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29 March 2024
 
  » arxiv » 0805.1468

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Greenberger-Horne-Zeilinger-type violation of local realism by mixed states
X.-Q. Zhou ; C.-Y. Lu ; W.-B. Gao ; J. Zhang ; Z.-B. Chen ; T. Yang ; J.-W. Pan ;
Date 12 May 2008
AbstractCluster states are multi-particle entangled states with special entanglement properties particularly suitable for quantum computation. It has been shown that cluster states can exhibit Greenberger-Horne-Zeilinger (GHZ)-type non-locality even when some of their qubits have been lost. In the present work, we generated a four-photon mixed state, which is equivalent to the partial, qubit-loss state of an N-qubit cluster state up to some local transformations. By using this mixed state, we then realize a GHZ-type violation of local realism. Our results not only demonstrate a mixed state’s GHZ-type non-locality but also exhibit the robustness of cluster states under qubit-loss conditions.
Source arXiv, 0805.1468
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