Modern quantum technologies rely crucially on techniques to mitigate quantum decoherence. These techniques can be either passive, achieved for example via materials engineering, or active, typically achieved via pulsed monochromatic driving fields applied to the qubit.
Using a solid-state defect spin coupled to a microwave-driven spin bath, a team of reserarchers has experimentally demonstrated a decoherence mitigation method based on spectral engineering of the environmental noise with a polychromatic drive waveform, and showed that it outperforms monochromatic techniques.
Results are in agreement with quantitative modeling, and open the path to active decoherence protection using custom-designed waveforms applied to the environment rather than the qubit.
The paper has been published in npj Quantum Information.
