 2‑level atoms interacting with two mode field is obtained. For a chosen initial states, the effects of the mean photon number difference on the purity loss of the subsystem are considered. The atom-field entanglement is investigated on the basis of the reduced linear atomic entropy. For this system, we investigate the negativity as a measure of entanglement.