Spin defects in silicon carbide (SiC) have attracted much attentions in various quantum technologies. In this work, we study the optical manipulation of charge state and coherent control of multifold divacancy spins ensemble in SiC under resonant excitation. The results reveal that the resonantly excited divacancy ensemble counts have dozens of enhancements by repumping a higher-energy laser. Moreover, it has a similar optimal repump laser wavelength of around 670 nm for multiple divacancies. On the basis of this, the optically detected magnetic resonance (ODMR) experiment shows that repump lasers with different wavelengths do not affect the ODMR contrast and line width. In addition, the repump lasers also do not change the divacancy spins’ coherence times. The experiments pave the way for using the optimal repump excitation method for SiC-based quantum information processing and quantum sensing.

中文翻译：

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共振激发下碳化硅双空位自旋的光电荷态操纵

碳化硅（SiC）中的自旋缺陷在各种量子技术中引起了广泛关注。在这项工作中，我们研究了共振激发下 SiC 中电荷态的光学操纵和多重双空位自旋系综的相干控制。结果表明，通过重新泵送更高能量的激光，共振激发的双空位系综计数有数十种增强。此外，对于多个双空位，它具有大约 670 nm 的类似最佳再泵浦激光波长。在此基础上，光学检测磁共振（ODMR）实验表明，不同波长的再泵浦激光器不影响ODMR对比度和线宽。此外，再泵浦激光器也不改变双空位自旋的相干时间。