SPIN-CORRELATED INTERFEROMETRY FOR POLARIZED AND UNPOLARIZED PHOTONS ON A BEAM SPLITTER

Spin-correlated interferometry of the fourth order for independent pol arized as well as unpolarized photons arriving simultaneously at a bea m splitter and exhibiting spin correlation while leaving it is formula ted and discussed in the quantum approach. The beam splitter is recogn ized as a source of genuine singlet photon states. Also, typical noncl assical beating between photons taking part in the interference of the fourth order is given a polarization-dependent explanation.