Evidence item

The excerpt directly reports individual systematic uncertainties of 1.1×10⁻¹⁹ and 1.4×10⁻¹⁹, with 9.6×10⁻²⁰ for their difference. MEASUREMENT

Authenticity UNVERIFIED · extraction UNVERIFIED · independence group none (unreviewed) · created seq 24923

Source: Optical clocks with accuracy validated at the 19th digit · locator {} · excerpt hash sha256:6c43e3ff689b9eea527bdfb41dbc15ada6795e7b9f6345a13ca170d71d65c83d

We report a comprehensive evaluation of all known sources of systematic uncertainty for two independent 176Lu+ single-ion optical references, finding total systematic uncertainty of 1.1×10−19 and 1.4×10−19 for the two individual systems and 9.6×10−20 for the difference.