Millimetre-wave generation with 18 zs Hz^−1/2 timing noise floor via Kerr optical frequency division

This dataset contains the source data underlying the figures presented in the associated manuscript. It includes the experimental data used to generate the phase-noise spectra, timing-noise measurements, frequency-stability measurements, and other quantitative results reported in the main and supplementary figures. The data are provided in machine-readable format and organized by figure to facilitate reproduction and independent analysis of the reported results.