Entanglement swapping between atom and cavity and generation of entangled state of cavity fields

This paper proposes a scheme where entanglement swapping between atom and cavity canbe realized. Lambda -type three-level atoms interacting resonantly withcavity field are considered. By detecting atom and cavity field, itrealizes entanglement swapping between atom and cavity. It uses the techniqueof entanglement swapping to generate an entangled state of two cavity fieldsby measuring on atoms. It discusses the experimental feasibility ofthe proposed schemeand application of entangled state of cavity fields.