Two lutetium ion optical clocks achieve record precision of 10⁻¹⁹

Two independent ¹⁷⁶Lu⁺ single-ion optical clocks achieve fractional frequency uncertainties near 10⁻¹⁹.

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The fact

They agree at 5.7 × 10⁻¹⁹, pushing the boundaries of timekeeping precision.

This breakthrough could redefine frequency standards and enhance navigation systems.

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