High-fidelity spin and optical control of single silicon-vacancy centres in silicon carbide
High-fidelity spin and optical control of single silicon-vacancy centres in silicon carbide
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DOI：
10.1038/s41467-019-09873-9
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发表时间：
2019-04-26
影响因子：
16.6
通讯作者：
Wrachtrup, Joerg
中科院分区：
文献类型：
--
作者：
Nagy, Roland;Niethammer, Matthias;Wrachtrup, Joerg
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退相。在这里，我们证明了碳化硅中带负电荷的硅空位中心对这两个缺点都是免疫的。由于基态和激发态的（4）A（2）对称性，光学共振在近傅立叶变换限制的线宽下是稳定的，允许利用光学跃迁的自旋选择性。结合毫秒长的自旋相干时间起源于高纯度晶体，我们展示了高保真光学初始化和相干自旋控制，我们利用它来显示相干耦合到单个核自旋类似于1 kHz的分辨率。我们的研究结果的总结使得这个缺陷成为使用基于自旋到光子接口和相干耦合核自旋实现存储器辅助量子网络应用的主要候选者。
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.