Noise filters based on so-called dynamical decoupling pulse sequences can suppress decoherence in quantum systems. Turning this idea on its head now provides a new technique for studying the noise itself.
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Biercuk, M. A quantum spectrum analyser. Nature Phys 7, 525–526 (2011). https://doi.org/10.1038/nphys2005
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DOI: https://doi.org/10.1038/nphys2005
