Freiburg 2024 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 38: Poster IV

Q 38.30: Poster

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

Highly-automated quantum frequency conversion device for single photons from SnV centers in diamond — •Marlon Schäfer, David Lindler, Tobias Bauer, and Christoph Becher — Universität des Saarlandes, Fachrichtung Physik, Campus E2 6, 66123 Saarbrücken

Quantum frequency conversion of single photons to low-loss telecom bands is one of the key enabling technologies to distribute entanglement in fiber-linked quantum networks. However, in order to make this technology viable for real-world applications, quantum frequency converters must ensure robust 24/7 operation even outside of laboratory conditions and without human intervention.

Here, we investigate the employment of automation technology in quantum frequency converters aiming to increase robustness, stability and functionality. In particular automatic beam alignment and beam position stabilization are used to ensure long-time stable operation even under varying ambient conditions. We aim to automate a conversion process, where in two separate PPLN waveguides photons resonant with tin-vacancy (SnV) centers in diamond are first converted to an intermediate wavelength and then to the telecom C-band. Such a two-stage scheme was recently shown to successfully circumvent pump-induced noise for the conversion of single photons from silicon-vacancy centers to diamond [1].

[1] Schäfer, M. et al., Adv Quantum Technol. 2023, 2300228.

Keywords: quantum frequency conversion; nonlinear optics; color centers; tin-vacancy center in diamond; single photons