Fig. 2: Measurement of the hole g-tensor.
From: Sweet-spot operation of a germanium hole spin qubit with highly anisotropic noise sensitivity

a–c,e–g, Cross-section of \({\overleftrightarrow{g}}\) of Q1 (a–c) and Q2 (e–g) in the x–y plane (a,e), x–z plane (b,f) and y–z plane (c,g) of the magnet frame. Dots indicate measurements of g* and the solid line corresponds to the fit of \({\overleftrightarrow{g}}\). Exemplary resonance spectra used to extract \({\overleftrightarrow{g}}\) are plotted in Supplementary Fig. 1. d, Diagram indicating the zyz Euler rotation angles ϕ, θ and ζ of the principle g-tensor axes gx′, gy′ and gz′. The approximate crystal directions are indicated in square brackets. h, Overview of the three zyz Euler angles ϕ, θ and ζ for the rotation of a g-tensor with principle components gx′, gy′ and gz′ for Q1 and Q2.