The bright Einstein-Podolsky-Rosen(EPR) beam (with quantum correlations between the quadrature-phase amplitudes of the spatially separated signals and the idler beams), and the bright two-mode quadrature squeezed light have been experimentally generated from a cw nondegenerate optical parametric amplifier (NOPA) injected by seed wave with degenerate frequency but orthogonal polarization.

A new analytical solution for the phase-mismatched Fokker-Planck equation of degenerate parametric amplification, and its application in evaluation of the amplitude quantum fluctuation after passing through the quasi-phase-matching(QPM) device is presented.

Optimum realization of the EPR paradox in the non-degenerate parametric amplification system;