{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2018:AI7G5RJ2RNR6XGX5PTYVFH5PU7","short_pith_number":"pith:AI7G5RJ2","schema_version":"1.0","canonical_sha256":"023e6ec53a8b63eb9afd7cf1529fafa7ea5d6eacf1aeff3ba50b8510092c4760","source":{"kind":"arxiv","id":"1808.07870","version":2},"attestation_state":"computed","paper":{"title":"Femtosecond Synchronization of Optical Clocks Off of a Flying Quadcopter","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.optics"],"primary_cat":"physics.ins-det","authors_text":"Hugo Bergeron, Isaac Khader, Jean-Daniel Desch\\^enes, Kevin C. Cossel, Laura C. Sinclair, Michael Cermak, Nathan R. Newbury, William C. Swann","submitted_at":"2018-08-22T22:58:01Z","abstract_excerpt":"Future optical clock networks will require free-space optical time-frequency transfer between flying clocks. However, simple one-way or standard two-way time transfer between flying clocks will completely break down because of the time-of-flight variations and Doppler shifts associated with the strongly time-varying optical link distances. Here, we demonstrate an advanced, comb-based optical two-way time-frequency transfer that can successfully synchronize the optical timescales at two sites connected via a time-varying turbulent air path. The link between the two sites is established using ei"},"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":"1808.07870","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2018-08-22T22:58:01Z","cross_cats_sorted":["physics.optics"],"title_canon_sha256":"7c2919a03db76cbbb0e473571a7faf924e064c748757fba7396f321f5b98c181","abstract_canon_sha256":"6900e8d11b828e85feb4e8a8a22d5c214280d173372e8c119b9def7f0da46bf1"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:43:04.673267Z","signature_b64":"JTEJwpoK7gd8YOByWjcblcGsLyoNFWJr0RWoMd7GzJ0rczYuJ3mw6bAp3OUfxlQOC8W7iYLYYNiofoYj3m4NDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"023e6ec53a8b63eb9afd7cf1529fafa7ea5d6eacf1aeff3ba50b8510092c4760","last_reissued_at":"2026-05-17T23:43:04.672653Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:43:04.672653Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Femtosecond Synchronization of Optical Clocks Off of a Flying Quadcopter","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.optics"],"primary_cat":"physics.ins-det","authors_text":"Hugo Bergeron, Isaac Khader, Jean-Daniel Desch\\^enes, Kevin C. Cossel, Laura C. Sinclair, Michael Cermak, Nathan R. Newbury, William C. Swann","submitted_at":"2018-08-22T22:58:01Z","abstract_excerpt":"Future optical clock networks will require free-space optical time-frequency transfer between flying clocks. However, simple one-way or standard two-way time transfer between flying clocks will completely break down because of the time-of-flight variations and Doppler shifts associated with the strongly time-varying optical link distances. Here, we demonstrate an advanced, comb-based optical two-way time-frequency transfer that can successfully synchronize the optical timescales at two sites connected via a time-varying turbulent air path. The link between the two sites is established using ei"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1808.07870","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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1808.07870","created_at":"2026-05-17T23:43:04.672754+00:00"},{"alias_kind":"arxiv_version","alias_value":"1808.07870v2","created_at":"2026-05-17T23:43:04.672754+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1808.07870","created_at":"2026-05-17T23:43:04.672754+00:00"},{"alias_kind":"pith_short_12","alias_value":"AI7G5RJ2RNR6","created_at":"2026-05-18T12:32:13.499390+00:00"},{"alias_kind":"pith_short_16","alias_value":"AI7G5RJ2RNR6XGX5","created_at":"2026-05-18T12:32:13.499390+00:00"},{"alias_kind":"pith_short_8","alias_value":"AI7G5RJ2","created_at":"2026-05-18T12:32:13.499390+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/AI7G5RJ2RNR6XGX5PTYVFH5PU7","json":"https://pith.science/pith/AI7G5RJ2RNR6XGX5PTYVFH5PU7.json","graph_json":"https://pith.science/api/pith-number/AI7G5RJ2RNR6XGX5PTYVFH5PU7/graph.json","events_json":"https://pith.science/api/pith-number/AI7G5RJ2RNR6XGX5PTYVFH5PU7/events.json","paper":"https://pith.science/paper/AI7G5RJ2"},"agent_actions":{"view_html":"https://pith.science/pith/AI7G5RJ2RNR6XGX5PTYVFH5PU7","download_json":"https://pith.science/pith/AI7G5RJ2RNR6XGX5PTYVFH5PU7.json","view_paper":"https://pith.science/paper/AI7G5RJ2","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1808.07870&json=true","fetch_graph":"https://pith.science/api/pith-number/AI7G5RJ2RNR6XGX5PTYVFH5PU7/graph.json","fetch_events":"https://pith.science/api/pith-number/AI7G5RJ2RNR6XGX5PTYVFH5PU7/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/AI7G5RJ2RNR6XGX5PTYVFH5PU7/action/timestamp_anchor","attest_storage":"https://pith.science/pith/AI7G5RJ2RNR6XGX5PTYVFH5PU7/action/storage_attestation","attest_author":"https://pith.science/pith/AI7G5RJ2RNR6XGX5PTYVFH5PU7/action/author_attestation","sign_citation":"https://pith.science/pith/AI7G5RJ2RNR6XGX5PTYVFH5PU7/action/citation_signature","submit_replication":"https://pith.science/pith/AI7G5RJ2RNR6XGX5PTYVFH5PU7/action/replication_record"}},"created_at":"2026-05-17T23:43:04.672754+00:00","updated_at":"2026-05-17T23:43:04.672754+00:00"}