title: Optical signatures of silicon-vacancy spins in diamond.
abstract: Colour centres in diamond have emerged as versatile tools for solid-state quantum technologies ranging from quantum information to metrology, where the nitrogen-vacancy centre is the most studied to date. Recently, this toolbox has expanded to include novel colour centres to realize more efficient spin-photon quantum interfaces. Of these, the silicon-vacancy centre stands out with highly desirable photonic properties. The challenge for utilizing this centre is to realize the hitherto elusive optical access to its electronic spin. Here we report spin-tagged resonance fluorescence from the negatively charged silicon-vacancy centre. Our measurements reveal a spin-state purity approaching unity in the excited state, highlighting the potential of the centre as an efficient spin-photon quantum interface.
authors.affiliation: 1] Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, UK [2].
authors.forename: Tina
authors.initials: T
authors.lastname: Müller
authors.affiliation: 1] Fachrichtung 7.2 (Experimentalphysik), Universität des Saarlandes, Campus E2.6, 66123 Saarbrücken, Germany [2].
authors.forename: Christian
authors.initials: C
authors.lastname: Hepp
authors.affiliation: Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, UK.
authors.forename: Benjamin
authors.initials: B
authors.lastname: Pingault
authors.affiliation: 1] Fachrichtung 7.2 (Experimentalphysik), Universität des Saarlandes, Campus E2.6, 66123 Saarbrücken, Germany [2] Departement Physik, Universität Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland.
authors.forename: Elke
authors.initials: E
authors.lastname: Neu
authors.affiliation: Experimentalphysik IV, Institut für Physik, Universität Augsburg, Universitätsstrasse 1 Nord, 86159 Augsburg, Germany.
authors.forename: Stefan
authors.initials: S
authors.lastname: Gsell
authors.affiliation: Experimentalphysik IV, Institut für Physik, Universität Augsburg, Universitätsstrasse 1 Nord, 86159 Augsburg, Germany.
authors.forename: Matthias
authors.initials: M
authors.lastname: Schreck
authors.affiliation: 1] DiaCoating GmbH, Mitterweg 24, 6020 Innsbruck, Austria [2] Fakultät für Physik, Technische Universität München, James-Franck-Strasse 1, 85748 Garching, Germany.
authors.forename: Hadwig
authors.initials: H
authors.lastname: Sternschulte
authors.affiliation: DiaCoating GmbH, Mitterweg 24, 6020 Innsbruck, Austria.
authors.forename: Doris
authors.initials: D
authors.lastname: Steinmüller-Nethl
authors.affiliation: Fachrichtung 7.2 (Experimentalphysik), Universität des Saarlandes, Campus E2.6, 66123 Saarbrücken, Germany.
authors.forename: Christoph
authors.initials: C
authors.lastname: Becher
authors.affiliation: Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, UK.
authors.forename: Mete
authors.initials: M
authors.lastname: Atatüre