Phase-controlled atom-photon entanglement in a three-level V-type atomic   system via spontaneously generated coherence
  We investigate the dynamical behavior of the atom-photon entanglement in a V-type three-level quantum system using the atomic reduced entropy. It is shown that an atom and photons are entangled at the steady-state; however disentanglement can also be achieved in an especial condition. It is demonstrated that in the presence of quantum interference induced by spontaneous emission, the reduced entropy and the atom-photon entanglement are phase-dependent. Non-stationary solution is also obtained when the quantum interference due to the spontaneous emission is completely included. 
Mohammad Abazari, Ali Mortezapour, Mohammad Mahmoudi, and Mostafa   Sahrai
quant-ph