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Polarization quasi-probability distribution (PQPD) is defined in the Stokesspace, and it enables the calculation of mean values and higher-order momentsfor polarization observables using simple algebraic averaging. It can bereconstructed with the help of polarization quantum tomography and provides afull description of the polarization properties of quantum states of light.  We show here that, due to its definition in terms of the discrete-valuedStokes operators, polarization quasi-probability distribution has singularitiesand takes negative values at integer values of the Stokes observables. However,in experiments with `bright' many-photon states, the photon-number resolutionis typically smeared due to the technical limitations of contemporaryphotodetectors. This results in a PQPD that is positive and regular even forsuch strongly nonclassical states as single-photon seeded squeezed vacuum.  This problem can be solved by `highlighting' the quantum state, that is, byadding a strong coherent beam into the orthogonal polarization mode. Thisprocedure bridges polarization quantum tomography with the Wigner-functiontomography, while preserving the main advantage of the first one, namely,immunity to the common phase fluctuations in the light path. Thus, it providesa convenient method for the verification of bright nonclassical states oflight, such as squeezed Fock states.

Non-classical features of Polarization Quasi-Probability Distribution