Jaynes-cummings Model In The Four-body Features Of The Evolution Of Symbiotic Entanglement,

We realized the four-body approximate W state by the interaction of two atoms and two mode vacuum cavity fields, no matter the two atoms are initially in Einstein-Podolsky-Rosen entangled states or in disentangled states. The four-body entanglement changes with the initial state of the system and detuning degree. What's important, when the two atoms are initially in Einstein-Podolsky-Rosen, the entanglement of atom-atom and field-field can reach the maximal value 1. And if the two atoms are initially in disentangled state, the entanglement of atom-atom and field-field won't go beyond 1/2.