Bell theorem without inequalities for two particles. I. Efficient detectors

Daniel M. Greenberger, Michael A. Horne, Anton Zeilinger

Publications: Contribution to journalArticlePeer Reviewed


We consider an entangled two-particle state that is produced from two independent downconversion laser sources by the process of "entanglement swapping," so that the particles have never met. We prove a Greenberger-Horne-Zeilinger type theorem, showing that any deterministic, local, realistic theory is inconsistent with the quantum-mechanical perfect correlations for such a state. This theorem holds for individual events, with no inequalities, for detectors of 100% efficiency.
Original languageEnglish
Article number022110
Number of pages7
JournalPhysical Review A
Publication statusPublished - 2008

Austrian Fields of Science 2012

  • 103026 Quantum optics

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