Efficient driving of a spin-qubit using single-atom magnets

TL;DR

This paper demonstrates how single-atom magnets can efficiently drive a nearby spin qubit through exchange coupling modulation, achieving high Rabi rates and advancing quantum control at the atomic scale.

Contribution

It reveals the primary driving mechanism for single-atom magnet-based qubits as exchange coupling modulation, providing insights for optimizing quantum control techniques.

Findings

Achieved Rabi rates in the tens of MHz range

Identified exchange coupling modulation as the main driving force

Provided guidelines for experimental parameter optimization

Abstract

The realization of electron-spin resonance at the single-atom level using scanning tunneling microscopy has opened new avenues for coherent quantum sensing and quantum state manipulation at the ultimate size limit. This allows to build many-body Hamiltonians and the study of their complex physical behavior. Recently, a novel qubit platform has emerged from this field, raising questions about the driving mechanism from single-atom magnets. In this work, we demonstrate how single-atom magnets can be used to drive a nearby single spin qubit efficiently. We show that the modulation of exchange coupling is the primary driving force, which successfully reproduces Rabi rates in the tens of MHz range, consistent with experimental data, while also addressing critical aspects related to the optimization of experimental parameters.