Extended Data Fig. 6: CPMG dynamical decoupling as a function of magnetic field strength.
From: Sweet-spot operation of a germanium hole spin qubit with highly anisotropic noise sensitivity
a, Schematic illustrating the power spectrum of noise assumed for the fitting. The spectrum consists of a 1/f charge noise component with a power S0,E at 1 Hz, plus a Gaussian spectral line at fGe-73 with width σGe-73 and power S0,hf. b–f, Normalized charge sensor signal Isensor for a CPMG sequence with 1 (b), 2 (c), 4 (d), 8 (e), and 16 (f) decoupling pulses respectively, as a function of the spacing between two subsequent decoupling pulses τ and B. Nτ is the total evolution time. ϕB = 0° and θB = 90°. The inset displays the fit to the data from which we extract γGe-73 = 1.48 MHz/T and σGe-73 = 17 kHz. The extracted charge-induced noise spectrum S0,E(B) is plotted in Extended Data Fig. 5f.
