Protecting qubit coherence by spectrally engineered driving of the spin environment

Abstract Modern quantum technologies rely crucially on techniques to mitigate decoherence; these can be either passive, achieved for example via materials engineering, or active, typically pulsed monochromatic driving fields applied the qubit. Using a solid-state defect spin coupled microwave-driven bath, we experimentally demonstrate decoherence mitigation method based spectral engineering of environmental noise with polychromatic drive waveform, and show that it outperforms techniques. Results are in agreement quantitative modeling, open path active protection using custom-designed waveforms environment rather than