POLARIZATION STRUCTURE OF QUANTUM LIGHT FIELDS - A NEW INSIGHT .1. GENERAL OUTLOOK

A new consequent description of the polarization structure of light wi thin the framework of quantum optics is given by using the polarizatio n gauge SU(2) invariance of free electromagnetic fields and a related concept of the polarization (P) spin. Within this approach the quantum light may be thought as a mixture of the usual polarized photons and unpolarized biphotons. New classes of unpolarized light states generat ed by P-scalar biphotons are examined. Possible applications are brief ly discussed.