Vienna and Beijing teams build world's first nuclear clocks
Teams at TU Wien and Tsinghua University independently built the first operating nuclear clocks using thorium-229 trapped in calcium fluoride crystals, reporting the results in Nature on 7 October 2026. The devices time laser interactions with the atomic nucleus rather than electron transitions and are not yet more accurate than the best atomic clocks. Potential uses include satellite navigation, data-transfer sync, surveying and metrology; the Vienna device already ran a dark-matter search at atomic-clock precision. Combining Vienna's crystals with Beijing's stronger laser could close the remaining performance gap.