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Q: Fachverband Quantenoptik und Photonik

Q 66: Poster – Quantum Technologies III

Q 66.10: Poster

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

Time-resolved coherent optical spectroscopy on an ensemble of tin-vacancy color centers in diamond — •Fabian Voltz, Anna Fuchs, and Christoph Becher — Universität des Saarlandes, Saarbrücken 66123, Germany

Single negatively charged group IV-vacancy (G4V) color centers in diamond are among the leading candidates for qubit systems in quantum communication due to their long spin coherence times and stable optical emission lines. While most studies focus on single centers, dense ensembles of G4V centers offer enhanced light-matter coupling, as shown for ensembles of silicon-vacancy (SiV⁻) centers [1], enabling applications such as Raman-based quantum memories or quantum sensing.

Among the G4V centers, single tin-vacancy (SnV⁻) centers stand out with long spin coherence times at elevated temperatures (∼ 2 K) [2,3]. However the spin dynamics of ensembles of SnV⁻ centers remain largely unexplored, despite the potential benefits of higher signal levels.

In this work, we investigate the spin coherence time of a dense SnV⁻ ensemble by combining coherent optical spectroscopy with time-resolved measurements. We will present our recent results on SnV⁻ ensembles and discuss the implications of these findings for ensemble-based quantum technologies that aim to combine strong light-matter interaction with long spin coherence.

[1] Weinzetl et al., Phys. Rev. Lett. 122, 063601 (2019)

[2] Karapatzakis et al., Phys. Rev. X 14, 031036 (2024)

[3] Görlitz et al., npj Quantum Inf 8, 45 (2022)

Keywords: Diamond; Color Centers; Ensembles; Tin-Vacancy; Coherence Times