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Optics Communications

Implement a measurement of GHZ entanglement for a multipartite system via cavity QED

Liu Ye, Qi Liu

Published Mar 25, 2008• 5 citations
Publisher
DOI
10.1016/j.optcom.2008.03.004

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The scheme for preparing a multipartite entangled state and implementing 1→M economical phase-covariant quantum anti-cloning only by one step are proposed. By using the symmetric and asymmetric interactions between N atoms and the cavity, N-particle Greenberger–Horne–Zeilinger (GHZ) and W states are prepared, respectively. Furthermore, a scheme of 1→M anti-cloning is also proposed through preparing the W state. The decoherence from atomic spontaneous emission is negligible due to the excited state of the atom being adiabatically eliminated under large detuning. The scheme is insensitive to the cavity decay due to the cavity only being virtually excited. The experimental feasibility of the present scheme is also discussed.
Abstract Using a system of cavity quantum electrodynamics (QED) we present two schemes for multipartite entanglement generation. In the first scheme, a three-level atom is interacting with three cavities successively. In the second one, two three-level atoms are interacted with a coherent optical cavity. These protocols allow us to generate the six classes of tripartite entanglement (GHZ, W, A-B-C, AB-C, C-AB, and B-AC class states) by controling the interaction time between atoms and cavities. Moreover, they allow us to generate entanglement between the cavity fields degrees of freedom (from the first scheme), and a mixed entanglement between the cavity field degrees of freedom and the atomic degrees of freedom.