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October 3, 2025Open Access

^88Sr^+ optical clock with 7. 9 10^-19 systematic uncertainty and measurement of its absolute frequency with 9. 8 10^-17 uncertainty

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Authors

TLT. LindvallTFThomas FordellKHKalle Hanhijärvi

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Overview

$^{88}$Sr$^{+}$ optical clock reports systematic uncertainty of $7.9 imes 10^{-19}$, suggesting new benchmarks for atomic timekeeping.

Key Points

  • The optical clock achieved a systematic uncertainty of $7.9\times 10^{-19}$, marking a significant advancement in precision timekeeping.
  • Frequency measurements indicated a value of 444779044095485.49(15) Hz against a cesium fountain clock and a value of 444779044095485.373(44) Hz against TAI.
  • This analysis includes an evaluation of factors like blackbody radiation temperature and differential polarizability to reach low uncertainties.
  • The findings align with prior measurements, raising questions about the established frequency value recommended by the CIPM 2021.

Cite This Study

Lindvall et al. (2025) studied this question.

synapsesocial.com/papers/68e02f3cf0e39f13e7fa25fchttps://doi.org/10.1103/czlf-bfvp
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