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Geodesy and metrology with a transportable optical clock

Abstract : Optical atomic clocks, due to their unprecedented stability and uncertainty, are already being used to test physical theories and herald a revision of the International System of Units. However, to unlock their potential for cross-disciplinary applications such as relativistic geodesy, a major challenge remains: their transformation from highly specialized instruments restricted to national metrology laboratories into flexible devices deployable in different locations. Here, we report the first field measurement campaign with a transportable $^{87}$Sr optical lattice clock. We use it to determine the gravity potential difference between the middle of a mountain and a location 90 km away, exploiting both local and remote clock comparisons to eliminate potential clock errors. A local comparison with a $^{171}$Yb lattice clock also serves as an important check on the international consistency of independently developed optical clocks. This campaign demonstrates the exciting prospects for transportable optical clocks.
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https://hal-cea.archives-ouvertes.fr/cea-01883759
Contributor : Bruno Savelli <>
Submitted on : Friday, September 28, 2018 - 4:03:26 PM
Last modification on : Friday, July 10, 2020 - 7:58:39 AM

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Jacopo Grotti, Silvio Koller, Stefan Vogt, Sebastian Häfner, Uwe Sterr, et al.. Geodesy and metrology with a transportable optical clock. Nature Physics, Nature Publishing Group, 2018, 14 (5), pp.437 - 441. ⟨10.1038/s41567-017-0042-3⟩. ⟨cea-01883759⟩

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