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Long-distance chronometric leveling with a portable optical clock
Jacopo Grotti (Physikalisch-Technische Bundesanstalt, Federal Institute For Materials Research and Testing), Ingo Nosske (Physikalisch-Technische Bundesanstalt, Federal Institute For Materials Research and Testing), Silvio Koller (Physikalisch-Technische Bundesanstalt, Federal Institute For Materials Research and Testing), Sofia Herbers (Physikalisch-Technische Bundesanstalt, Federal Institute For Materials Research and Testing), Heiner Denker (Leibniz University Hannover), Ludger Timmen (Leibniz University Hannover), Gulnara A. Vishnyakova (Max Planck Institute of Quantum Optics), Gesine Grosche (Physikalisch-Technische Bundesanstalt, Federal Institute For Materials Research and Testing), Thomas Waterholter (Physikalisch-Technische Bundesanstalt, Federal Institute For Materials Research and Testing), Alexander Kühl (Physikalisch-Technische Bundesanstalt, Federal Institute For Materials Research and Testing), Sebastian Koke (Physikalisch-Technische Bundesanstalt, Federal Institute For Materials Research and Testing), Erik Benkler (Physikalisch-Technische Bundesanstalt, Federal Institute For Materials Research and Testing), Michele Giunta (Menlo Systems (Germany), Max Planck Institute of Quantum Optics), Lothar Maisenbacher (Max Planck Institute of Quantum Optics), Arthur Matveev (Max Planck Institute of Quantum Optics), Sören Dörscher (Physikalisch-Technische Bundesanstalt, Federal Institute For Materials Research and Testing), R. Schwarz (Physikalisch-Technische Bundesanstalt, Federal Institute For Materials Research and Testing), Ali Al-Masoudi (Physikalisch-Technische Bundesanstalt, Federal Institute For Materials Research and Testing), Theodor W. Hänsch (Max Planck Institute of Quantum Optics), Thomas Udem (Max Planck Institute of Quantum Optics), Ronald Holzwarth (Menlo Systems (Germany), Max Planck Institute of Quantum Optics), Christian Lisdat (Physikalisch-Technische Bundesanstalt, Federal Institute For Materials Research and Testing)
Résumé : We have measured the geopotential difference between two locations separated by 457 km by comparison of two optical lattice clocks via an interferometric fiber link, utilizing the gravitational redshift of the clock transition frequency. The 87 Sr clocks have been compared side-by-side before and after one of the clocks was moved to the remote location. The chronometrically measured geopotential difference of 3918.1 ( 2.6 ) m 2 s − 2 agrees with an independent geodetic determination of 3915.88 ( 0.30 ) m 2 s − 2 . The uncertainty of the chronometric geopotential difference is equivalent to an uncertainty of 27 cm in height. Published by the American Physical Society 2024