The spin of a photoluminescent nitrogen centre in diamond has a long life-time that could be useful as a qubit, for example. It's difficult enough to image such a single spin — imagine using that bright spin to detect nearby invisible 'dark' spins.
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Kennedy, T. Dark spins come to light. Nature Phys 1, 79–80 (2005). https://doi.org/10.1038/nphys159
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DOI: https://doi.org/10.1038/nphys159
