Fast Electrical Control of Single Electron Spins in Quantum Dots with Vanishing Influence from Nuclear Spins

TL;DR

This paper demonstrates rapid electrical control of single electron spins in quantum dots, achieving high fidelity and fast rotations with minimal influence from nuclear spins, advancing quantum information processing.

Contribution

It introduces a method for fast, high-fidelity electrical spin manipulation in quantum dots that reduces nuclear spin effects, enabling improved quantum control.

Findings

Rabi frequency up to 127 MHz achieved

Spin-flip fidelity exceeds 96%

Spin resonance linewidth limited by Rabi frequency

Abstract

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.