Nagy, Roland Niethammer, Matthias Widmann, Matthias Chen, Yu-Chen Udvarhelyi, Peter Bonato, Cristian Hassan, Jawad Ui Karhu, Robin Ivanov, Ivan G. Nguyen Tien Son Maze, Jeronimo R. Ohshima, Takeshi Soykal, Oney O. Gali, Adam Lee, Sang-Yun Kaiser, Florian Wrachtrup, Joerg 2024-01-19T20:31:28Z 2024-01-19T20:31:28Z 2021-09-02 2019-04 2041-1723 https://pubs.kist.re.kr/handle/201004/120182 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 (4)A(2) 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 similar to 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. English Nature Publishing Group High-fidelity spin and optical control of single silicon-vacancy centres in silicon carbide Article 10.1038/s41467-019-09873-9 1 Nature Communications, v.10 Nature Communications 10 Y scie scopus 000465838600006 2-s2.0-85064900524 Multidisciplinary Sciences Science & Technology - Other Topics Article SOLID-STATE SPIN NUCLEAR-MAGNETIC-RESONANCE COHERENT CONTROL QUANTUM ENTANGLEMENT SPECTROSCOPY PHOTON QUBITS 6H 4H