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809 NIST Ion Clock Sets New Record for Most Accurate Clock in the World

Slashdot
msmash @ Slashdot · 07/15/2025 13:34 EDT

NIST Ion Clock Sets New Record for Most Accurate Clock in the World

NIST: There's a new record holder for the most accurate clock in the world. Researchers at the National Institute of Standards and Technology (NIST) have improved their atomic clock based on a trapped aluminum ion. Part of the latest wave of optical atomic clocks, it can perform timekeeping with 19 decimal places of accuracy.

Optical clocks are typically evaluated on two levels -- accuracy (how close a clock comes to measuring the ideal "true" time, also known as systematic uncertainty) and stability (how

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