In semiconductor quantum dots, single electron spins are surrounded by a bath of nuclear spins. Controlling the nuclear magnetization is difficult, but two experiments now demonstrate locking of the average nuclear field to a particular value and narrowing of the nuclear randomness.
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Coish, W. Through locks to narrows. Nature Phys 5, 710–711 (2009). https://doi.org/10.1038/nphys1414
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DOI: https://doi.org/10.1038/nphys1414
