{"paper":{"title":"First international comparison of fountain primary frequency standards via a long distance optical fiber link","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.ins-det"],"primary_cat":"physics.atom-ph","authors_text":"(4), A. Amy-Klein (4), A. Kuhl (2), B. Lipphardt (2), C. Chardonnet (4), C. Grebing (2), D. Nicolodi (1), E. Camisard (5), F. Meynadier (1), F. Stefani (1), F. Wiotte (4), G. Grosche (2), G. Santarelli (6), H. Denker (3), J. Gu\\'ena (1), M. Abgrall (1), M. Lours (1), N. Chiodo (4), N. Quintin (4), O. Lopez (4), P. E. Pottie (1), P. Rosenbusch (1), R. Le Targat (1), S. Bize (1), S. Koke (2), S. M. F. Raupach (2), S. Weyers (2), V. Gerginov (2), Y. Le Coq (1)","submitted_at":"2017-03-02T19:56:19Z","abstract_excerpt":"We report on the first comparison of distant caesium fountain primary frequency standards (PFSs) via an optical fiber link. The 1415 km long optical link connects two PFSs at LNE-SYRTE (Laboratoire National de m\\'{e}trologie et d'Essais - SYst\\`{e}me de R\\'{e}f\\'{e}rences Temps-Espace) in Paris (France) with two at PTB (Physikalisch-Technische Bundesanstalt) in Braunschweig (Germany). For a long time, these PFSs have been major contributors to accuracy of the International Atomic Time (TAI), with stated accuracies of around $3\\times 10^{-16}$. They have also been the references for a number of"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1703.02892","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}