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THU: Thursday Contributed Sessions
THU 13: Poster Session: Applications
THU 13.60: Poster
Thursday, September 11, 2025, 16:30–18:30, ZHG Foyer 1. OG
Interfacing Tin-Vacancy Centers in diamond and 40Ca+ Ions via Quantum Frequency Conversion — •David Lindler, Tobias Bauer, Pascal Baumgart, Max Bergerhoff, Marlon Schäfer, Jürgen Eschner, and Christoph Becher — Universität des Saarlandes, FR Physik, Campus E2.6, 66123 Saarbrücken
Quantum frequency conversion is an essential technique for integrating different quantum memories into a heterogeneous quantum network. It addresses the issue of high loss in optical fibers at visible and near-infrared wavelengths by converting the emitted photons from the various memories to a central wavelength within the low-loss telecom band. This process also serves to eliminate the frequency distinguishability between photons, enabling the distribution of entanglement via a Bell state measurement on photons originating from different quantum memories.
We present a combination of two quantum frequency converters based on difference frequency generation in PPLN waveguides, which convert photons from two quantum memories, such as Tin-Vacancy centers in diamond at 619 nm and 40Ca+ ions at 854 nm, to the telecom C-band. To minimize frequency mismatch, we employ a locking scheme that distributes a common frequency reference, generated by a frequency comb, to all lasers involved in the conversion process. We will present initial results on the conversion efficiency, conversion-induced noise count rates and the frequency stabilization of the lasers.
Keywords: Quantum Frequency Conversion; Tin-Vacancy-Center; Ca-Ions