Year: 2021
Type: article
Abstract: 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.
Source: Applied Physics Letters
DOI: 10.1063/5.0045413
Authors: Christopher L. Morrison, Markus Rambach, Zhe Xian Koong, Francesco Graffitti, Fiona Thorburn, Ajoy K. Kar, Yong Ma, Suk-In Park, Jin Dong Song, Nick G. Stoltz, Dirk Bouwmeester, Alessandro Fedrizzi, Brian D. Gerardot
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Funders: Royal Academy of Engineering, Royal Society, Korea Institute of Science and Technology, Chongqing Research Program of Basic Research and Frontier Technology, Engineering and Physical Sciences Research Council, Institute for Information and Communications Technology Promotion, H2020 European Research Council
Awards: EPSRC Centre for Doctoral Training in Condensed Matter Physics: Renewal of the CM-DTC, G1947383137, G2505040309, UK Quantum Technology Hub for Quantum Communications Technologies, The EPSRC Quantum Communications Hub, QuigaByte-Gigahertz-clocked telecom cluster states for next generation quantum photonics, Two-dimensional Photonics Fabrication Facility, G6214581254, G6492608918, Two-dimensional quantum photonics, G840509978, G8606462628, G87932940
OpenAlex ID: W3121574600