Abstract
Quantum interference of polarization states of light radiation is investigated using a Wigner-type (W) polarization quasiprobability function. Two examples of light states, having the form of a macroscopically distinguishable superposition of either coherent or Fock states with alternatively excited polarization modes, are considered. Interference phenomena are shown to be connected with a specific entanglement of quantum states (due to their 'mirror-like' forms) and to be characterized by a universal 'four-photon' periodicity parameter. These effects are well exhibited via the negativity of the polarization W function and can be observed in direct polarization measurements.
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