Phys. Rev. Lett. 64, 2495–2498 (1990)Experimental violation of Bell’s inequality based on phase and momentumReceived 26 February 1990; published in the issue dated 21 May 1990 Two-color photon pairs are selected by two double apertures placed to satisfy the phase-matching conditions at a down-conversion crystal. The different wavelengths are superposed at spatially separated points on a beamsplitter and coincident two-photon detections are measured. On adjusting phase plates in the beams before the beamsplitter an apparent nonlocal fourth-order interference effect is seen which violates Bell’s inequality by several standard deviations. © 1990 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.64.2495
DOI:
10.1103/PhysRevLett.64.2495
PACS:
42.50.Wm, 03.65.Bz, 42.10.Jd, 42.50.Dv
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