Quantum state transfer for two atoms with a single resonant interaction

We present a scheme for transferring an unknown atomic entangled state with a single resonant interaction. This scheme only requires a single resonant interaction of two atoms with a cavity mode and does riot use the cavity mode as the memory. Thus the scheme is very simple and the interaction time is very short, which is important in view of decoherence. Quantnm state can be directly transferred from two atoms to another two atoms with a successful probability of 100 percent.