The spin-orbit interaction in spin qubits enables spin-flip transitions, resulting in Rabi oscillations when an external microwave field is resonant with the qubit frequency. Here, we introduce an alternative driving mechanism of hole spin qubits, where a far-detuned oscillating field couples to the qubit phase. Phase driving at radio frequencies, orders of magnitude slower than the microwave qubit frequency, induces highly non-trivial spin dynamics, violating the Rabi resonance condition. By using a qubit integrated in a silicon fin field-effect transistor (Si FinFET), we demonstrate a controllable suppression of resonant Rabi oscillations, and their revivals at tunable sidebands. These sidebands enable alternative qubit control schemes using global fields and local far-detuned pulses, facilitating the design of dense large-scale qubit architectures with local qubit addressability. Phase driving also decouples Rabi oscillations from noise, an effect due to a gapped Floquet spectrum and can enable Floquet engineering high-fidelity gates in future quantum processors.
@article{arxiv.2303.03350,
title = {Phase driving hole spin qubits},
author = {Stefano Bosco and Simon Geyer and Leon C. Camenzind and Rafael S. Eggli and Andreas Fuhrer and Richard J. Warburton and Dominik M. Zumbühl and J. Carlos Egues and Andreas V. Kuhlmann and Daniel Loss},
journal= {arXiv preprint arXiv:2303.03350},
year = {2023}
}