Abstract

The quantum nature of light produced in type I spontaneous optical parametric downconversion has received a great deal of attention since its demonstration in an Einstein-Podolsky-Rosen (EPR) experiment. In all previous experiments, the parallel polarized photon pair is injected into two input ports of a beam-splitter and detected coincidentally by two detectors placed in the two output ports of the beamsplitter. Experimental studies for the quantum nature of light generated from type II spontaneous optical parametric downconversion have been reported recently by our group. The entanglement of the orthogonally polarized light quanta pair was demonstrated.

© 1994 IEEE