Robust micro-magnet design for fast electrical manipulations of single spins in quantum dots

TL;DR

This paper introduces an optimized micromagnet design enabling rapid electrical manipulation of single spins in quantum dots, advancing spintronics and quantum information processing capabilities.

Contribution

The paper presents a novel micromagnet design scheme that enhances spin-rotation frequency and robustness against misalignment, validated through experimental implementation.

Findings

Achieved spin-rotation frequencies exceeding 50MHz in GaAs nanostructures.

Designed micromagnets with improved spatial field homogeneity and misalignment tolerance.

Validated the design through experiments demonstrating fast electrical spin control.

Abstract

Tailoring spin coupling to electric fields is central to spintronics and spin-based quantum information processing. We present an optimal micromagnet design that produces appropriate stray magnetic fields to mediate fast electrical spin manipulations in nanodevices. We quantify the practical requirements for spatial field inhomogeneity and tolerance for misalignment with spins, and propose a design scheme to improve the spin-rotation frequency (to exceed 50MHz in GaAs nanostructures). We then validate our design by experiments in separate devices. Our results will open a route to rapidly control solid-state electron spins with limited lifetimes and to study coherent spin dynamics in solids.