Erlangen 2022 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 53: Nano-Optics II
Q 53.2: Vortrag
Donnerstag, 17. März 2022, 14:15–14:30, Q-H11
Improving the purity of single photon emission from SnV− centers in diamond — •Philipp Fuchs1, Johannes Görlitz1, Michael Kieschnick2, Jan Meijer2, and Christoph Becher1 — 1Universität des Saarlandes, Fachrichtung Physik, Campus E2.6, 66123 Saarbrücken, Germany — 2Universität Leipzig, Angewandte Quantensysteme, Linnéstraße 5, 04103 Leipzig, Germany
Color centers in diamond have been demonstrated to be versatile systems that can be used as quantum sensors, long-living qubits, and single photon sources. However, their performance is often limited by imperfections from fabrication. For the negatively-charged tin vacancy center (SnV−) in diamond, we found the ion implantation in combination with the subsequent annealing to induce severe surface and subsurface damage, leading to strongly fluctuating background fluorescence. This uncorrelated fluorescence reproducibly limits the achievable single photon purity of SnV− centers created via ion implantation.
We demonstrate that a simple thermal oxidation process enables us to significantly reduce this damage and by this the background fluorescence, yielding a strongly enhanced single photon purity. We propose that the fluctuating background fluorescence originates from unoccupied surface states that become depleted after the thermal oxidation induces a proper surface termination. Finally, we distill all information from these and earlier experiments to a simple rate equation model, that helps gaining new insights into the charge stability and quantum efficiency of SnV− centers in diamond.