title: Spacelike separation in a Bell test assuming gravitationally induced collapses.
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.
authors.affiliation: Group of Applied Physics, University of Geneva, 20, Rue de l'Ecole de Médecine, CH-1211 Geneva 4, Switzerland.
authors.forename: D
authors.initials: D
authors.lastname: Salart
authors.forename: A
authors.initials: A
authors.lastname: Baas
authors.forename: J A W
authors.initials: JA
authors.lastname: van Houwelingen
authors.forename: N
authors.initials: N
authors.lastname: Gisin
authors.forename: H
authors.initials: H
authors.lastname: Zbinden