Heralded single photons from a silicon nanophotonic chip

A highly nonlinear (γ≈3700/W·m) silicon coupled-resonator-optical-waveguide generated heralded single photons (g<sup>(2)</sup> (0) ≤ 0.19 ±0.03) and widely-spaced photon pairs with coincidences-to-accidentals ratio >;10 (cw) and >;23 (pulsed), and outperformed a 54× longer silicon nanophotonic waveguide.

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