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Communications in Theoretical Physics

Preparation of a New Type of Multiqubit Entangled States in Cavity QED

Xiong Wen-yuan, Xin-Wen Wang, Li-Xin Xia

Published Sep 1, 2008• 0 citations
Publisher

Abstract

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.

DOI
10.1088/0253-6102/50/3/43

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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.
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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.
In this paper, we present a scheme to prepare a set of the multi-atom entangled states by the cavity quantum electrodynamics (QED) technology. The multi-atom entangled states have some particular entanglement properties. For example, the remaining reduced density matrices ρ ij still retain entanglement or disentanglement when any N -2 atoms of the N atoms are traced out, which can be chosen freely according to our need and the relative entanglement strength of any pair of atoms (measured by the concurrence) can be arbitrarily adjusted. In addition, they may be completely symmetric under the exchange of any two atoms and perform certain quantum information tasks, such as telecloning, teleportation, secret sharing and so on.