QST Seminar - Noise Correlation and Uncertainty of Atomic Fountain Clocks Venue
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Atomic fountain clocks are currently the highest frequency standards. Uncertainty evaluation is the most important research work for fountain clocks and is crucial for improving their performance. This report presents our uncertainty evaluation study of fountains based on noise correlation. We studied the correlation algorithms of atomic clock noise and applied them to two scenarios. Firstly, we evaluated the influence of environmental noise on atomic clock signals by measuring the effects of magnetic fields and cold atom collision shift, achieving a testing accuracy of 10-17. Secondly, we investigated the contribution of different units to noise during the generation and transmission of frequency signals. This method not only measures the influence of noise on stability but also achieves frequency signal synchronization through cross-correlation, enabling delay measurements far below the sampling time. This method of extracting noise time information through correlation has important potential applications in the field of precision measurements.
Rong Wei is a researcher and doctoral supervisor at the Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences. He is engaged in research in the fields of laser cooling of cold atomic microwave clocks, time-frequency metrology, and precision measurement physics related to cold atoms. He developed the first domestic 87Rb fountain clock and has made important research achievements in fields such as cold atom magnetometry, atomic clock error evaluation, high-precision time-frequency applications, and preliminary research on space clocks. He has long served as the leader of the fountain research team and has undertaken more than 10 research projects funded by the National Natural Science Foundation of China, the Chinese Academy of Sciences, the Shanghai Municipal Government, and JK, accumulating nearly 10 million yuan in funding. He has also served as a reviewer for national and provincial projects and awards, such as the National Natural Science Foundation of China and the Ministry of Science and Technology's key research and development program. During his research, he has trained 9 graduate students, many of whom have received honors such as national scholarships, and has also cultivated talents for projects such as space clocks. He has published a translated book and has authored or co-authored over 40 papers in prestigious journals such as APL, OL, PRA, and JOSAB. He has also applied for and been granted more than 10 patents and serves as a reviewer for relevant journals.