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Q: Fachverband Quantenoptik und Photonik
Q 66: Poster – Quantum Technologies III
Q 66.22: Poster
Donnerstag, 5. März 2026, 17:00–19:00, Philo 2. OG
Highly Indistinguishable Single Photons from Tin-Vacancy Centers in Diamond — •Dennis Herrmann1, Robert Morsch1, Detlef Rogalla2, Matthew Markham3, and Christoph Becher1 — 1Fachrichtung 7.2, Universität des Saarlandes, Campus E2.6, 66123 Saarbrücken, Germany — 2RUBION, Ruhr-Universität Bochum, Universitätsstraße 150, D-44801, Bochum, Germany — 3Element Six Global Innovation Centre, Fermi Avenue, Harwell Oxford, Didcot, Oxfordshire, OX11 0QR, UK
The tin-vacancy (SnV) center in diamond has emerged as a powerful platform for photonic quantum technologies offering bright and spectrally stable single-photon emission together with optically addressable spin states that reach coherence times of up to 10 ms under dynamical decoupling. By combining a cross-polarization excitation scheme with polarisation-based laser suppression exceeding seven orders of magnitude and driving the emitter with coherent 180 ps optical pulses, we demonstrate two-photon quantum interference of consecutively emitted, highly indistinguishable single photons on the C-transition. Under these conditions, we obtain raw Hong-Ou-Mandel visibility values above 95 % at photon generation rates up to 3000 Hz, together with raw single-photon purities below 0.02. These results represent a key advancement towards a functional spin-photon interface - an essential component for quantum repeaters, large-scale quantum networks, and photonic cluster-state generation.
Keywords: Tin-Vacancy Center in Diamond; Single-photon Source; Hong-Ou-Mandel Interference; Indistinguishability