Generation and application of a controllable multi-atom entangled state
Huang Yan-Xia (黄燕霞)ab, Zhan Ming-Sheng (詹明生)b
a Department of Physics, Hubei Normal University, Huangshi 435002, China; b State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China
Abstract 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 $\rho_{ij}$ 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.
Received: 22 December 2003
Revised: 06 July 2004
Accepted manuscript online:
PACS:
03.67.Mn
(Entanglement measures, witnesses, and other characterizations)
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