A Pure and Indistinguishable Single-Photon Source at Telecommunication Wavelength

Da Lio, B. and Faurby, C. and Zhou, X. and Chan, M.L. and Uppu, R. and Thyrrestrup, H. and Scholz, S. and Wieck, A.D. and Ludwig, Ar. and Lodahl, P. and Midolo, L.

Volume: 5 Pages:
DOI: 10.1002/qute.202200006
Published: 2022

On-demand single-photon sources emitting pure and indistinguishable photons at the telecommunication wavelength are critical assets toward the deployment of fiber-based quantum networks. Indeed, single photons may serve as flying qubits, allowing communication of quantum information over long distances. Self-assembled InAs quantum dots embedded in GaAs constitute an excellent nearly deterministic source of high-quality single photons, but the vast majority of sources operate in the 900–950 nm wavelength range, precluding their adoption in a quantum network. A quantum frequency conversion scheme is presented here for converting single photons from quantum dots to the telecommunication C band, around 1550 nm, achieving 40.8% end-to-end efficiency, while maintaining both high purity and a high degree of indistinguishability during conversion with measured values of (Formula presented.) and (Formula presented.), respectively. © 2022 The Authors. Advanced Quantum Technologies published by Wiley-VCH GmbH.

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