Fig. 1: Coherence extension by driving the spin bath.
From: Protecting qubit coherence by spectrally engineered driving of the spin environment
a A shallow NV center (qubit) is dephased by the magnetic noise originating from a bath of surface spins. b Hahn-echo sequence used to measure coherence during bath driving with linewidth Δν and Rabi frequency Ωss. c Coherence decay without driving (gray), with monochromatic driving (blue) and polychromatic/stochastic driving (orange), described in the text. Solid lines are fits to \(\exp \left[-{(\tau /{T}_{2})}^{n}\right]\). Error bars correspond to ± one standard error of the mean.
