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Metrology

Metrology

Optical clocks hit the road

20 Feb 2017
Photographs of the PTB clock and the trailer that houses it
On the road: the PTB optical clock. (Courtesy: S B Koller et al. / Phys. Rev. Lett.)
Two independent groups of physicists in Germany and China have built portable optical clocks that ar

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Edwin Cartlidge is a science writer based in Rome
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