首页|Magnetic field stabilization system designed for the cold-atom coherent population-trapping clock
Magnetic field stabilization system designed for the cold-atom coherent population-trapping clock
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Accurate control of magnetic fields is crucial for cold-atom experiments,often necessitating custom-designed control systems due to limitations in commercially available power supplies.Here,we demonstrate precise and flexible control of a static magnetic field by employing a field-programmable gate array and a feedback loop.This setup enables us to maintain exceptionally stable current with a fractional stability of 1 ppm within 30 s.The error signal of the feedback loop exhibited a noise level of 10-5 A·Hz-1/2 for control bandwidths below 10 kHz.Utilizing this precise magnetic field control system,we investigate the second-order Zeeman shift in the context of cold-atom coherent population-trapping(CPT)clocks.Our analysis reveals the second-order Zeeman coefficient to be 574.21 Hz/G2,with an uncertainty of 1.36 Hz/G2.Consequently,the magnetic field stabilization system we developed allows us to achieve a second-order Zeeman shift below 10-14,surpassing the long-term stability of current cold-atom CPT clocks.
cold-atom coherent population-trapping clockZeeman coefficientmagnetic field stabilization system
詹畅、马翥、吴嘉涛、李懋捷、韩成银、鹿博、李朝红
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Laboratory of Quantum Engineering and Quantum Metrology,School of Physics and Astronomy,Sun Yat-sen University(Zhuhai Campus),Zhuhai 519082,China
Institute of Quantum Precision Measurement,State Key Laboratory of Radio Frequency Heterogeneous Integration,Shenzhen University,Shenzhen 518060,China
College of Physics and Optoelectronic Engineering,Shenzhen University,Shenzhen 518060,China
Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area(Guangdong),Shenzhen 518045,China
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National Key Research and Development Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of China
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