1. Thomas Kennedy is in the Electronics Science and Technology Division, Naval Research Laboratory, Washington, DC, 20375 USA. e-mail: kennedy@bloch.nrl.navy.mil

Abstract

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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