Freiburg 2019 – wissenschaftliches Programm

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FM: Fall Meeting

FM 9: Quantum Networks: Platforms and Components I

FM 9.2: Talk

Montag, 23. September 2019, 14:15–14:30, 1098

Demonstration of ultra stable single quantum defects in silicon carbide nanophotonics structures — •Charles Babin, Timo Goerlitz, Naoya Moriaka, Roland Nagy, Rainer Stöhr, Matthias Niethammer, Yu-Chen Chen, Florian Kaiser, and Jörg Wrachtrup — 3rd Institute of Physics, University of Stuttgart and Institute for Quantum Science and Technology IQST, Germany

Solid state quantum systems with optically interfaced spins are promising platforms for quantum information processing. A scalable system should be insensitive to the environment, and emit a large fraction of photons resonantly. [1]. As we have recently shown, those criteria are met by the silicon vacancy center (VSi) in silicon carbide [2].

A remaining bottleneck is the low fluorescence rate, which is limited by a strong phonon coupling to a metastable state manifold. Further, the associated spin flip processes represent a limitation for the single shot readout fidelity. This talk addresses strategies to overcome these issues. I will show the first promising results on the stability of single defects inside nano-waveguide structures. This marks the first step toward the incorporation of single emitters in nano-photonics cavities to increase fluorescence rates via Purcell enhancement. I will also present a pathway to realize a deterministic readout of the electron spin via a nuclear spin memory [3].

[1] David D. Awschalom, Ronald Hanson, Jörg Wrachtrup & Brian B. Zhou, Nature Photonics 12, 516*527 (2018)

[2] R. Nagy & al., Nature Communications 10, 1954 (2019)

[3] P. Neuman& al., Science 329, 542*544 (2010)