Fig. 1: Qubit energy splitting noise.
From: Low-frequency spin qubit energy splitting noise in highly purified 28Si/SiGe
a Colored scanning electron micrograph of a sample similar to the one used in this work. b Measurement of Ramsey fringes. The spin-up probability P↑ is recorded as a function of the resonance detuning ΔfMW. Each point corresponds to 100 single-shot measurements. The position of the spin resonance is indicated by the dashed red line. c Time evolution of the Ramsey fringe pattern during a measurement time t = 67 h. The white solid line tracks the resonance detuning Δf extracted from the fringes. d PSD S(f) of the qubit detuning calculated from the data shown in panel (c). Error bars in panel (b) denote standard error.
