Erlangen 2022 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 5: Quantum Technologies I

Q 5.3: Talk

Monday, March 14, 2022, 14:30–14:45, Q-H13

Successful nanophotonic integration of silicon vacancy colour centres in silicon carbide — •Florian Kaiser¹, Charles Babin¹, Rainer Stöhr¹, Naoya Morioka^1,2, Tobias Linkewitz¹, Timo Steidl¹, Raphael Wörnle¹, Di Liu¹, Erik Hesselmeier¹, Vadim Vorobyov¹, Andrej Denisenko¹, Mario Hentschel¹, Christian Gobert³, Patrick Berwian³, Georgy V Astakhov⁴, Wolfgang Knolle⁵, Sridhar Majety⁶, Saha Pranta⁶, Marina Radulaski⁶, Nguyen T Son⁷, Jawad Ul-Hassan⁷, and Jörg Wrachtrup¹ — ¹Universität Stuttgart — ²Kyoto University — ³IISB Erlangen — ⁴HDZI Dresden — ⁵IOM Leipzig — ⁶Davis University — ⁷Linköping University

We nanofabricate silicon vacancy (VSi) centres in silicon carbide (SiC) without degrading their good spin-optical properties. We show nearly lifetime limited optical lines and record spin coherence times for single defects generated via ion implantation and in SiC waveguides.

We show further controlled coupling to nearby nuclear spin qubits with fidelities of 95%. In this regard, VSi centres are unique central spins due to their high operation temperature (T=20 K). The high cooling powers of cryogenic equipment at these temperatures make it possible to directly control nuclear spins via radiofrequency drive.

This shows that VSi centres are prime candidates for developing next-generation quantum networks based on integrated quantum computational clusters with efficient spin-photon interfaces. We will also highlight how the electrical control capabilities offered by the semiconductor SiC platform will play a major role towards scalability.