We demonstrate fast universal electrical spin manipulation with inhomogeneous magnetic fields. With fast Rabi frequency up to 127 MHz, we leave the conventional regime of strong nuclear-spin influence and observe a spin-flip fidelity > 96%, a distinct chevron Rabi pattern in the spectral-time domain, and spin resonance linewidth limited by the Rabi frequency, not by the dephasing rate. In addition, we establish fast z-rotations up to 54 MHz by directly controlling the spin phase. Our findings will significantly facilitate tomography and error correction with electron spins in quantum dots.
@article{arxiv.1411.6738,
title = {Fast Electrical Control of Single Electron Spins in Quantum Dots with Vanishing Influence from Nuclear Spins},
author = {J. Yoneda and T. Otsuka and T. Nakajima and T. Takakura and T. Obata and M. Pioro-Ladrière and H. Lu and C. Palmstrøm and A. C. Gossard and S. Tarucha},
journal= {arXiv preprint arXiv:1411.6738},
year = {2015}
}