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Greenberger-Horne-Zeilinger paradoxes for many qudits

Nicolas J. Cerf, Serge Massar, Stefano Pironio

quant-pharXiv:quant-ph/0107031

Abstract

We construct GHZ contradictions for three or more parties sharing an entangled state, the dimension d of each subsystem being an even integer greater than 2. The simplest example that goes beyond the standard GHZ paradox (three qubits) involves five ququats (d=4). We then examine the criteria a GHZ paradox must satisfy in order to be genuinely M-partite and d-dimensional.

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