Spin-correlated interferometry of the fourth order for independent polarized as well as unpolarized photons arriving simultaneously at a beam splitter and exhibiting spin correlation while leaving it is formulated and discussed in the quantum approach. The beam splitter is recognized as a source of genuine singlet photon states. Also, typical nonclassical beating between photons taking part in the interference of the fourth order is given a polarization-dependent explanation.
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Mladen Pavičić (1994) studied this question.
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