Dark States of Single Nitrogen-Vacancy Centers in Diamond Unraveled by Single Shot NMR
Dark States of Single Nitrogen-Vacancy Centers in Diamond Unraveled by Single Shot NMR
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DOI：
10.1103/physrevlett.106.157601
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发表时间：
2011-04-14
影响因子：
8.6
通讯作者：
Wrachtrup, J.
中科院分区：
文献类型：
--
作者：
Waldherr, G.;Beck, J.;Wrachtrup, J.
金刚石中的氮空位（NV）中心被认为是环境条件下量子计算和纳米级计量的基础。因此，准确了解其量子态至关重要。在这里，我们通过实验表明，在通常的操作条件下，NV 存在两种电荷状态的平衡状态 [70% 处于预期负电 (NV(-)) 状态，30% 处于中性电荷状态 (NV(0))]。氮核自旋的投影量子非破坏测量甚至可以检测附加的光学非活性状态。核自旋也可以在 NV0 中被一致驱动（T(1) 大约 90 ms，T(2) 大约 6 mu s）。
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).