All papers · ⁸⁸Sr⁺ optical clock with 7.9×10⁻¹⁹ systematic uncertainty and measurement of its absolute frequency with 9.8×10⁻¹⁷ uncertainty
Fractional-frequency power spectral density $S_y(f)$ (1/Hz) of the hydrogen maser against Fourier frequency $f$ (Hz), log-log: measured against Sr$^+$ and against 5 d TAI (solid lines) and the modelled maser noise (dashed). Where the Sr$^+$ curve leaves the top of the printed frame it is broken, as in the print.
This panel was recovered from the published vector figure. The plot shown here is re-rendered for interactive viewing and analysis. See the paper for the original figure and full scientific context.
License: CC BY 4.0.
Phys. Rev. Appl. 24, 044082 (2025) · DOI: 10.1103/czlf-bfvp · arXiv: 2509.05964