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Q: Fachverband Quantenoptik und Photonik

Q 61: Quantum Optics (Miscellaneous)

Q 61.4: Poster

Thursday, March 17, 2022, 16:30–18:30, P

Nanophotonic fiber-coupled silicon carbide quantum interface — •Lukas Niechziol, Raphael Nold, Marcel Krumrein, Jonathan Körber, Izel Gediz, Jonas Zatsch, Florian Kaiser, and Jörg Wrachtrup — 3rd Institute of Physics, University of Stuttgart, 70569 Stuttgart, Germany

In the field of quantum sensing, quantum cryptography and quantum computing silicon vacancy centers in silicon carbide have recently quickened the interest of many research groups, due to its availability, spin configuration, integratabilty and more. Until now most publications focus on color centers in bulk material. This results in collecting efficiencies between 0.1% and 1%. In our experiment we will use waveguides with photonic crystal cavities to enhance the photon flux of the color centers. These photons will travel to a taper of the waveguide to be transferred to a tapered fiber. We used FTDT simulations to find optimal parameters for single-mode waveguide geometries as well as for the fiber. The simulation showed that the waveguides we plan to use achieve a transmission of a color center (dipole) of 42.4% into the desired TE fundamental mode of the waveguides. Additionally a transmission efficiency over the quantum interface of about 99.0% resulting in a total collecting efficiency of 41.9% of the light of a color center into a fiber. Our goal is to translate the results of our simulations towards highly efficient quantum interface including a photonic crystal cavity with a deposited color center.