Absolute frequency measurement of the SrII optical lattice clock at NTSC using TAI for one year

Authors:
Open Access
Publisher website
Google Scholar
Abstract
We present a measurement of the absolute frequency of the | 5 s 2 1 S 0 ⟩ → | 5 s 5 p 3 P 0 ⟩ transition in the SrII optical lattice clock at National Time Service Center, performed using a frequency link to International Atomic Time to provide traceability to the International System of Units second. Spanning one-year period with a total oprational duration of approximately 2700 hours, the measurement yields an absolute frequency to be 429 228 004 229 872.95(7) Hz, corresponding to a relative frequency uncertainty of 1.6 × 10 − 16 . This result is in good agreement with the 2025 Bureau of Weights and Measures recommended frequency and is anticipated to contribute to the future update of the CIPM recommendation frequency of the secondary frequency standards.
Funding Information
  • the Operation and Maintenance of Major Scientific and Technological Infrastructure of the Chinese Academy of Sciences (2024000014)
  • the Innovation Program for Quantum Science and Technology (2021ZD0300902)
  • the Strategic Priority Research Program of the Chinese Academy of Sciences (XDB35010202)

This publication has 54 references indexed in Scilit: