Author(s): P. Jamonneau, G. Hétet, A. Dréau, J.-F. Roch, and V. Jacques
A dark state – a state that cannot emit or absorb photons – can be created by the hyperfine coupling of the electron spin of a single nitrogen-vacancy defect to a nearby C nuclear spin.

[Phys. Rev. Lett. 116, 043603] Published Tue Jan 26, 2016