Freiburg 2024 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 38: Poster IV
Q 38.29: Poster
Wednesday, March 13, 2024, 17:00–19:00, KG I Foyer
Indistinguishable single photons from negatively charged tin-vacancy centres in diamond — •R. Morsch1, D. Herrmann1, J. Goerlitz1, B. Kambs1, P. Fuchs1, P.-O. Colard2, M. Markham2, and C. Becher1 — 1Fachrichtung 7.2, Universität des Saarlandes, Campus E2.6, 66123 Saarbrücken, Germany — 2Element Six Global Innovation Centre, Fermi Avenue, Harwell Oxford, Didcot, Oxfordshire, X11 0QR, UK
Within the field of quantum information processing (QIP) numerous schemes demand long-lived, stationary qubits, that can be controlled coherently and read out optically. Furthermore, a linear optics quantum computer inherently relies on the emission of single indistinguishable photons. The negatively charged tin-vacancy centre (SnV-) in diamond has made its mark as a promising candidate for these applications. Individually addressable spins with long coherence times as well as bright emission of single, close-to-transform limited photons render it a good light-matter interface. Moreover, recent studies point towards high achievable indistinguishabilities upon resonant excitation. Here we present our work on different excitation schemes for the generation of single indistinguishable photons emitted by SnV-centres: In off-resonant excitation we find the indistinguishability of the single photons to be limited due to the high excitation powers needed. We further evaluate different approaches for excitation within the SnV multi-level scheme and discuss their limitations. Eventually we report on the state of experiments on emission of indistinguishable single photons upon resonant excitation in a homebuilt cross-polarization setup.