ABSTRACT
Magnetic field detection technology has important applications in aerospace, military, medicine and many other fields, and is even the core symbol of the technical level in some fields. Therefore, how to continuously improve the performance of magnetometer has become an important scientific research direction. In principle, the ultimate measurement sensitivity of an atomic magnetometer will be limited by the quantum noise of atoms and light, so quantum squeezing of atomic spin or photon shot noise is an important method to improve the measurement sensitivity in principle. Magnetometers with high sensitivity are usually working with high-density atomic ensembles, therefore it is a challenge to apply or detect quantum-enhanced effect under strong interactions and significant atomic absorption effects. Here I will introduce our work on enhancing the performance of high-sensitivity Bell-Bloom-type atomic magnetometers through squeezed light [1], as well as the work on quantum noise analysis and suppression in atomic ensembles [2] within spin-exchange relaxation free (SERF) regime [3,4]. It will demonstrate the compatibility of quantum squeezing with atomic sensors and their potential advantages. [1] Charikleia Troullinou, Ricardo Jiménez-Martínez, Jia Kong, Vito Giovanni Lucivero, and Morgan W. Mitchell, Squeezed-Light Enhancement and Backaction Evasion in a High Sensitivity Optically Pumped Magnetometer, Physical Review Letters, 127(19) (2021). [2] Jia Kong, Yaping Feng, Yihan Wang, Qingwei Wang, and Xiao-Ming Lu, Physical Review Applied 24, 064001 (2025). [3] Jia Kong, Ricardo Jimenez-Martınez, Charikleia Troullinou, Vito Giovanni Lucivero, Géza Tóth, and Morgan W. Mitchell, Measurement-induced, spatially-extended entanglement in a hot, strongly-interacting atomic system, Nature Communications 11:2415 (2020).
BIOGRAPHY
Dr. Jia Kong is a professor at Hangzhou Dianzi University in Hangzhou, China. She received her Ph.D. from East China Normal University in 2015. Her research focuses on quantum-enhanced precision measurement with emphasis on macroscopic spin-entangled atoms, squeezed-light atomic magnetometer, and quantum-enhanced low-noise amplifiers and nonlinear interferometers. She has published more than 20 papers in physics journals, including Nature Communications and Physical Review Letters, with citations more than 1000 times. Some of the results have been selected as "Top Ten Optics Award" and "Quantum High Moments" in Physics World. She has been selected for Zhejiang Province Leading Talent Training Program, and was awarded the Innovation Program for Quantum Science and Technology Fund, the NFSC-Excellent Young Scientists Fund, and the EU Marie Curie Fund.
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