Bonn 2025 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

QI: Fachverband Quanteninformation

QI 37: Poster – Quantum Information Technologies (joint session Q/QI)

QI 37.11: Poster

Donnerstag, 13. März 2025, 17:00–19:00, Tent

Low Noise Quantum Frequency Conversion of Telecom Photons to SnV-Resonant Wavelengths — •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, featuring excellent optical and spin coherence [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 in the visible wavelength regime. After travelling trough the fiber, the reverse process, converting telecom photons back to the SnV-resonant wavelength, allows the photons to interact with another SnV-based quantum node once again.

We here present a two-stage low noise scheme for quantum frequency conversion of the telecom photons back to the SnV-resonant wavelength 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 initial results on the conversion efficiency, conversion-induced noise count rates and the frequency stabilization of the mixing laser.
[1] J. Görlitz et al., npj Quant. Inf. 8, 45 (2022).
[2] I. Karapatzakis et al., Phys. Rev. X 14, 031036 (2024).
[3] M. Schäfer et al., Adv Quantum Technol. 2300228 (2023).

Keywords: Quantum Frequency Conversion; Tin-Vacancy-Center