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On-demand indistinguishable single photon sources are essential for quantumnetworking and communication. Semiconductor quantum dots are among the mostpromising candidates, but their typical emission wavelength renders themunsuitable for use in fibre networks. Here, we present quantum frequencyconversion of near-infrared photons from a bright quantum dot to thetelecommunication C-band, allowing integration with existing fibrearchitectures. We use a custom-built, tunable 2400 nm seed laser to convertsingle photons from 942 nm to 1550 nm in a difference frequency generationprocess. We achieve an end-to-end conversion efficiency of $\sim$35%,demonstrate count rates approaching 1 MHz at 1550 nm with$g^{\left(2\right)}\left(0\right) = 0.04$, and achieve Hong-Ou-Mandelvisibilities of 60%. We expect this scheme to be preferable to quantum dotsources directly emitting at telecom wavelengths for fibre based quantumnetworking.

A Bright Source of Telecom Single Photons Based on Quantum Frequency Conversion