Spacelike Separation in a Bell Test Assuming Gravitationally Induced Collapses

D. Salart, A. Baas, J. A. W. van Houwelingen, N. Gisin, and H. Zbinden
Phys. Rev. Lett. 100, 220404 – Published 6 June 2008

Abstract

We report on a Bell experiment with spacelike separation assuming that the measurement time is related to gravity-induced state reduction. Two energy-time entangled photons are sent through optical fibers and directed into unbalanced interferometers at two receiving stations separated by 18 km. At each station, the detection of a photon triggers the displacement of a macroscopic mass. The timing ensures spacelike separation from the moment a photon enters its interferometer until the mass has moved. Two-photon interference fringes with a visibility of up to 90.5% are obtained, leading to a violation of the Bell inequality.

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  • Received 26 March 2008

DOI:https://doi.org/10.1103/PhysRevLett.100.220404

©2008 American Physical Society

Authors & Affiliations

D. Salart, A. Baas, J. A. W. van Houwelingen, N. Gisin, and H. Zbinden

  • Group of Applied Physics, University of Geneva, 20, Rue de l’Ecole de Médecine, CH-1211 Geneva 4, Switzerland

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Issue

Vol. 100, Iss. 22 — 6 June 2008

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