Nature, Published online: 23 September 2026; doi:10.1038/s41586-026-11072-8
Two independent 176Lu+ single-ion optical clocks achieve fractional frequency uncertainties near 10−19 and agree at 5.7 × 10−19, advancing precision timekeeping.Lu<sup>+</sup> optical frequency references with accuracy verified at the 19th digit
Nature, Published online: 23 September 2026; doi:10.1038/s41586-026-11072-8Two independent 176Lu+ single-ion optical clocks achieve fractional frequency uncertainties near 10−19 and agree at 5.7 × 10−19, advancing precision timekeeping…