Estimation of the detection efficiencies η1and η2 from Eq. 1 takes into account 0.14-dB/cm propagation losses calculated from the center of the periodically poled waveguides, a 0.5% loss introduced by the first directional coupler, 20% (for waveguide 1) and 14% (for waveguide 2) losses introduced by the pump filters DC2 and DC3, 13% Fresnel losses at the output facet, a 99% QE, and a 17-dB shot-noise clearance measured for a 4-mW LO power.

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