Multichannel highly sensitive diamond quantum magnetometer

We demonstrate a highly sensitive real-time magnetometry method at two measurement points. This magnetometry method is based on the frequency-division multiplexing of continuous-wave optically detected magnetic resonance. We use two ensembles of nitrogen-vacancy (NV) centers separated by 3.6 mm to measure a magnetic field. A different bias field is applied to the two NV ensembles to resolve the resonance peak for each ensemble in the frequency space and enables the multiplexed magnetometry at the two points. The sensitivities achieved at the measurement points are 21 and 22pT/Hz. The proposed magnetometry method can be expanded to include more measurement points and shorter spacing. The capability of real-time measurement at numerous points with short spacing and high sensitivity is beneficial for various applications, including biomagnetic sensing, geophysical research, and material science.

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Publication Details

Journal
Journal of Applied Physics
Published
2026-04-13
DOI
https://doi.org/10.1063/5.0303834
Primary Topic
Diamond and Carbon-based Materials Research
Type
article
Field-Weighted Citation Impact
0.00

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article

Multichannel highly sensitive diamond quantum magnetometer

Hiroshi Abe, Naota Sekiguchi, Shinobu Onoda, Mutsuko Hatano et al.
Journal of Applied Physics
Diamond and Carbon-based Materials Research
article

Multichannel highly sensitive diamond quantum magnetometer

Hiroshi Abe, Naota Sekiguchi, Shinobu Onoda, Mutsuko Hatano, Masashi Miyakawa, Takeshi Ohshima, Chikara Shinei, Takayuki Iwasaki, Tokuyuki Teraji, A. Yoshimura, T. Taniguchi, A. Kanamoto
article en

Abstract

We demonstrate a highly sensitive real-time magnetometry method at two measurement points. This magnetometry method is based on the frequency-division multiplexing of continuous-wave optically detected magnetic resonance. We use two ensembles of nitrogen-vacancy (NV) centers separated by 3.6 mm to measure a magnetic field. A different bias field is applied to the two NV ensembles to resolve the resonance peak for each ensemble in the frequency space and enables the multiplexed magnetometry at the two points. The sensitivities achieved at the measurement points are 21 and 22pT/Hz. The proposed magnetometry method can be expanded to include more measurement points and shorter spacing. The capability of real-time measurement at numerous points with short spacing and high sensitivity is beneficial for various applications, including biomagnetic sensing, geophysical research, and material science.

Journal of Applied PhysicsVol. 139(14)
Tokyo Institute of Technology (JP), University of Tsukuba (JP), Tohoku University (JP), National Institute for Materials Science (JP), Tsukuba University of Technology (JP), Tohoku University Hospital (JP), National Institutes for Quantum Science and Technology (JP), Institute of Science Tokyo (JP)
Ministry of Education, Culture, Sports, Science and Technology
Openalex Percentile: Top 22%
Diamond and Carbon-based Materials Research
DOIOpen Access PDFOpenAlex
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