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‘‘Event-ready-detectors’’ Bell experiment via entanglement swapping
Marek Żukowski (Universität Innsbruck, University of Gdańsk), Anton Zeilinger (Universität Innsbruck), Michael Horne (Stonehill College), A. K. Ekert (Universität Innsbruck, University of Oxford)
Résumé : Using independent sources one can realize an ``event-ready'' Bell--Einstein-Podolsky-Rosen experiment in which one can measure directly the probabilities of the various outcomes including nondetection of both particles. Our proposal involves two parametric down-converters. Subcoherence-time monitoring of the idlers provides a noninteractive quantum measurement entangling and preselecting the independent signals without touching them. We give the conditions for high fringe visibility and particle collection efficiency as required for a Bell test.