The finding represents an early lead for the Chinese group in a precision-timekeeping race that opened only in 2024, when physicists first demonstrated direct laser excitation of a nuclear transition [1].
The device was built by a team affiliated with Tsinghua University and the Beijing Academy of Quantum Information Sciences, the report stated [2]. It uses the same low-energy transition in thorium-229 nuclei embedded in calcium fluoride crystals that the Vienna team employed, shifting the timing reference from the electron cloud to the atomic nucleus itself [3].
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