A bright source of telecom single photons based on quantum frequency conversion

Christopher L. Morrison, Markus Rambach, Zhe Xian Koong, Francesco Graffitti, Fiona Thorburn, Ajoy Kumar Kar, Yong Ma, Suk In Park, Jin Dong Song, Nick G. Stoltz, Dirk Bouwmeester, Alessandro Fedrizzi, Brian D. Gerardot

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14 Citations (Scopus)
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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 fiber 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 fiber 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 ≃35%, demonstrate count rates approaching 1 MHz at 1550 nm with g(2)(0)=0.043(1), and achieve Hong-Ou-Mandel (HOM) visibilities of 60%. We expect this scheme to be preferable to quantum dot sources directly emitting at telecom wavelengths for fiber-based quantum networking.
Original languageEnglish
Article number174003
JournalApplied Physics Letters
Issue number17
Publication statusPublished - 26 Apr 2021

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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