Mainz 2026 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 29: Poster – Quantum Technologies I

Q 29.9: Poster

Dienstag, 3. März 2026, 17:00–19:00, Philo 2. OG

Towards low noise and high efficient quantum frequency converters in TFLN — •Jonas Babai-Hemati, Ernst-Lukas Kuhlmann, Silia Babel, Laura Bollmers, Laura Padberg, Harald Herrmann, and Christine Silberhorn — Paderborn University, Integrated Quantum Optics, Institute for Photonic Quantum Systems (PhoQS), Warburger Str. 100, 33098 Paderborn, Germany

Quantum memories, such as tin-vacancy centers in diamond, play an essential role in realizing quantum protocols. To link the wavelengths of these memories to the telecom wavelength, compatible quantum frequency converters (QFCs) with high efficiency and low noise are needed. The thin-film lithium niobate (TFLN) platform exhibits outstanding potential in supporting such processes highly confined in waveguides. However, current TFLN structures still suffer from fabrication inhomogeneities, which decrease efficiency and spectrally broaden frequency conversion processes. A spectral broadening of unwanted noise processes can cause a spectral overlap of noise with a wanted process. We simulate a single-stage difference-frequency generation (DFG) in TFLN. This process converts tin-vacancy emission at 619 nm, pumped at 1030 nm, to the telecom C-band (1550 nm). We simulate the efficiency decrease from fabrication tolerances in critical parameters such as the periodic poling structure and waveguide geometry. We also investigate the spectral broadening of noise processes to identify which parameters most strongly contribute to noise in the simulated single-stage DFG System.

Keywords: TFLN; Quantum frequency converter; Fabrication tolerances