Time and frequency

 Frequency Distribution

Frequency is the physical quantity that can be most precisely measured, and so is time, its inverse quantity. Many other physical quantities are linked to time, like for instance length, which is related to time by the vacuum speed of light. A major assignment of National Metrology Institutes is therefore providing accurate standards of the SI second. The vision of distributing time or frequency via optical fiber networks is now becoming reality.

Likewise, experiments in fundamental research and astronomy involve synchronization of remote frequency references and thus rely on stable optical links. Where fiber links are not practicable, the applications make use of free space transmission of a stable frequency. The technology enables new generation global satellite navigation systems (GNSS) and satellite geodesy, where they serve as a reference for free space optical communication links between satellites and ground-based apparatus such as telescopes or laser ranging system.

Menlo Expert Ben Sprenger 2019

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Frequency-Comb-Enabled Quantum 2.0 Applications

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