  On-demand indistinguishable single photon sources are essential for quantum
networking and communication. Semiconductor quantum dots are among the most
promising candidates, but their typical emission wavelength renders them
unsuitable for use in fibre networks. Here, we present quantum frequency
conversion of near-infrared photons from a bright quantum dot to the
telecommunication C-band, allowing integration with existing fibre
architectures. We use a custom-built, tunable 2400 nm seed laser to convert
single photons from 942 nm to 1550 nm in a difference frequency generation
process. 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-Mandel
visibilities of 60%. We expect this scheme to be preferable to quantum dot
sources directly emitting at telecom wavelengths for fibre based quantum
networking.
