Freiburg 2024 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 30: Color Centers I
Q 30.4: Talk
Wednesday, March 13, 2024, 11:45–12:00, HS 3118
Waveguide-coupled single photon source in silicon carbide — •Marcel Krumrein1, Raphael Nold1, Flavie Davidson-Marquis2, Arthur Bourama1, Erik Hesselmeier1, Ruoming Peng1, Lukas Niechziol1, Di Liu1, Rainer Stöhr1, Patrick Berwian3, Jawad Ul-Hassan4, Florian Kaiser2, and Jörg Wrachtrup1 — 13rd Institute of Physics, University of Stuttgart, Germany — 2MRT Department, Luxembourg Institute of Science and Technology, Luxembourg — 3Fraunhofer Institute for Integrated Systems and Device Technology IISB, Germany — 4Department of Physics, Chemistry and Biology, Linköping Unversity, Sweden
Spin defects in silicon carbide are promising quantum emitters for quantum information applications. The silicon vacancies V1 and V2 in 4H-SiC possess very promising spin-optical properties, as lifetime-limited emission and a rich nuclear spin bath. However, the collection efficiency of bulk emitters is very poor, leading to low photon count rates, and thus, long measurement times. To address this, we integrate V2 defects into single mode nanobeams [1] and collect the emitted photons by tapered fibers [2]. Here, we present the characterization of the waveguide-fiber interface experimentally and theoretically with coupling efficiencies exceeding 93%. Using this interface, the emission of waveguide-integrated, single V2 centers was proven with saturated photon count rates of 181 kcps. Finally, we perform Rabi and Hahn-Echo sequences to show the accessibility of the defect's spin.
[1] C. Babin et al., Nat. Mater. 21, 67 (2022). [2] M. J. Burek et al., Phys. Rev. Applied 8, 024026 (2017).
Keywords: silicon carbide; defects in solid states; waveguide coupling; tapered optical fibers; single photon source