Researchers of the National Measurement Institute VSL in Delft and the VU University Amsterdam managed to synchronise a clock of the Nikhef, the National Institute for Subatomic Physics, in Amsterdam with the atomic clock of VSL in Delft. The synchronisation took place via a 135 km long optical fibre link using the so-called White Rabbit protocol. This protocol allows clocks to be synchronised with the caesium clocks at VSL. The precise synchronisation between Delft and Amsterdam is a first step. In the future, this technique should be available throughout the Netherlands.

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