Fig. 4: Amplitude-dependent frequency modulation of the drive frequency.
From: Fast superconducting qubit control with subharmonic drives
a With the drive frequency following the ac-Stark shift of the transmon (red trace), a frequency chirped pulse is always resonant with the subharmonic process. Compared with fixed-frequency drive (blue trace), it avoids directly crossing other processes. b A power Rabi experiment with frequency chirping. The frequency axis here is the initial frequency of the pulse.
