Extended Data Fig. 1: Hole effective g-factor comparison between qubits Q₃ and Q₄.

Blue (red) points are g-factors measured by EDSR of Q₃ (Q₄). Solid lines are the fitted g-factors using the g-matrix formalism presented in Methods and Supplementary Section 2. The g-factor configuration presented for the qubit Q₃ correspond to the left panel of Fig. 2. The tilt of the principal axes of the lobes with respect to the device axes is most likely due to inhomogeneous strains^14,24,25.