AI Article Synopsis
- - The study focuses on enhancing the performance of nitrogen-vacancy (NV) centers in diamond for quantum sensing, specifically their ability to detect direct current (dc) magnetic fields by improving the conditions under which these NV centers operate.
- - By controlling the P1 spin-bath and implementing a decoupling sequence, researchers achieve a significant increase in the coherence time (T) of the NV ensemble, allowing for better sensitivity in magnetic field measurements.
- - The results indicate that with these improved techniques, the NV-based sensors can achieve a magnetic field sensitivity of 1.2 nT μm Hz, showcasing the potential of engineered NVs for advanced magnetometry applications.
Article Abstract
The exquisite optical and spin properties of nitrogen-vacancy (NV) centers in diamond have made them a promising platform for quantum sensing. The prospect of NV-based sensors relies on the controlled production of these atomic-scale defects. Here we report on the fabrication of a preferentially oriented, shallow ensemble of NV centers and their applicability for sensing dc magnetic fields. For the present sample, the residual paramagnetic impurities are the dominant source of environmental noise, limiting the dephasing time (T) of the NVs. By controlling the P1 spin-bath, we achieve a 4-fold improvement in the T of the NV ensemble. Further, we show that combining spin-bath control and homonuclear decoupling sequence cancels NV-NV interactions and partially protects the sensors from a broader spin environment, thus extending the ensemble T up to 10 μs. With this decoupling protocol, we measure an improved dc magnetic field sensitivity of 1.2 nT μm Hz. Using engineered NVs and decoupling protocols, we demonstrate the prospects of harnessing the full potential of NV-based ensemble magnetometry.
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| http://dx.doi.org/10.1021/acs.nanolett.9b02993 | DOI Listing |
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