Browsing by Author "Nguyen Tien Son"

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    High-fidelity spin and optical control of single silicon-vacancy centres in silicon carbide
    (2019) 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
    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.