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00925njm 22002777a 4500 dc Acín dal Maschio, Antonio author Latorre, José Ignacio author Pascual, Pedro, 1934-2006 author 2009-10-06T10:13:35Z 2009-10-06T10:13:35Z 2001 The decay of orthopositronium into three photons produces a physical realization of a pure state with three-party entanglement. Its quantum correlations are analyzed using recent results on quantum information theory, looking for the final state that has the maximal amount of Greenberger, Horne, and Zeilinger like correlations. This state allows for a statistical dismissal of local realism stronger than the one obtained using any entangled state of two spin one-half particles. Teoria quàntica Teoria de la informació Electrodinàmica quàntica Quantum theory Information theory Quantum electrodynamics Three-party entanglement from positronium