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We describe a chip-scale, telecommunications-band frequency conversioninterface designed for low-noise operation at wavelengths desirable for commonsingle photon emitters. Four-wave mixing Bragg scattering in silicon nitridewaveguides is used to demonstrate frequency upconversion and downconversionbetween the 980 nm and 1550 nm wavelength regions, with signal-to-backgroundlevels >10 and conversion efficiency of approximately -60 dB at low continuouswave input pump powers (<50 mW). Finite element simulations and the split-stepFourier method indicate that increased input powers of approximately 10 W(produced by amplified nanosecond pulses, for example) will result in aconversion efficiency >25 % in existing geometries. Finally, we presentwaveguide designs that can be used to connect shorter wavelength (637 nm to 852nm) quantum emitters with 1550 nm.Comment: Final published version; some modifications in text and figures with  respect to origina

A chip-scale, telecommunications-band frequency conversion interface for quantum emitters