SAMOP 2023 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 43: QI Poster II (joint session QI/Q)

Q 43.44: Poster

Wednesday, March 8, 2023, 16:30–19:00, Empore Lichthof

Two Stage Quantum Frequency Conversion of SnV-Resonant Photons to the Telecom C-Band — •David Lindler, Tobias Bauer, Marlon Schäfer, and Christoph Becher — Universität des Saarlandes, FR Physik, Campus E2.6, 66123 Saarbrücken

Tin-Vacancy-Centers (SnV) in diamond are a promising candidate for Quantum Nodes in quantum communication networks that store and distribute quantum information [1,2]. Transferring the spin state of the SnV-Center onto single photons enables the exchange of information between these nodes over long distances through optical fiber links. The photons are converted into the low-loss telecom bands via quantum frequency down-conversion, to avoid the problem of high loss in fibers for SnV-resonant photons at 619 nm.

We here present a two-stage scheme for quantum frequency conversion of SnV-resonant photons to the telecom C-band based on difference frequency generation in PPLN waveguides. The two step process 619 nm −2061 nm =885 nm, 885 nm −2061 nm =1550 nm drastically reduces noise at the target wavelength compared to the single stage process 619 nm −1030.5 nm =1550 nm, due to pumping in the long wavelength regime. We will present the characterization of key components as well as first results on conversion efficiency and conversion induced noise count rates.
[1] J. Görlitz et al., npj Quant.Inf. 8, 45 (2022).
[2] R. Debroux et al., Phys. Rev. X 11, 041041 (2021).