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arXiv:1708.03881 · Nature Photonics

Experimental Greenberger–Horne–Zeilinger entanglement beyond qubits

Manuel Erhard, Mehul Malik, Mario Krenn, Anton Zeilinger

Published Oct 17, 2018• 182 citations
arXivHTMLPDF
DOI
10.1038/s41566-018-0257-6

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The paradox of Greenberger-Horne-Zeilinger (GHZ) disproves directly the concept of EPR elements of reality, based on the EPR correlations, in an all-versus-nothing way. A three-qubit experimental demonstration of the GHZ paradox was achieved nearly 20 years ago, followed by demonstrations for more qubits. Still, the GHZ contradictions underlying the tests can be reduced to a three-qubit one. We show an irreducible four-qubit GHZ paradox, and report its experimental demonstration. The bound of a three-setting-per-party Bell-GHZ inequality is violated by $7\ensuremath{\sigma}$. The fidelity of the GHZ state was around 8181%81, and an entanglement witness reveals a violation of the separability threshold by $19\ensuremath{\sigma}$.