Dark states of single NV centers in diamond unraveled by single shot NMR

Details Dark states of single NV centers in diamond unraveled by single shot NMR Dark states of single NV centers in diamond unraveled by single shot NMR

2010-12-22

arxiv.org/abs/1012.5017v2

Physics

Quantum Physics

4 pages, 3 figures

Scientific paper

The nitrogen-vacancy (NV) center in diamond is supposed to be a building block for quantum computing and nanometer scale metrology at ambient conditions. Therefore, precise knowledge of its quantum states is crucial. Here, we experimentally show that under usual operating conditions the NV exists in an equilibrium of two charge states (70% in the expected negative (NV-) and 30% in the neutral one (NV0)). Projective quantum non-demolition measurement of the nitrogen nuclear spin enables the detection even of the additional, optically inactive state. The nuclear spin can be coherently driven also in NV0 (T1 ~ 90 ms and T2 ~ 6 micro-s).

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