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THU: Thursday Contributed Sessions

THU 13: Poster Session: Applications

THU 13.66: Poster

Thursday, September 11, 2025, 16:30–18:30, ZHG Foyer 1. OG

Coherent optical spectroscopy on ensembles of tin-vacancy color centers in diamond — •Fabian Voltz, Anna Fuchs, Dennis Herrmann, 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 narrow optical emission lines. Whereas mostly single G4V centers are investigated as qubit systems, also dense ensembles show promising properties, e.g. ensembles of silicon-vacancy (SiV⁻) centers revealing strong light-matter interaction [1] and enabling applications such as Raman-based quantum memories, single-photon nonlinearities, and quantum sensing. As the tin-vacancy (SnV⁻) center exhibits longer spin coherence times at elevated temperatures (∼ 2 K) [2], we here strive to combine strong light-matter interaction in ensembles with longer spin coherence times. As a first step we investigate the spin coherence times of ensembles of SnV⁻ centers by coherent optical spectroscopy such as spectral hole burning (SHB) and coherent population trapping (CPT).

We will highlight our recent results on SnV⁻ ensembles and evaluate their suitability for quantum applications based on these findings.
[1] Weinzetl et al., Phys. Rev. Lett. 122, 063601 (2019)
[2] Görlitz et al., npj Quantum Inf 8, 45 (2022)

Keywords: Diamond; Color Centers; Ensembles; Tin-Vacancy; Spectral Hole Burning