SAMOP 2023 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 39: Quantum Optics & Nano-Optics

Q 39.3: Vortrag

Mittwoch, 8. März 2023, 15:00–15:15, F342

Low-noise quantum frequency conversion of single photons from silicon-vacancy centers in diamond to the telecom C-band — •Marlon Schäfer, Benjamin Kambs, Tobias Bauer, Dennis Herrmann, David Lindler, and Christoph Becher — Universität des Saarlandes, Fachrichtung Physik, Campus E2 6, 66123 Saarbrücken

The vast majority of systems suitable as a quantum emitter for quantum communications show optical transitions in the visible or near infrared spectral region. Therefore, quantum frequency conversion (QFC) into low-loss telecom bands is the key enabling technology for long-range fiber-based quantum networks. Here, in addition to achieving high conversion efficiencies, the key issue is to minimize the conversion-induced noise photons in the target band. Especially conversion schemes that require a mixing wavelength in the vicinity of the target wavelength lead to high noise counts. A promising quantum emitter affected by this is the silicon-vacancy (SiV) center in diamond, where direct conversion to 1550 nm implies a mixing wavelength at 1405 nm, thus resulting in strong Raman and SPDC noise.

We present an efficient and low-noise QFC device converting SiV photons into telecom C-band. In a two-stage conversion process, the photons are first converted to an intermediate wavelength and then transduced to the target wavelength. This greatly increases the spectral distance between the mixing and the target wavelength, leading to very low noise rates of less than 1 photon/s/GHz. We discuss current limitations and applicability to other platforms such as SnV centers.