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APS » Journals » Phys. Rev. Lett. » Volume 71 » Issue 26
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Phys. Rev. Lett. 71, 4287–4290 (1993)

‘‘Event-ready-detectors’’ Bell experiment via entanglement swapping

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M. Żukowski
Institut für Experimentalphysik, Universität Innsbruck, A-6020 Innsbruck, Austria
Instytut Fizyki Teoretycznej i Astrofizyki, Uniwersytet Gdanski, PL-80-952 Gdansk, Poland

A. Zeilinger
Institut für Experimentalphysik, Universität Innsbruck, A-6020 Innsbruck, Austria

M. A. Horne
Stonehill College, North Easton, Massachusetts 02357

A. K. Ekert
Institut für Experimentalphysik, Universität Innsbruck, A-6020 Innsburck, Austria
Merton College and Physics Department, Oxford University, OX1 4JD Oxford, United Kindgom

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.

© 1993 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.71.4287
DOI:
10.1103/PhysRevLett.71.4287
PACS:
03.65.Bz, 42.50.Ar, 42.50.Dv
 
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