Ge hole spin control using acoustic waves

TL;DR

This paper demonstrates the numerical simulation of controlling germanium hole spin qubits with surface acoustic waves, highlighting the potential for acoustic-driven spin manipulation and spin-phonon coupling in quantum computing.

Contribution

It introduces a novel numerical approach to simulate acoustic control of Ge hole spins, revealing strain-induced g-tensor modulation and anisotropic Rabi frequencies.

Findings

Fast spin rotation achieved with small acoustic amplitudes

Strong anisotropy in Rabi frequency due to strain components

Foundations for acoustic-driven spin control in Ge hole qubits

Abstract

Germanium hole spin qubits based on strained Ge/SiGe quantum well have attracted much research attention due to the strong spin-orbit coupling. In particular, the strain dependence of the heavy-hole--light-hole mixing and thus the $g$-tensor anisotropy offer unique opportunities for acoustic driving and spin-phonon coupling. In this work we numerically simulate the coherent control of a Ge hole spin using surface acoustic waves. The periodic strain dynamically modulates the $g$-tensor matrix and causes fast spin rotation under a small acoustic amplitude. Moreover, we show a strong anisotropy and confinement dependence of the Rabi frequency coming from the phase-shifted longitudinal and shear strain components. Our work lays the foundations for acoustic-driven spin control and spin-phonon coupling using Ge hole spin qubits.