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Q: Fachverband Quantenoptik und Photonik
Q 47: Quantum Information (Quantum Communication and Quantum Repeater)
Q 47.7: Talk
Thursday, March 17, 2022, 12:00–12:15, Q-H12
Indistinguishable single photons from negatively charged tin-vacancy centres in diamond — •R. Morsch1, J. Görlitz1, B. Kambs1, D. Herrmann1, P. Fuchs1, P.-O. Colard2, M. Markham2, and C. Becher1 — 1Universität des Saarlandes, Saarbrücken 66123, Germany — 2Element Six Global Innovation Centre, OX11 0QR, UK
For various applications in the field of quantum information processing (QIP) long-lived, stationary qubits are required that can be controlled coherently and read out optically. Quantum computing with linear optics (LOQC) moreover inherently relies on bright light-matter interfaces that provide single indistinguishable photons.
Colour centres in diamond have emerged as a promising candidate among solid state qubits. Recent experiments have shown that among those the negatively charged tin-vacancy centre (SnV−) exhibits both individually addressable spins with long coherence times and bright emission of single, close-to-transform limited photons.
By means of Hong-Ou-Mandel interferometry we here investigate the indistinguishability of single photons emitted by a single SnV-centre. We find high Hong-Ou-Mandel visibilities, being a direct measure for high indistinguishability of the single photons. We compare the experimental results with the predictions of a theoretical model and extract the magnitude of spectral diffusion potentially affecting single photon indistinguishability in the present system. Furthermore, we estimate the timescale of spectral diffusion by repeating the experiment with various delays between emission of the interfering photons.