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

Abstract

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).

4 pages, 3 figures

References in corpus (8)

• Universal dynamical decoupling of a single solid-state spin from a spin bath
• Scalable quantum register based on coupled electron spins in a room temperature solid
• Chemical control of the charge state of nitrogen-vacancy centers in diamond
• Chip-scale nanofabrication of single spins and spin arrays in diamond
• Surface-induced charge state conversion of nitrogen-vacancy defects in nanodiamonds
• Spin dynamics in the optical cycle of single nitrogen-vacancy centres in diamond
• Control and coherence of the optical transition of single defect centers in diamond
• Coherence and control of quantum registers based on electronic spin in a nuclear spin bath

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