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THU: Thursday Contributed Sessions
THU 13: Poster Session: Applications
THU 13.58: Poster
Thursday, September 11, 2025, 16:30–18:30, ZHG Foyer 1. OG
Generation of Highly Indistinguishable Single Photons from Tin-Vacancy Centers in Diamond — •Dennis Herrmann, Robert Morsch, and Christoph Becher — Fachrichtung 7.2, Universität des Saarlandes, Campus E2.6, 66123 Saarbrücken, Germany
The tin-vacancy (SnV) center in diamond is a promising platform for photonic quantum technologies, combining bright, spectrally stable single-photon emission with optically accessible spin states exhibiting coherence times of up to 10 ms under dynamical decoupling [1,2,3].
Here, we demonstrate two photon quantum interference of highly indistinguishable single photons consecutively emitted into a fine structure transition of the SnV center. Using 180 ps optical π-pulses with high extinction ratio and a cross-polarization excitation/detection scheme, we achieve polarization-based suppression of resonant laser light by more than 5 × 106. We observe raw Hong-Ou-Mandel visibilities exceeding 95 % at photon rates of up to 3000 Hz and single-photon purities of g2(0) < 0.02.
These results represent a significant step towards the realization of a spin-photon interface, a crucial component for quantum repeaters, scalable quantum networks and the generation of cluster states.
[1] New J. Phys. 22, 013048 (2020)
[2] npj Quantum Inf 8, 45(2022)
[3] Phys. Rev. X 14, 031036 (2024)