The isolation of qubits from noise sources, such as surrounding nuclear spins and spin–electric susceptibility^1,2,3,4, has enabled extensions of quantum coherence times in recent pivotal advances towards the concrete implementation of spin-based quantum computation. In fact, the possibility of achieving enhanced quantum coherence has been substantially doubted for nanostructures due to the characteristic high degree of background charge fluctuations^5,6,7. Still, a sizeable spin–electric coupling will be needed in realistic multiple-qubit systems to address single-spin and spin–spin manipulations^8,9,10. Here, we realize a single-electron spin qubit with an isotopically enriched phase coherence time (20 μs)^11,12 and fast electrical control speed (up to 30 MHz) mediated by extrinsic spin–electric coupling. Using rapid spin rotations, we reveal that the free-evolution dephasing is caused by charge noise—rather than conventional magnetic noise—as highlighted by a 1/f spectrum extended over seven decades of frequency. The qubit exhibits superior performance with single-qubit gate fidelities exceeding 99.9% on average, offering a promising route to large-scale spin-qubit systems with fault-tolerant controllability.

将量子位与噪声源（例如周围的核自旋和自旋电磁化率^1,2,3,4）隔离开来，使得在最近具体实现基于自旋的量子计算的关键进展中，可以扩展量子相干时间。实际上，由于特征性的高度背景电荷起伏^5,6,7，对于纳米结构而言，实现增强的量子相干性的可能性已经受到了很大的质疑。尽管如此，在现实的多量子位系统中仍需要大量的自旋-电耦合，以解决单旋和自旋-旋操作^8,9,10。在这里，我们实现了具有同位素富集的相干时间（20μs）^11,12的单电子自旋量子位外在自旋-电耦合介导的快速电控制速度（高达30 MHz）。使用快速自旋旋转，我们发现自由进化的相移是由电荷噪声而不是传统的磁噪声引起的，正如扩展到七十个频率的1 / f频谱所突出的那样。量子比特具有优越的性能，平均单量子比特的门保真度超过99.9％，这为具有容错可控性的大规模自旋量子比特系统提供了一条有希望的途径。