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Q: Fachverband Quantenoptik und Photonik
Q 72: Quantum Technologies – Color Centers II
Q 72.5: Talk
Friday, March 6, 2026, 12:00–12:15, P 5
Creation and theoretical modelling of highly indistinguishable single photons from tin-vacancy centers in diamond — •Robert Morsch1, Dennis Herrmann1, Benjamin Kambs1, Pierre-Olivier Colard2, Matthew Markham2, and Christoph Becher1 — 1Universität des Saarlandes, FR Physik, Campus E2.6, 66123 Saarbrücken — 2Element Six Global Innovation Centre, Fermi Avenue, Harwell Oxford, Didcot, Oxfordshire, X11 0QR, UK
In quantum information processing (QIP), various schemes require long-lived stationary qubits that allow coherent state-control, optical readout and on-demand generation of single indistinguishable photons. The tin-vacancy center (SnV−) in diamond is a promising solid-state candidate for these applications, combining an addressable, long-lived spin and bright, longterm-stable emission of single, transform-limited photons. However, achieving near-unity photon indistinguishability remains a significant challenge. In our work we investigate the indistinguishability of resonantly excited single SnV-photons. Employing a cascade of electro-optical modulators, we carve sub-nanosecond π-pulses with record-high extinction ratios from a resonant cw-laser. We efficiently suppress the residual laser in the detection path using a home-built cross-polarization setup and measure raw HOM-visibilities of >95%, being well on par with those of single emitters in leading solid-state platforms. Detailed theoretical modelling of our experiment confirms these values and reveals an even higher intrinsic degree of the photon indistinguishabily. Considering the SnV′s long-lived spin, these findings ultimately highlight the unique potential of our platform.
Keywords: Indistinguishable single Photons; SnV