Erlangen 2022 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 60: Quantum Information II
Q 60.14: Poster
Donnerstag, 17. März 2022, 16:30–18:30, P
Quantum Frequency Conversion of SnV-Resonant Photons to the Telecom C-Band — •David Lindler, Tobias Bauer, and Christoph Becher — Universität des Saarlandes, FR Physik, Campus E2.6, 66123 Saarbrücken
Quantum nodes such as Tin-Vacancy-Centers (SnV) in diamond store and distribute quantum information in quantum communication networks. 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 problem of high loss in fibers for SnV-resonant photons is solved by quantum frequency down-conversion of the photons into the low-loss telecom bands.
We here present a 2-step scheme for quantum frequency conversion of SnV-resonant photons to the telecom C-band based on difference frequency generation in PPLN waveguides. Due to pumping in the long wavelength regime, 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 step process 619 nm −1030.5 nm =1550 nm. We will present the characterization of key components as well as first results on wavelength stabilization of the the Cr2+:ZnS/Se pump laser, which is needed to avoid conversion-induced frequency fluctuations of the single photons.