Changhao Zhang

Single-beam atomic magnetometry with sub-nanotesla heading error based on hyperfine alignment resonances

Junlin Chen, Liwei Jiang, Jiaqi Yang, Changhao Zhang et autres

Abstract Heading error is a major limitation for resonance-based atomic magnetometers operating in the geomagnetic-field range, where the magnetic-field direction often changes with respect to the sensor. Here, we investigate the physical origin of heading error in a single-beam amplitude-modulated nonlinear magneto-optical …

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Enhancing atomic resonance of FM-NMOR magnetometers by manipulating hyperfine spectroscopy

Changhao Zhang, Liwei Jiang, Jiali Liu, Junlin Chen et autres

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Triaxial vector measurement of nonlinear magneto-optical rotation atomic magnetometer based on dual-frequency orthogonal magnetic modulation

Liwei Jiang, Jiaqi Yang, Junlin Chen, Changhao Zhang et autres

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Buffer-gas pressure dependence of the scale factor in nonlinear magneto-optical rotation magnetometers

Zhenglong Lu, J Liu, Chi Fang, X Zhao et autres

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In Situ Calibration of Three-Axis Magnetic-Field Coils Using Laser Polarization Control in Nonlinear Magneto-Optical Rotation Magnetometers

Zhenglong Lu, Jiali Liu, Chi Fang, Xin Zhao et autres

Abstract An in situ calibration method for three-axis magnetic field coils based on the transient response of a nonlinear magneto-optical rotation (NMOR) atomic ensemble is presented. The magnetic field is determined from the transient absorption signal by fitting the Larmor precession frequency. …

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Buffer-Gas Pressure Dependence of the Scale Factor in Nonlinear Magneto-Optical Rotation Magnetometers

Zhenglong Lu, Jiali Liu, Chi Fang, Xinyu Zhao et autres

Measurement of Relaxation Rates for NMOR Atomic Magnetometers Based on the Transient Dynamics

Zhenglong Lu, Jiali Liu, Xin Zhao, Yanchao Chai et autres

Abstract The relaxation rate is a fundamental parameter that characterizes the dynamics of atomic ensembles and plays a critical role in the performance of atomic magnetometers. In this study, a transient dynamics model for the NMOR magnetometer is developed based on multipole …

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Quantum sensing for electric current based on NMOR atomic magnetometer

Changhao Zhang, Liwei Jiang, Jiali Liu, Yuanqiang Chen et autres

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xMTF: A Formula-Free Model for Reinforcement-Learning-Based Multi-Task Fusion in Recommender Systems

Yang Hua Cao, Changhao Zhang, Xiaoshuang Chen, Kaiqiao Zhan et autres

Recommender systems need to optimize various types of user feedback, e.g., clicks, likes, and shares. A typical recommender system handling multiple types of feedback has two components: a multi-task learning (MTL) module, predicting feedback such as click-through rate and like rate; and …

In-situ magnetic field compensation for zero-field NMOR atomic magnetometer

Changhao Zhang, Jiali Liu, Xin Hui Zhao, Junlin Chen et autres

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Dead‐Zone‐Free NMOR Atomic Magnetometer Based on Excitation of Dual‐Axis Magnetic Pulse

Liwei Jiang, Changhao Zhang, Xin Hui Zhao, Jiali Liu et autres

Abstract Nonlinear magneto‐optical rotation (NMOR) atomic magnetometer has extreme precision and sensitivity. However, atomic magnetometer suffers from the problem of dead zone that the sensitive signal decays to zero if the magnetic field is along some specific directions relative to the sensor. …

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Model Predictive Control for Real-Time Stabilization of Magnetic Field Using NMOR Atomic Magnetometers

Liwei Jiang, Ximing Liu, Jiali Liu, Xin Hui Zhao et autres

Accurate calibration of atomic magnetometers and the detection of weak magnetic signals in applications such as biomagnetism and fundamental physics experiments are hindered by low-frequency environmental disturbances that mask useful signals. To address this, we implement a magnetic field reference source system …

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