Fig. 4: Rabi frequency and spin-orbit length.
From: Ultrafast coherent control of a hole spin qubit in a germanium quantum dot
a Linear dependence of Rabi frequency on the amplitude of applied driving field (i.e. Eac). Rescale of power is converted to amplitude (i.e. P1/2) by P (mW) = 10(P(dBm)-36)⁄10), P1/2 = (2 × P (mW) × 50 Ω)0.5. For P > 9 dBm, the data deviate from the linear dependence as a result of PAT effect (Supplementary Fig. 6c). Parameters for mode A are ax = 5 nm, ℏωy = 3 meV (energy splitting between the first excited state and ground state in Fig. 1b), g = 7, B = 100 mT; Parameters for mode B are ax = 5 nm, ℏωy = 3 meV, g = 3.95, B = 156 mT. Spin-orbit length of mode A and B are obtained to be 1.5 nm and 1.4 nm respectively, by fitting the Rabi frequency’s dependence on the square root of power using Eq. (2). b Rabi oscillations of mode A (B) at microwave power P = 9 dBm after subtracting the linear background are shown in the top (bottom) panel.
