Tunable synthetic spin-orbit coupling (SSOC) is one of the key challenges in various quantum systems, such as ultracold atomic gases, topological superconductors, and semiconductor quantum dots. Here we experimentally demonstrate controlling the SSOC by investigating the anisotropy of spin-valley resonance in a silicon quantum dot. As we rotate the applied magnetic field in plane, we find a striking nonsinusoidal behavior of resonance amplitude that distinguishes SSOC from the intrinsic spin-orbit coupling (ISOC), and associate this behavior with the previously overlooked in-plane transverse magnetic field gradient. Moreover, by theoretically analyzing the experimentally measured SSOC field, we predict the quality factor of the spin qubit could be optimized if the orientation of the in-plane magnetic field is rotated away from the traditional working point.

中文翻译：

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用磁场控制硅量子点中的合成自旋轨道耦合

可调谐合成自旋轨道耦合（SSOC）是各种量子系统（例如超冷原子气体，拓扑超导体和半导体量子点）中的关键挑战之一。在这里，我们通过研究硅量子点中自旋谷共振的各向异性来实验证明控制SSOC。当我们在平面上旋转施加的磁场时，我们发现了一个明显的共振振幅非正弦行为，该行为将SSOC与固有自旋轨道耦合（ISOC）区别开来，并将此行为与先前忽略的平面内横向磁场梯度相关联。此外，通过理论上分析实验测得的SSOC场，