Spin interferometry of the 4th order for independent polarized as well asunpolarized photons arriving simultaneously at a beam splitter and exhibitingspin correlation while leaving it, is formulated and discussed in the quantumapproach. Beam splitter is recognized as a source of genuine singlet photonstates. Also, typical nonclassical beating between photons taking part in theinterference of the 4th order is given a polarization dependent explanation.
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