Abstract
Detection of weak magnetic fields with nanoscale spatial resolution is an outstanding problem in the biological and physical sciences1,2,3,4,5. For example, at a distance of 10 nm, the spin of a single electron produces a magnetic field of about 1 μT, and the corresponding field from a single proton is a few nanoteslas. A sensor able to detect such magnetic fields with nanometre spatial resolution would enable powerful applications, ranging from the detection of magnetic resonance signals from individual electron or nuclear spins in complex biological molecules5,6 to readout of classical or quantum bits of information encoded in an electron or nuclear spin memory7. Here we experimentally demonstrate an approach to such nanoscale magnetic sensing, using coherent manipulation of an individual electronic spin qubit associated with a nitrogen-vacancy impurity in diamond at room temperature8. Using an ultra-pure diamond sample, we achieve detection of 3 nT magnetic fields at kilohertz frequencies after 100 s of averaging. In addition, we demonstrate a sensitivity of 0.5 μT Hz-1/2 for a diamond nanocrystal with a diameter of 30 nm.
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Acknowledgements
We acknowledge A. Akimov, D. Budker, F. Jelezko, F. Koppens, A. Trifonov, P. Hemmer and J. Wratchtrup for many discussions and experimental assistance. This work was supported by the NSF, DARPA, the Packard Foundation and Harvard CNS.
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Supplementary Information
The file contains Supplementary Figure 1 with Legend, Supplementary Discussion and additional references. This file provides a comparison between the magnetometer presented in this paper and other state-of-the-art magnetometers as well as a discussion on implementing NV magnetometers as single spin detectors. (PDF 210 kb)
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Maze, J., Stanwix, P., Hodges, J. et al. Nanoscale magnetic sensing with an individual electronic spin in diamond. Nature 455, 644–647 (2008). https://doi.org/10.1038/nature07279
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DOI: https://doi.org/10.1038/nature07279
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