Reducing statistical noise in frequency ratio measurement between Ca+and Sr optical clocks with a frequency-synthesized local oscillator from a Sr optical clock  

作　　者：HAOSEN SHI BINGKUN LU HUAQING ZHANG RUMING HU YUAN QIAN YAO HUANG TAO YANG YUAN YAO HONGFU YU ZHANJUN FANG KELIN GAO HUA GUAN YIGE LIN YANYI JIANG LONGSHENG MA 

机构地区：[1]State Key Laboratory of Precision Spectroscopy,East China Normal University,Shanghai 200062,China [2]Division of Time and Frequency Metrology,National Institute of Metrology,Beijing 100029,China [3]Key Laboratory of Atomic Frequency Standards,Innovation Academy for Precision Measurement Science and Technology,Chinese Academy of Sciences,Wuhan 430071,China [4]Key Laboratory of State Administration for Market Regulation(Time Frequency and Gravity Primary Standard),Beijing 100029,China [5]Innovation Academy for Precision Measurement Science and Technology,Chinese Academy of Sciences,Wuhan 430071,China [6]Department of Precision Instrument,Tsinghua University,Beijing 100084,China [7]University of Chinese Academy of Sciences,Beijing 100049,China [8]Wuhan Institute of Quantum Technology,Wuhan 430206,China

出　　处：《Photonics Research》2024年第11期2741-2746,共6页光子学研究(英文版)

基　　金：National Natural Science Foundation of China(11927810,11934014,12121004,12204494,12320101003,12334020,12304548);National Key Research and Development Program of China(2021YFF0603802,2022YFB3904001,2022YFB3904004);State Administration for Market Regulation(CXTD202301);Natural Science Foundation of Hubei Province(2022CFA013,2023EHA006);Youth Innovation Promotion Association of the Chinese Academy of Sciences(Y2022099);CAS Project for Young Scientists in Basic Research(YSBR-055,YSBR-085)。

摘　　要：Optical frequency ratio measurement between optical atomic clocks is essential to precision measurement as well as the redefinition of the second.Currently,the statistical noise in frequency ratio measurement of most ion clocks is limited by the frequency instability of ion clocks.In this work,we reduce the statistical noise in the frequency ratio measurement between a transportable Ca^(+)optical clock and a Sr optical lattice clock down to 2.2×10^(-15)∕√τp.The local oscillator of the Ca^(+)optical clock is frequency-synthesized from the Sr optical lattice clock,enabling a longer probe time for Ca^(+)clock transition.Compared to previous measurement using independent local oscillators,we achieve 10-fold reduction in comparison campaign duration.

关 键 词：optical noise RATIO 

分 类 号：TH7[机械工程—仪器科学与技术]