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Best Clock Ever: Timekeeper Based on Lutetium Atoms Wows Researchers

The device posted a systematic uncertainty of 1.2 x 10-19 after researchers compared two identical clocks to verify its accuracy.

Summary by Nature
Nature, Published online: 23 September 2026; doi:10.1038/d41586-026-03019-wThe device is a step towards redefining the second using a new generation of ultra-accurate timepieces.

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Researchers in Singapore have built an atomic clock that, according to their measurements, is more accurate than any other atomic clock in the world. The clock at the Centre for Quantum Technologies at the National University of Singapore operates with a single charged atom of the metal lutetium and deviates by a second only after 300 billion years.

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Time measurement at the limit: Researchers in Singapore have built two optical atomic clocks from individual Lutetium ions, whose systematic relative uncertainty is only about 1 × 10−19. In direct comparison, the independent systems agreed after 200 hours of measurement up to 5.7 × 10−19. Thus, the evaluated uncertainty is four times lower than the previous record values. Singapore (Singapore). Atom clocks [...] Die Beitrag Lutetium-Atomuhr sets…

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Nature broke the news in London, United Kingdom on Wednesday, September 23, 2026.
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