High-sensitivity magnetometry based on quantum beats in diamond nitrogen-vacancy centers

Kejie Fang, Victor M. Acosta, Charles Santori, Zhihong Huang, Kohei M Itoh, Hideyuki Watanabe, Shinichi Shikata, Raymond G. Beausoleil

Research output: Contribution to journalArticle

61 Citations (Scopus)

Abstract

We demonstrate an absolute magnetometer based on quantum beats in the ground state of nitrogen-vacancy centers in diamond. We show that, by eliminating the dependence of spin evolution on the zero-field splitting D, the magnetometer is immune to temperature fluctuation and strain inhomogeneity. We apply this technique to measure low-frequency magnetic field noise by using a single nitrogen-vacancy center located within 500 nm of the surface of an isotopically pure (99.99% C12) diamond. The photon-shot-noise limited sensitivity achieves 38 nT/√Hz for 4.45 s acquisition time, a factor of √2 better than the implementation which uses only two spin levels. For long acquisition times (>10 s), we realize up to a factor of 15 improvement in magnetic sensitivity, which demonstrates the robustness of our technique against thermal drifts. Applying our technique to nitrogen-vacancy center ensembles, we eliminate dephasing from longitudinal strain inhomogeneity, resulting in a factor of 2.3 improvement in sensitivity.

Original languageEnglish
Article number130802
JournalPhysical Review Letters
Volume110
Issue number13
DOIs
Publication statusPublished - 2013 Mar 26

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magnetic measurement
synchronism
diamonds
nitrogen
magnetometers
sensitivity
acquisition
inhomogeneity
shot noise
low frequencies
ground state
photons
magnetic fields
temperature

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Fang, K., Acosta, V. M., Santori, C., Huang, Z., Itoh, K. M., Watanabe, H., ... Beausoleil, R. G. (2013). High-sensitivity magnetometry based on quantum beats in diamond nitrogen-vacancy centers. Physical Review Letters, 110(13), [130802]. https://doi.org/10.1103/PhysRevLett.110.130802

High-sensitivity magnetometry based on quantum beats in diamond nitrogen-vacancy centers. / Fang, Kejie; Acosta, Victor M.; Santori, Charles; Huang, Zhihong; Itoh, Kohei M; Watanabe, Hideyuki; Shikata, Shinichi; Beausoleil, Raymond G.

In: Physical Review Letters, Vol. 110, No. 13, 130802, 26.03.2013.

Research output: Contribution to journalArticle

Fang, K, Acosta, VM, Santori, C, Huang, Z, Itoh, KM, Watanabe, H, Shikata, S & Beausoleil, RG 2013, 'High-sensitivity magnetometry based on quantum beats in diamond nitrogen-vacancy centers', Physical Review Letters, vol. 110, no. 13, 130802. https://doi.org/10.1103/PhysRevLett.110.130802
Fang, Kejie ; Acosta, Victor M. ; Santori, Charles ; Huang, Zhihong ; Itoh, Kohei M ; Watanabe, Hideyuki ; Shikata, Shinichi ; Beausoleil, Raymond G. / High-sensitivity magnetometry based on quantum beats in diamond nitrogen-vacancy centers. In: Physical Review Letters. 2013 ; Vol. 110, No. 13.
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