Mainz 2017 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 31: Poster: Quantum Optics and Photonics I

Q 31.53: Poster

Dienstag, 7. März 2017, 17:00–19:00, P OG1+2

Towards quantum optical experiments with silicon vacancy color centers in diamond at millikelvin temperatures — •David Groß, Jonas Nils Becker, Carsten Arend, Pavel Bushev, and Christoph Becher — Fakultät NT (FR Physik), Universität des Saarlandes, Campus E2.6, 66123 Saarbrücken, Germany

The search for a solid state spin-photon-interface for quantum communication applications allowing for efficient entanglement generation as well as long distance communication is a challenging task. Showing very narrow-band emission and all-optical coherent control, the silicon vacancy center (SiV) in diamond is a promising candidate for such an interface. However, the ground state coherence time of the SiV is limited to 35-45 ns by phonon-mediated processes, whereas pure spin-relaxation times in the millisecond regime have been reported. Therefore, by supressing phonon-induced decoherence, large spin coherence times can potentially be reached, rendering the SiV an ideal system for efficient long-distance quantum communication. We here present design and first experiments with a confocal microscope setup placed in a dilution refrigerator allowing full optical access at temperatures in the mK range. This enables the measurement of the SiV’s coherence properties beyond the phonon limited regime and potentially paves the way for future quantum information processing experiments using SiV centers requiring long coherence time scales.