Approximate and Conditional Teleportation of an Unknown Atomic State Without Bell-State Measurement with Two-Photon Interaction

A scheme for approximately and conditionally teleporting an unknown atomic state via two-photon inter-action in cavity QED is proposed.It is the extension of the scheme of Ref.[11][Phys.Rev.A 69(2004)064302],whichis based on Jaynes-Cummings model in WED and where only a time point of system evolution and the correspondingfidelity implementing the teleportation are given.In our scheme,the two-photon interaction Jaynes-Cummings model isused to realize the approximate and conditional teleportation.Our scheme does not involve the Bell-state measurementand an additional atom,only requiring two atoms and one single-mode cavity.The fidelity of the scheme is higher thanthat of Ref.[11].The scheme may be generalized to not only the teleportation of the state of a cavity mode to anothermode by means of a single atom but also the teleportation of the state of a trapped ion.