Entanglement Swapping and Preparing Nonclassical Field Jaynes-Cummings Model with an Entangled State of by Nonlinear Atoms

The interaction of a cavity field with an entangled state of atoms is studied according to the nonlinear Jaynes-Cummings model. It is shown that the properties of the cavity field depend on not only the interaction time but also the nonlinear constant. After detecting an atom of the entangled state, the cavity field will be entangled with another atom even it is far away from the cavity. It is proved that the nonclassical properties of the field state are dramatically different from those in the case of no selective measurement.