Abstract
It is demonstrated in a photon coincidence experiment with two photodetectors, in which signal and idler photons produced by parametric down-conversion are allowed to interfere, that the visibility of the interference pattern is well above 50% and remains unchanged when one of the two light beams is attenuated ninefold compared with the other. These results violate classical probability for light waves.
- Received 28 November 1988
DOI:https://doi.org/10.1103/PhysRevLett.62.2941
©1989 American Physical Society
