TY - JOUR TI - A Bright Source of Telecom Single Photons Based on Quantum Frequency Conversion AU - Morrison, Christopher L. AU - Rambach, Markus AU - Koong, Zhe Xian AU - Graffitti, Francesco AU - Thorburn, Fiona AU - Kar, Ajoy K. AU - Ma, Yong AU - Park, Suk-In AU - Song, Jin Dong AU - Stoltz, Nick G. AU - Bouwmeester, Dirk AU - Fedrizzi, Alessandro AU - Gerardot, Brian D. T2 - Applied Physics Letters AB - 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. DA - 2021/01/27/ PY - 2021 DO - 10.1063/5.0045413 DP - Applied Physics Letters UR - https://doi.org/10.1063/5.0045413 Y2 - 2021/01/29/16:42:40 KW - Brian Gerardot KW - Condensed Matter - Mesoscale and Nanoscale Physics KW - QPL KW - Quantum Physics KW - Single photons ER -