Thermal entanglement in Tavis–Cummings model with Kerr nonlinearity

In this paper, we investigate entanglement between two two-level atoms when they simultaneously interact with a single-mode thermal field of a lossless cavity with Kerr medium. We show that a slight Kerr nonlinearity might enhance the degree of entanglement between the atoms. More interestingly, both atoms would somehow get entangled even when both atoms are initially in the excited state.