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The nuclear optical clock functions by harnessing lasers to precisely manipulate the unique radioactive isotope known as 'thorium-229', facilitating nuclear energy level transitions. This frequency then serves as a benchmark for timekeeping. Leveraging their self-developed 148-nanometer continuous-wave vacuum ultraviolet laser and thorium-229-doped calcium fluoride crystals, Chinese scientists have achieved a groundbreaking feat by pioneering the successful development of a nuclear optical clock that operates stably on the global stage. This innovation extends the frontiers of quantum precision measurement, transitioning from electronic to nuclear transitions. The findings were published online in the esteemed journal Nature on the evening of October 7.
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