PULSED QUADRATURE-PHASE SQUEEZING OF SOLITARY WAVES IN CHI((2)) PARAMETRIC WAVE-GUIDES

It is shown that coherent quantum simultons (simultaneous solitary wav es at two different frequencies) can undergo quadrature-phase squeezin g as they propagate through a dispersive chi((2)) waveguide. This requ ires a treatment of the coupled quantized fields including a quantized depleted pump field. A technique involving nonlinear stochastic parab olic partial differential equations using a nondiagonal coherent state representation in combination with an exact Wigner representation on a reduced phase space is outlined. We explicitly demonstrate that grou p-velocity matched chi((2)) waveguides which exhibit collinear propaga tion can produce quadrature-phase squeezed simultons. Quasi-phase-matc hed KTP waveguides, even with their large group-velocity mismatch betw een fundamental and second harmonic at 425 nm, can produce 3 dB squeez ed bright pulses at 850 nm in the large phase-mismatch regime. This ca n be improved to more than 6 dB by using group-velocity matched wavegu ides.