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 sup4/supAsub2/sub 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.
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机译:可扩展的量子网络需要具有量子处理能力的量子系统。在这方面,具有可靠的自旋光学接口的固态自旋系统是领先的硬件。然而,可用的系统遭受大的电子-声子相互作用或快速自旋相移的困扰。在这里,我们证明了碳化硅中带负电荷的硅空位中心不受两个缺点的影响。由于其在基态和激发态中的 4 sup> A 2 sub>对称性,光共振在近傅里叶变换限制的线宽下是稳定的,从而允许利用自旋选择性。光学跃迁。结合源于高纯度晶体的毫秒级自旋相干时间,我们演示了高保真光学初始化和相干自旋控制,我们利用这些方法显示了与〜1kHz分辨率的单核自旋的相干耦合。我们的发现的总结使该缺陷成为使用基于半导体的自旋至光子界面和相干耦合的核自旋实现内存辅助量子网络应用的主要候选者。
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