Freiburg 2019 – wissenschaftliches Programm

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FM: Fall Meeting

FM 84: Poster: Quantum Networks

FM 84.2: Poster

Donnerstag, 26. September 2019, 16:30–18:30, Tents

Production of nanostructures in silicon carbide and their influence on single defect centres — •Timo Görlitz, Charles Babin, Rainer Stöhr, Roman Kolesov, Vadim Vorobev, Matthias Niethammer, Naoya Morioka, Roland Nagy, Florian Kaiser, and Jörg Wrachtrup — 3rd Institute of Physics, University of Stuttgart, Germany

Recently, it was shown that single silicon vacancy centres (VSi) in 4H silicon carbide (SiC) are a promising platform for quantum information distribution [1]. The system combines unprecedented spin and spectral stability thanks to low spin-photon coupling and identical dipole moments in ground and excited state. The low photon count rates of the system represent the system’s remaining bottleneck, especially when considering quantum communication tasks. To overcome this issue, nanophotonics structures can be used that boost emission rates via Purcell enhancement and, at the same time, improve light collection efficiency. Here, we will show that VSi centres in SiC preserve excellent spin-optical properties in nanophotonics wave guide structures, which is a key requirement for any further advancements. We will then outline our advancements in our current research direction, i.e. the fabrication and characterization of VSi centres in circular Bragg grating cavities. Those structures provide both Purcell enhancement and better collection efficiency [2], and we will compare our theoretical consideration to the experimentally obtained results.

[1] R. Nagy et al., Nature Comm. 10, 1954 (2019)

[2] J. Liu et al., Nature Nano. 14, 586 (2019)

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