Frontiers in Physics (Aug 2022)

Traceability of optical frequency to SI second via UTC(NIM)

  • Yuzhuo Wang,
  • Yige Lin,
  • Yuan Gao,
  • Aimin Zhang

DOI
https://doi.org/10.3389/fphy.2022.970450
Journal volume & issue
Vol. 10

Abstract

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Absolute frequency measurement of an optical clock is a milestone towards the redefinition of second in the International System of Units. This work summarizes briefly the measurement of frequency ratio between an optical clock and the second, applying the frequency comparison link from UTC(NIM) to International Atomic Time. Some strategies and suggestions are proposed to reduce the uncertainty introduced by the measurement system and dead time, which guided the frequency measurement of three optical clocks at 10−16 level in the past 3 years.

Keywords