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THU, 24 SEPT · 98 ITEMS
"Lutetium optical clocks verified at the 19th decimal digit" — Nature (current) · Science & Medicine
optical clocks have been demonstrated to achieve a fractional uncertainty at the 19th decimal place (10⁻¹⁹), making them the most accurate atomic clocks ever built. A pair of these clocks, constructed by researchers in Singapore and reported in Nature, were cross-compared to verify precision that would lose only about one second over the age of the universe. The work represents a major milestone in optical timekeeping, pushing beyond the 18th decimal place that previous record-holders had reached.
The claim is backed by the peer-reviewed Nature paper (doi:10.1038/s41586-026-11072-8), the primary source. The EurekAlert release and the highlight both accurately reflect the paper's headline result. This is a solid, authoritative claim stemming directly from the published research.
The Nature paper was published on 23 September 2026, making this genuinely new research.