Thorium nuclear clock stabilizes itself with feedback
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A prototype stayed stable beyond 24 hours.
Vienna's thorium nuclear clock held itself stable beyond 24 hours.
Nuclei absorbing laser light supplied the feedback that corrected laser drift.
The advance turns a nuclear transition into an automatic calibration reference, completing a feedback loop.
It still trails the best optical atomic clocks. Better lasers and crystals are next.
Original source published: Preprint, June 3, 2026, 23:15 Beijing / 11:15 AM EDT
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