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Journal of Hefei Teachers College

Scheme for Controlled Teleportation of Single Atomic State in Cavity QED

Gang Zhang

Published Jan 1, 2009• 0 citations
OpenAlex

Abstract

A controlled teleportation scheme for single atomic quantum state is proposed in cavity QED.The scheme is based on the large detuning interaction of the atom-cavity system,therefore,it is not insensitive to the decoherence induced by cavity decay.The scheme also incorporates a third party to control the process,and only with the cooperation of the third party,the receiver can successfully reconstruct the original atom state.Finally,the feasibility of the experimentally realization of the scheme is also discussed.

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A controlled teleportation scheme for single atomic quantum state is proposed in cavity QED.The scheme is based on the large detuning interaction of the atom-cavity system,therefore,it is not insensitive to the decoherence induced by cavity decay.The scheme also incorporates a third party to control the process,and only with the cooperation of the third party,the receiver can successfully reconstruct the original atom state.Finally,the feasibility of the experimentally realization of the scheme is also discussed.
We propose a scheme for controlled teleportion of an arbitrary two-atom state in cavity QED. In the scheme a GHZ state and an EPR pair are chosen as quantum channels. The sender can teleport quantum information to the receiver with the help of the controller. In the teleportation process two pairs of atoms interact respectively with two identical single-mode cavities; meanwhile, the two pairs of atoms are respectively driven by two identical classical fields. The scheme is insensitive to the cavity decay and thermal field and the success probability is 1.0.
We propose a feasible scheme for implementing probabilistic teleportation of an unknown atomic state. In this scheme, atom 1 is initially in an arbitrary state, atoms 2 and 3 are prepared in a partially entangled pure state. After receiving the result of Bell-state measurement performed by Alice on atoms 1 ant 2, Bob lets atoms 2 and auxiliary atom A simultaneously interact with a single-mode vacuum cavity. Only controlling the interact time, we can reconstruct the initial state of atom 1 on the atom 3, i.e. double of square of mode of smaller coefficient of superposition state serving as quantum channel. Moreover, our scheme is insensitive to cavity decay, because atoms are interacting with a large detuning vacuum cavity field.
Recently Yang, Chu, and Han [Phys. Rev. A 70 (2004) 022329] presented a new type of multipartite entangled states for implementing efficient many-party controlled teleportation of multiqubit quantum information. Here we propose a simple scheme for preparing such a type of multi-atom entangled states in cavity quantum electrodynamics (QED). The scheme involves atom-cavity interaction with large detuning, and is immune to the cavity decay and the thermal field states. Some practical analyses show its availability with the present technology.