In Vienna and Beijing, the first (thorium) nuclear clocks begin to tick

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Summary

Researchers in Vienna and Beijing have begun operating the world's first nuclear clocks based on a thorium-229 nuclear isomer, a breakthrough promising unprecedented timekeeping precision and new tests of fundamental physics.

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An educational explainer from NIST describing how atomic clocks work, why atoms provide extremely stable timekeeping, and the role of quantum physics and light in measuring time.