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Q: Fachverband Quantenoptik und Photonik

Q 66: Poster – Quantum Technologies III

Q 66.5: Poster

Thursday, March 5, 2026, 17:00–19:00, Philo 2. OG

Quantum photonics using color centers in a diamond membrane coupled to a photonic structure — •Surena FATEMI^1,2, Jan Fait¹, Roy Konnoth Ancel², Christophe Couteau², and Christoph Becher¹ — ¹Fachrichtung Physik, Universität des Saarlandes, Saarbrücken, Germany — ²Université de Technologie de Troyes, Troyes, France

In recent years, color centers in wide band-gap materials have attracted significant attention due to their exceptional potential in quantum technologies. Among these, group-IV color centers in diamond stand out for their long spin coherence times and superior optical properties, including narrow emission lines, high spectral stability, and bright single-photon emission. A key challenge in developing quantum devices based on color centers is the inefficient photon out-coupling from diamond, resulting in low extraction rates. To address this limitation, we investigate group-IV color centers in diamond membranes integrated with TiO2-based photonic waveguides. Leveraging Finite Element Method simulations and Monte Carlo optimization, we refine membrane geometry, coupling interfaces, and waveguide design to enhance photon out-coupling and achieve high photon extraction rates, paving the way for practical, efficient quantum devices. We also present the fabrication process and initial investigations of these optimized structures.

Keywords: Tin-Vacancy; Single-Photon Source; Color Centers; Diamond; Nanofabrication