Greenberger-Horne-Zeilinger-type violation of local realism by mixed states

Details Greenberger-Horne-Zeilinger-type violation of local realism by mixed states Greenberger-Horne-Zeilinger-type violation of local realism by mixed states

2008-05-12

arxiv.org/abs/0805.1468v2

Phys. Rev. A 78, 012112 (2008)

Physics

Quantum Physics

four pages, five figures, revTex

Scientific paper

10.1103/PhysRevA.78.012112

Cluster 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.

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