About atom-field entanglement in two-photon Tavis–Cummings models

The characteristic properties of atom-field entanglement in various two-photon Tavis–Cummings models are considered both in terms of wave function dynamics and linear entropy dynamics for several initial pure atomic states and a strong coherent field. The expressions for disentanglement times are found for each model. The initial pure atomic states, which are necessary for the disentanglement of subsystem states, are determined.