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Telecommunications-band heralded single photons from a silicon nanophotonic chip
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, e-print arXiv:1108.5299
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29.Raw coincidences Craw are counted over a 512 ps bin at zero time delay between the C–band and L–band paths. Raw accidentals (Araw) are taken as the average over thirty separate 512 ps bins at time delays of , corresponding to the 1 MHz trigger rate, with coincidences due to dark counts D determined in the same way. The uncertainties in Araw and D are one standard deviation values and are propagated to generate the error bars in the CAR plot.
30.Coincidence and accidental rates at the CROW output are determined by taking the measured values and accounting for detector efficiency, filter losses, and output coupling loss from the CROW into the lensed fiber.
32. NAB and NAC are given by the average detection rates on SPADs B and C multiplied by the integration time, respectively. NA is the average photon detection rate on SPAD A mutiplied by the integration time. The one standard deviation uncertainties on these values are propagated to generate the error bars in Fig. 2(b).
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We demonstrate room temperature heralded single photon generation in a CMOS-compatible siliconnanophotonic device. The strong modal confinement and slow group velocity provided by a coupled resonatoroptical waveguide produced a large four-wave-mixing nonlinearity coefficient W−1 m−1 at telecommunications wavelengths. Spontaneous four-wave-mixing using a degenerate pump beam at 1549.6 nm created photon pairs at 1529.5 nm and 1570.5 nm with a coincidence-to-accidental ratio exceeding 20. A photon correlation measurement of the signal (1529.5 nm) photons heralded by the detection of the idler (1570.5 nm) photons showed antibunching with . The demonstration of a single photon source within a silicon platform holds promise for future integrated quantum photonic circuits.
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