{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2012:GVHUKRPMCPC6SJUKDCQYGTIVBX","short_pith_number":"pith:GVHUKRPM","schema_version":"1.0","canonical_sha256":"354f4545ec13c5e9268a18a1834d150ded518b3cc1b8dd4688ad963e9f673ef1","source":{"kind":"arxiv","id":"1211.4902","version":1},"attestation_state":"computed","paper":{"title":"Optical two-way time and frequency transfer over free space","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.optics","authors_text":"Esther Baumann, Fabrizio R. Giorgetta, Ian Coddington, Laura C. Sinclair, Nathan R. Newbury, William C. Swann","submitted_at":"2012-11-20T23:46:16Z","abstract_excerpt":"The transfer of high-quality time-frequency signals between remote locations underpins a broad range of applications including precision navigation and timing, the new field of clock-based geodesy, long-baseline interferometry, coherent radar arrays, tests of general relativity and fundamental constants, and the future redefinition of the second [1-7]. However, present microwave-based time-frequency transfer [8-10] is inadequate for state-of-the-art optical clocks and oscillators [1,11-15] that have femtosecond-level timing jitter and accuracies below 1E-17; as such, commensurate optically-bas"},"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":"1211.4902","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2012-11-20T23:46:16Z","cross_cats_sorted":[],"title_canon_sha256":"3a10a84e77b426f8db46cb58466f0c73438a77b8525d952b02085fc09173f339","abstract_canon_sha256":"13eefa0cb39b62d88a4ea1fd07065f34127abda0146d75befaf7f43ecb567b38"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:53:02.191378Z","signature_b64":"hHaogltdyJjAqzslY9iiPh79Gn9WwUtfjR79X4jHuQn6AgF99GvP4o403ejLr5DoUJ5KE1JiKtJDldW99xXSDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"354f4545ec13c5e9268a18a1834d150ded518b3cc1b8dd4688ad963e9f673ef1","last_reissued_at":"2026-05-18T01:53:02.190648Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:53:02.190648Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Optical two-way time and frequency transfer over free space","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.optics","authors_text":"Esther Baumann, Fabrizio R. Giorgetta, Ian Coddington, Laura C. Sinclair, Nathan R. Newbury, William C. Swann","submitted_at":"2012-11-20T23:46:16Z","abstract_excerpt":"The transfer of high-quality time-frequency signals between remote locations underpins a broad range of applications including precision navigation and timing, the new field of clock-based geodesy, long-baseline interferometry, coherent radar arrays, tests of general relativity and fundamental constants, and the future redefinition of the second [1-7]. However, present microwave-based time-frequency transfer [8-10] is inadequate for state-of-the-art optical clocks and oscillators [1,11-15] that have femtosecond-level timing jitter and accuracies below 1E-17; as such, commensurate optically-bas"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1211.4902","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":"1211.4902","created_at":"2026-05-18T01:53:02.190766+00:00"},{"alias_kind":"arxiv_version","alias_value":"1211.4902v1","created_at":"2026-05-18T01:53:02.190766+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1211.4902","created_at":"2026-05-18T01:53:02.190766+00:00"},{"alias_kind":"pith_short_12","alias_value":"GVHUKRPMCPC6","created_at":"2026-05-18T12:27:06.952714+00:00"},{"alias_kind":"pith_short_16","alias_value":"GVHUKRPMCPC6SJUK","created_at":"2026-05-18T12:27:06.952714+00:00"},{"alias_kind":"pith_short_8","alias_value":"GVHUKRPM","created_at":"2026-05-18T12:27:06.952714+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/GVHUKRPMCPC6SJUKDCQYGTIVBX","json":"https://pith.science/pith/GVHUKRPMCPC6SJUKDCQYGTIVBX.json","graph_json":"https://pith.science/api/pith-number/GVHUKRPMCPC6SJUKDCQYGTIVBX/graph.json","events_json":"https://pith.science/api/pith-number/GVHUKRPMCPC6SJUKDCQYGTIVBX/events.json","paper":"https://pith.science/paper/GVHUKRPM"},"agent_actions":{"view_html":"https://pith.science/pith/GVHUKRPMCPC6SJUKDCQYGTIVBX","download_json":"https://pith.science/pith/GVHUKRPMCPC6SJUKDCQYGTIVBX.json","view_paper":"https://pith.science/paper/GVHUKRPM","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1211.4902&json=true","fetch_graph":"https://pith.science/api/pith-number/GVHUKRPMCPC6SJUKDCQYGTIVBX/graph.json","fetch_events":"https://pith.science/api/pith-number/GVHUKRPMCPC6SJUKDCQYGTIVBX/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/GVHUKRPMCPC6SJUKDCQYGTIVBX/action/timestamp_anchor","attest_storage":"https://pith.science/pith/GVHUKRPMCPC6SJUKDCQYGTIVBX/action/storage_attestation","attest_author":"https://pith.science/pith/GVHUKRPMCPC6SJUKDCQYGTIVBX/action/author_attestation","sign_citation":"https://pith.science/pith/GVHUKRPMCPC6SJUKDCQYGTIVBX/action/citation_signature","submit_replication":"https://pith.science/pith/GVHUKRPMCPC6SJUKDCQYGTIVBX/action/replication_record"}},"created_at":"2026-05-18T01:53:02.190766+00:00","updated_at":"2026-05-18T01:53:02.190766+00:00"}