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Two-mode interactions in DFB systems: polarization-squeezed light and QND measurements

The possibility of formation of polarization-squeezed light in the case of the interaction of two orthogonally polarized waves in the spatio-periodical Kerr medium is considered. It is shown that at the output of such a nonlinear medium fluctuations of one of the Stokes parameter can be less than ones incoherent state. For the first time a procedure of quantum nondemolition measurement (QND) of the Stokes parameters of light is offered and analyzed.