A quantum dot has been used to detect a single excitation among the tens of thousands of atomic nuclear spins comprising it. This result is an important step towards treating nuclear spins as a quantum memory rather than a troublesome source of noise.
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Hilaire, P., Economou, S.E. Sensitive spin seeks single magnon. Nat. Phys. 17, 551–552 (2021). https://doi.org/10.1038/s41567-021-01176-5
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DOI: https://doi.org/10.1038/s41567-021-01176-5
