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Metrology

Metrology

New optical timekeeper is 10 times more reliable than caesium atomic clocks

22 Oct 2019 Hamish Johnston
Atomic clock
Reliable ticker: physicists have created an all-optical atomic timekeeper. (Courtesy: iStock/Altayb)
A new timekeeper based on trapped strontium atoms accumulates an error of just 48 ps over 34 days o

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Hamish Johnston is an online editor of Physics World
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