{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2015:UPTRGG2VTY4SLE7T2F3GXB4G6X","short_pith_number":"pith:UPTRGG2V","schema_version":"1.0","canonical_sha256":"a3e7131b559e392593f3d1766b8786f5e4b2d8b146721cccad7cf460d11941f5","source":{"kind":"arxiv","id":"1511.08485","version":1},"attestation_state":"computed","paper":{"title":"Measuring absolute frequencies beyond the GPS limit via long-haul optical frequency dissemination","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.quant-gas","physics.atom-ph","quant-ph"],"primary_cat":"physics.optics","authors_text":"A. Mura, C. Clivati, D. Calonico, F. Levi, F. Poggiali, G. A. Costanzo, G. Cappellini, G. Pagano, J. Catani, L. Fallani, L. Livi, M. Frittelli, M. Inguscio, M. Mancini, M. Siciliani de Cumis","submitted_at":"2015-11-26T19:40:38Z","abstract_excerpt":"Global Positioning System (GPS) dissemination of frequency standards is ubiquitous at present, providing the most widespread time and frequency reference for the majority of industrial and research applications worldwide. On the other hand, the ultimate limits of the GPS presently curb further advances in high-precision, scientific and industrial applications relying on this dissemination scheme. Here, we demonstrate that these limits can be reliably overcome even in laboratories without a local atomic clock by replacing the GPS with a 642-km-long optical fiber link to a remote primary caesium"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1511.08485","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2015-11-26T19:40:38Z","cross_cats_sorted":["cond-mat.quant-gas","physics.atom-ph","quant-ph"],"title_canon_sha256":"fecdb8c1a30153d3bfdc320111c8f8e247a2d795ab8dcb570063df825c97ed34","abstract_canon_sha256":"d2ff62f1774b81e55eed5ca0959c85232643b1dd1b7161546041f5f5c7da4e7d"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:11:45.367684Z","signature_b64":"iekWWPSYWMTEtSZ+FkFKbJJ3zD7Y3YmZ7u2T7MDwCNd3Zt/9dC1lL9oakOJ1OziqqdbQA2terLuTYLsY+2XMDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a3e7131b559e392593f3d1766b8786f5e4b2d8b146721cccad7cf460d11941f5","last_reissued_at":"2026-05-18T01:11:45.367350Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:11:45.367350Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Measuring absolute frequencies beyond the GPS limit via long-haul optical frequency dissemination","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.quant-gas","physics.atom-ph","quant-ph"],"primary_cat":"physics.optics","authors_text":"A. Mura, C. Clivati, D. Calonico, F. Levi, F. Poggiali, G. A. Costanzo, G. Cappellini, G. Pagano, J. Catani, L. Fallani, L. Livi, M. Frittelli, M. Inguscio, M. Mancini, M. Siciliani de Cumis","submitted_at":"2015-11-26T19:40:38Z","abstract_excerpt":"Global Positioning System (GPS) dissemination of frequency standards is ubiquitous at present, providing the most widespread time and frequency reference for the majority of industrial and research applications worldwide. On the other hand, the ultimate limits of the GPS presently curb further advances in high-precision, scientific and industrial applications relying on this dissemination scheme. Here, we demonstrate that these limits can be reliably overcome even in laboratories without a local atomic clock by replacing the GPS with a 642-km-long optical fiber link to a remote primary caesium"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1511.08485","kind":"arxiv","version":1},"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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1511.08485","created_at":"2026-05-18T01:11:45.367405+00:00"},{"alias_kind":"arxiv_version","alias_value":"1511.08485v1","created_at":"2026-05-18T01:11:45.367405+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1511.08485","created_at":"2026-05-18T01:11:45.367405+00:00"},{"alias_kind":"pith_short_12","alias_value":"UPTRGG2VTY4S","created_at":"2026-05-18T12:29:44.643036+00:00"},{"alias_kind":"pith_short_16","alias_value":"UPTRGG2VTY4SLE7T","created_at":"2026-05-18T12:29:44.643036+00:00"},{"alias_kind":"pith_short_8","alias_value":"UPTRGG2V","created_at":"2026-05-18T12:29:44.643036+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/UPTRGG2VTY4SLE7T2F3GXB4G6X","json":"https://pith.science/pith/UPTRGG2VTY4SLE7T2F3GXB4G6X.json","graph_json":"https://pith.science/api/pith-number/UPTRGG2VTY4SLE7T2F3GXB4G6X/graph.json","events_json":"https://pith.science/api/pith-number/UPTRGG2VTY4SLE7T2F3GXB4G6X/events.json","paper":"https://pith.science/paper/UPTRGG2V"},"agent_actions":{"view_html":"https://pith.science/pith/UPTRGG2VTY4SLE7T2F3GXB4G6X","download_json":"https://pith.science/pith/UPTRGG2VTY4SLE7T2F3GXB4G6X.json","view_paper":"https://pith.science/paper/UPTRGG2V","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1511.08485&json=true","fetch_graph":"https://pith.science/api/pith-number/UPTRGG2VTY4SLE7T2F3GXB4G6X/graph.json","fetch_events":"https://pith.science/api/pith-number/UPTRGG2VTY4SLE7T2F3GXB4G6X/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/UPTRGG2VTY4SLE7T2F3GXB4G6X/action/timestamp_anchor","attest_storage":"https://pith.science/pith/UPTRGG2VTY4SLE7T2F3GXB4G6X/action/storage_attestation","attest_author":"https://pith.science/pith/UPTRGG2VTY4SLE7T2F3GXB4G6X/action/author_attestation","sign_citation":"https://pith.science/pith/UPTRGG2VTY4SLE7T2F3GXB4G6X/action/citation_signature","submit_replication":"https://pith.science/pith/UPTRGG2VTY4SLE7T2F3GXB4G6X/action/replication_record"}},"created_at":"2026-05-18T01:11:45.367405+00:00","updated_at":"2026-05-18T01:11:45.367405+00:00"}