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Metrology

Metrology

Entangled aluminium ion is world’s best timekeeper

06 Jun 2019
Sam Brewer and ion chip
Time keeper: NIST’s Sam Brewer with a chip that is used to trap aluminium ions. (Courtesy: Hamish Johnston)
By confining single ions of aluminium and magnesium in an electric trap, cooling them to near absolu

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Edwin Cartlidge is a science writer based in Rome
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