Researchers at the Centre for Quantum Technologies (CQT) at the National University of Singapore have developed an atomic clock built from the element lutetium that sets a new standard for precision. The device measured its transition frequency to 19 decimal places, yielding an uncertainty of 1 × 10⁻¹⁹ — the lowest reported for any optical atomic clock to date. Highly resistant to environmental interference, the clock can detect gravitational time shifts across millimetre height differences, paving the way for redefining the second.

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