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 interaction in cavity QED is proposed. It is theextension of the scheme of Ref. [11] [Phys. Rev. A 69 (2004) 064302],which is based on Jaynes-Cummings model in QED and where only a time point ofsystem evolution and the corresponding fidelity implementing the teleportationare given. In our scheme, the two-photon interaction Jaynes-Cummings model is used to realize the approximate and conditional teleportation. Our scheme doesnot involve the Bell-state measurement and an additional atom, only requiringtwo atoms and one single-mode cavity. The fidelity of the scheme is higherthan that of Ref. [11]. The scheme may be generalized to not only theteleportation of the state of a cavity mode to another mode by means of asingle atom but also the teleportation of the state of a trapped ion.