{"paper":{"title":"The QTF-Backbone: Proposal for a Nationwide Optical Fibre Backbone in Germany for Quantum Technology and Time and Frequency Metrology","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["physics.atom-ph","physics.geo-ph","quant-ph"],"primary_cat":"physics.ins-det","authors_text":"DFN), Dieter Meschede (University of Bonn), Education Network, Harald Schnatz (Physikalisch-Technische Bundesanstalt), Jochen Kronj\\\"ager (Physikalisch-Technische Bundesanstalt), Klaus Blaum (Max Planck Institute for Nuclear Physics), Peter Kaufmann (German National Research, Stefan K\\\"uck (Physikalisch-Technische Bundesanstalt), Stephan Schiller (Heinrich Heine University D\\\"usseldorf), Susanne Naegele-Jackson (Friedrich-Alexander-Universit\\\"at Erlangen-N\\\"urnberg), Tara Cubel Liebisch (Physikalisch-Technische Bundesanstalt)","submitted_at":"2025-06-04T14:27:50Z","abstract_excerpt":"The recent breakthroughs in the distribution of quantum information and high-precision time and frequency (T&F) signals over long-haul optical fibre networks have transformative potential for physically secure communications, resilience of Global Navigation Satellite Systems (GNSS) and fundamental physics. However, so far these capabilities remain confined to isolated testbeds, with quantum and T&F signals accessible, for example in Germany, to only a few institutions.\n  We propose the QTF-Backbone: a dedicated national fibre-optic infrastructure in Germany for the networked distribution of qu"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2506.03998","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2506.03998/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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"}