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Multiphoton multimode polarization entanglement in parametric down-conversion

Gatti, Alessandra; Zambrini,, Roberta; San Miguel, Maxi; Lugiato, Luigi
Physical Review A 68, 053807 (1-17) (2003)

We study the quantum properties of the polarization of the light produced in type II spontaneous parametric down-conversion in the framework of a multi-mode model valid in any gain regime. We show that the the microscopic polarization entanglement of photon pairs survives in the high gain regime (multi-photon regime), in the form of nonclassical correlation of all the Stokes operators describing polarization degrees of freedom.