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Metrology

Metrology

Optical link connects atomic clocks over 1400 km of fibre

22 Aug 2016 Hamish Johnston
Aerial photograph showing the PTB metrology laboratory in Germany
Well connected: PTB now has optical-clock links with two distant labs. (Courtesy: PTB)
The time kept by atomic clocks in France and Germany has been compared for the first time using a ne

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Hamish Johnston is an online editor of Physics World
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