High-fidelity spin and optical control of single silicon-vacancy centres in silicon carbide

Roland Nagy, Matthias Niethammer, Matthias Widmann, Yu-Chen Chen, Péter Udvarhelyi, Cristian Bonato, Jawad Ul Hassan, Robin Karhu, Ivan G. Ivanov, Nguyen Tien Son, Jeronimo R. Maze, Takeshi Ohshima, Öney O. Soykal, Ádám Gali, Sang-Yun Lee (), Florian Kaiser () and Jörg Wrachtrup
Additional contact information
Roland Nagy: University of Stuttgart and Institute for Quantum Science and Technology IQST
Matthias Niethammer: University of Stuttgart and Institute for Quantum Science and Technology IQST
Matthias Widmann: University of Stuttgart and Institute for Quantum Science and Technology IQST
Yu-Chen Chen: University of Stuttgart and Institute for Quantum Science and Technology IQST
Péter Udvarhelyi: Hungarian Academy of Sciences
Cristian Bonato: SUPA, Heriot-Watt University
Jawad Ul Hassan: Chemistry and Biology, Linköping University
Robin Karhu: Chemistry and Biology, Linköping University
Ivan G. Ivanov: Chemistry and Biology, Linköping University
Nguyen Tien Son: Chemistry and Biology, Linköping University
Jeronimo R. Maze: Pontificia Universidad Católica de Chile
Takeshi Ohshima: National Institutes for Quantum and Radiological Science and Technology
Öney O. Soykal: Naval Research Laboratory
Ádám Gali: Hungarian Academy of Sciences
Sang-Yun Lee: Korea Institute of Science and Technology
Florian Kaiser: University of Stuttgart and Institute for Quantum Science and Technology IQST
Jörg Wrachtrup: University of Stuttgart and Institute for Quantum Science and Technology IQST

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: Abstract Scalable quantum networking requires quantum systems with quantum processing capabilities. Solid state spin systems with reliable spin–optical interfaces are a leading hardware in this regard. However, available systems suffer from large electron–phonon interaction or fast spin dephasing. Here, we demonstrate that the negatively charged silicon-vacancy centre in silicon carbide is immune to both drawbacks. Thanks to its 4A2 symmetry in ground and excited states, optical resonances are stable with near-Fourier-transform-limited linewidths, allowing exploitation of the spin selectivity of the optical transitions. In combination with millisecond-long spin coherence times originating from the high-purity crystal, we demonstrate high-fidelity optical initialization and coherent spin control, which we exploit to show coherent coupling to single nuclear spins with ∼1 kHz resolution. The summary of our findings makes this defect a prime candidate for realising memory-assisted quantum network applications using semiconductor-based spin-to-photon interfaces and coherently coupled nuclear spins.

Date: 2019
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DOI: 10.1038/s41467-019-09873-9

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