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Q: Fachverband Quantenoptik und Photonik

Q 38: Poster IV

Q 38.26: Poster

Wednesday, March 13, 2024, 17:00–19:00, KG I Foyer

Low Noise 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 represent a promising candidate for quantum nodes in quantum communication networks, that store, process and distribute quantum information [1,2]. To exchange the information between these nodes over long distances through optical fiber links, the spin state of the SnV-Center is transfered onto single photons. These photons are then 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. Scaling this to large networks requires a shared frequency reference frame to ensure, e.g, the indistinguishability of two converted photons from different nodes, when performing a Bell state measurement.

We here present a two-stage low noise 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 drastically reduces noise at the target wavelength compared to the single step process [3]. We will present the conversion efficiency, conversion-induced noise count rates, and initial results on the frequency stabilization of the mixing laser.
[1] J. Görlitz et al., npj Quant.Inf. 8, 45 (2022).
[2] R. Debroux et al., Phys. Rev. X 11, 041041 (2021).
[3] M. Schäfer et al., Adv Quantum Technol. 2300228 (2023).

Keywords: Quantum Frequency Conversion; Tin-Vacancy-Center