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. 2014 Sep 12;5:4870. doi: 10.1038/ncomms5870

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(a) Illustration of the unit cell of diamond including an NV colour centre. Spin projections m_s=0,±1 are defined with respect to the NV symmetry axis. (b) Energy levels of the triplet (left) and singlet states (right) of the NV centre and the applied excitation (EXC) and microwave (MW) fields and the detected fluorescence (FLUO). (c) Three-level V-scheme of the NV ground state triplet employed for the realization of the single-qubit holonomic quantum gate.