In parametric-downconversion luminescence, one photon incident in a nonlinear crystal is spontaneously converted in two simultaneous photons (signal and idler beams). It was shown recently that Young's double-slit interference patterns can be detected by performing coincidence measurements between the signal and the idler.1 The degree of visibility obtained with a double slit placed at the signal beam can be nonlocally controlled through the idler beam.

© 1995 Optical Society of America

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