phase-controlled atom-photon entanglement in a three-level lambda type closed-loop atomic systems

In this paper we investigate the dynamical behavior of atom-photon entanglement in a three-level lambda type closed-loop atomic system. By using the reduced quantum entropy approach, it is shown that the entanglement depend on the relative phase and intensity of applied fields. Thus, we can control the atom-photon entanglement via the relative phase and intensity of applied fields. In addition, the atom-photon disentanglement is obtained for special selected parameters.