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

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 / τ . 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.

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Publication Details

Journal
Photonics Research
Published
2024-09-23
DOI
https://doi.org/10.1364/prj.539892
Citations
4
Primary Topic
Advanced Frequency and Time Standards
Type
article
Field-Weighted Citation Impact
1.35
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article

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

Yuan Yao, Yuan Qian, Yao Huang, Huaqing Zhang et al.
4 citations
Photonics Research
Advanced Frequency and Time Standards
1.35
article

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

Yuan Yao, Yuan Qian, Yao Huang, Huaqing Zhang, Haosen Shi, Ruming Hu, Hongfu Yu, Yige Lin, Tao Yang, Yanyi Jiang, Long-Sheng Ma, Zhanjun Fang, Hua Guan, Kelin Gao, BINGKUN LU
article en
4 citations

Abstract

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 / τ . 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.

Photonics ResearchVol. 12(11)
Chinese Academy of Sciences (CN), University of Chinese Academy of Sciences (CN), Wuhan Institute of Technology (CN), Tsinghua University (CN)
Affordable and clean energy
Openalex Percentile: Top 20%
Advanced Frequency and Time Standards
1.35
DOISourceOpenAlex
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Reducing statistical noise in frequency ratio measurement between Ca<sup>+</sup> and Sr optical clocks with a frequency-synthesized local oscillator from a Sr optical clock — Yuan Yao, Yuan Qian, et al. · Photonics Research (2024) | TGRS Research Map | TGRS