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1 LNE - SYRTE - Laboratoire national de métrologie et d-essais - Systèmes de Référence Temps-Espace 2 LPL - Laboratoire de Physique des Lasers 3 KRISS - Korea Research Institute of Standards and Science Daejon 4 PTB - Physikalisch Technische Bundesanstalt 5 NPL - National Physical Laboratory Teddington

Abstract : Phase compensated optical fiber links enable high accuracy atomic clocks separated by thousands of kilometers to be compared with unprecedented statistical resolution. By searching for a daily variation of the frequency difference between four strontium optical lattice clocks in different locations throughout Europe connected by such links, we improve upon previous tests of time dilation predicted by special relativity. We obtain a constraint on the Robertson–Mansouri–Sexl parameter |α| 1.1 × 10 −8 quantifying a violation of time dilation, thus improving by a factor of around two the best known constraint obtained with Ives–Stilwell type experiments, and by two orders of magnitude the best constraint obtained by comparing atomic clocks. This work is the first of a new generation of tests of fundamental physics using optical clocks and fiber links. As clocks improve, and as fiber links are routinely operated, we expect that the tests initiated in this paper will improve by orders of magnitude in the near future.

Keywords : optical link special relativity optical clock

Author: P Delva - J Lodewyck - S Bilicki - E Bookjans - G Vallet - R Le Targat - P-E Pottie - C Guerlin - F Meynadier - C Le Poncin-Lafit

Source: https://hal.archives-ouvertes.fr/


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