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Developed and characterised for the first time is a quantum vector magnetometer using coherent population trapping (CPT) in 87Rb vapour and external magnetic field compensation by 3-axis Helmholtz coils to stabilize the amplitude and spectral position of the CPT resonance excited on a magneto-sensitive (mf ≠ 0) energy level transition. To measure the magnetic field components orthogonal to the magnetometer optical axis, resonance amplitude dependence upon the transverse field strength is used, which has a maximum at zero transverse field. The proposed approach allowed measurement of the external magnetic field vector with a sensitivity exceeding 500 pT/Hz1/2.
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V. Andryushkov, D. Radnatarov, S. Kobtsev, A. Dambuev, "Quantum vector magnetometer based on the CPT effect in 87Rb vapour," Proc. SPIE 11507, Quantum Communications and Quantum Imaging XVIII, 115070N (22 August 2020); https://doi.org/10.1117/12.2568340