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. 2020 May 20;11:2516. doi: 10.1038/s41467-020-16330-5

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© The Author(s) 2020, corrected publication 2021

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Fig. 2 — a Schematic set-up for HOM interference with two photons from a single h-V_Si centre in SiC. Two laser pulses excite the h-V_Si centre with a time delay δt = 48.7 ns. Consecutively emitted ZPL photons are sent to an unbalanced Mach–Zehnder interferometer. SNSPD and coincidence electronics are used to record the two-photon statistics at the output. b Two-photon coincidence counts as a function of the detection time delay between both SNSPDs. The strongly suppressed peak at zero time delay witnesses Hong–Ou–Mandel interference. The grey area between dashed lines symbolises the integration time window that is used for evaluating the interference contrast V₀ = 0.69 ± 0.02. A two-photon coincidence occurs approximately every 84 s. The results shown are raw data without any correction.