Fig. 3: Scaling of spin coherence under dynamical decoupling.

a, Dynamic decoupling measurements with N_π refocusing pulses, where each measurement is fit to exp[−(t/T_DD)^α]. The measurement sequence is shown in the inset, where r is the reference readout, s is the signal readout and t is the pulse delay. b, Spin coherence time T_DD (purple triangles) as a function of the number of refocusing pulses N_π. The orange curve is fit to a power law, \(\sim {{N}_{\uppi }}^{\gamma }\). The data (purple triangles) are extracted from fits to the data shown here. The error bars indicate the 68% confidence interval. All the measurements are performed in the absence of applied magnetic field.