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The Innovation Academy for Precision Measurement Science and Technology at the Chinese Academy of Sciences has announced a groundbreaking achievement: its trapped ion physics research team has successfully developed a second-generation, liquid-nitrogen-cooled calcium ion optical clock. This state-of-the-art optical clock boasts an impressive total system uncertainty of just 4.4E-19. To put this into perspective, its error margin is so minuscule that it would not exceed 1 second over a staggering continuous timing period of approximately 72 billion years. This remarkable feat positions it as the optical clock with the highest reported uncertainty metric currently known. The team's related research findings have been recently published in the esteemed international journal, Physical Review Letters.
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