期刊
PHYSICAL REVIEW LETTERS
卷 106, 期 15, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.106.157601
关键词
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资金
- Deutsche Forschungsgesellschaft [SFB/TR21, FOR 1482]
- European Commission
- Volkswagenstiftung
- Landesstiftung BW
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 (NV(0))]. Projective quantum nondemolition 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 (T(1) approximate to 90 ms and T(2) approximate to 6 mu s).
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