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Laboratory setup for producing wavelength degenerate correlated-photon pairs at . Pump laser aligned for type I phase matching through two PPLN downconverting crystals. The correlated pairs are sent through a nonpolarizing beam splitter for coincidence detection.
A plot of the coincidence rate as a function of the delay between SSPD photoresponse and the gating signal of the InGaAs APD. The central peak is larger than the side peaks indicating correlated-photon pair production. The central peak height corresponds to and the side peak height corresponds to defined in the text. The inset shows a Gaussian fit to a zoom in of the central peak.
The detection coincidence rate as a function of system clock frequency for multiple detector technologies. The dotted line is for a pair of measured InGaAs APDs, the dashed curve is for the measured SSPD/APD pair, and the dot-dash curve is for the best reported SSPD characteristics (Ref. 9). Measured coincidence rates for APD/APD clocked operation at (⋆) and for SSPD/APD heralded operation at (●) are shown.
The dots are measurements of the contrast of the center peak to the side peaks (as shown in Fig. 2) as a function of the power from the pump laser. Equation (1) is plotted as a solid line using the measured parameters from the experiment.
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