Figure 2: ΔBz oscillations.
From: Suppressing qubit dephasing using real-time Hamiltonian estimation
(a) The pulse sequence used to estimate ΔBz. (b) Using nuclear feedback, ΔBz oscillations decay in a coherence time 
due to residual slow fluctuations in ΔBz. (c) The Ramsey sequence used to operate the S-T0 qubit in the rotating frame. (d) The Ramsey contrast (blue dots) decays in a characteristic time (solid line fit 
) similar to the oscillations in b due to the same residual slow fluctuations in ΔBz. (e) The Rabi pulse sequence used to drive the qubit in the rotating frame. (f) The rotating frame S−T0 qubit exhibits the typical behaviour when sweeping drive frequency and time (top). When driven on resonance (bottom), the qubit undergoes Rabi oscillations, demonstrating control in the rotating frame.
