Ding Shiqian

Associate professor, Department of Physics, Tsinghua University

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First thorium nuclear clocks begin ticking in Vienna and Beijing

Leads the Chinese team that built one of the first two nuclear clocks

For 70 years, the world's most precise clocks have counted the vibrations of electrons orbiting an atom. In early October 2026, two teams — one in Vienna, one in Beijing — unveiled the first clocks that read time from the ticking of a thorium nucleus instead.

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