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Recently, a research team from the School of Communication and Information Engineering at Nanjing University of Posts and Telecommunications made a significant breakthrough in the development of diamond NV (nitrogen vacancy) center quantum magnetometers. The team, for the first time, used a diamond NV center solid-state quantum system to achieve quantum precision measurement in the magnetic field range of 0.01 T–1.5 T.
This innovative achievement has notable advantages of high spatial resolution and wide measurement range, holding important application value in cutting-edge fields such as industrial magnetic measurement, medical imaging equipment development, and integrated circuit testing. This breakthrough marks a solid step forward for China in the field of quantum magnetic measurement. In the era of quantum metrology, it supports the flattening of magnetic field metrology and is expected to provide more convenient services for advanced manufacturing industries. This technology provides a common supporting technology for quantitative microscopic measurement and analysis of high-end permanent magnets, which is significant for enhancing China's research and manufacturing capabilities of high-end magnetic materials.
The National Institute of Metrology, China, is one of the country's authoritative metrology institutions with broad influence in the metrology industry. The diamond NV center quantum magnetometer strictly follows the JJF1832-2020 magnetometer calibration standard and has undergone rigorous calibration by the National Institute of Metrology, ensuring the accuracy of measurement results. After PT2025 calibration, the magnetometer achieves an accuracy better than 13 ppm in the 1.0–1.5 T range. This level of precision is reported internationally for the first time and is comparable to the gold standard of magnetic field metrology—the Metrolab PT series nuclear magnetic resonance magnetometer. Unlike the PT series NMR magnetometer, which requires three different probes to cover the 0.05 T to 1.5 T range, the diamond NV center quantum magnetometer can cover a continuous magnetic field range from 0.01 T to 1.5 T with a single probe, greatly simplifying the measurement process and improving efficiency, while extending the measurement range of NMR magnetometers.
The diamond NV center quantum magnetometer achieves spatial resolution at the micrometer scale, whereas the probe size of the globally renowned Swiss Metrolab company's PT2025 nuclear magnetic resonance magnetometer is at the millimeter scale and has strict requirements for the gradient of the magnetic field under test, usually less than 1000 ppm/cm. Because the magnetic field-sensitive core material of the diamond NV center quantum magnetometer is only micrometers in size, it is expected to solve the problem of the lack of quantum metrology technology for large magnetic field gradients. The team has successfully realized self-referenced microscopic measurement of the surface magnetic field strength of a single cylindrical permanent magnet.
The quantum precision measurement team at Nanjing University of Posts and Telecommunications has long been engaged in research on quantum precision measurement methodologies and experimental system development, exploring applications of quantum precision measurement in chip testing, microscopic testing and characterization of magnetic materials, and magnetic field metrology. This achievement is one of the decades-long research accumulations of the university's Peter Grünberg Research Center scientific team and has received support from the National Key R&D Program and the Basic Strengthening Program's technology field fund.
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