{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2017:E7DANQ7YKCVR5LIOH53DH4CPA6","short_pith_number":"pith:E7DANQ7Y","schema_version":"1.0","canonical_sha256":"27c606c3f850ab1ead0e3f7633f04f07a70cb6192fd3c2fdda68ecf0d2b53202","source":{"kind":"arxiv","id":"1707.00646","version":2},"attestation_state":"computed","paper":{"title":"Absolute frequency measurement of the $^2$S$_{1/2} \\rightarrow ^2$F$_{7/2}$ optical clock transition in $^{171}$Yb$^+$ with an uncertainty of $4\\times 10^{-16}$ using a frequency link to International Atomic Time","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.atom-ph","authors_text":"Antoine Rolland, Charles F. A. Baynham, Fred Baynes, Helen S. Margolis, Jonathan M. Jones, Kai Bongs, Patrick E. G. Baird, Patrick Gill, Peter B. R. Nisbet-Jones, Rachel M. Godun, Steven A. King","submitted_at":"2017-07-03T16:52:37Z","abstract_excerpt":"The highly forbidden $^2$S$_{1/2} \\rightarrow ^2$F$_{7/2}$ electric octupole transition in $^{171}$Yb$^+$ is a potential candidate for a redefinition of the SI second. We present a measurement of the absolute frequency of this optical transition, performed using a frequency link to International Atomic Time to provide traceability to the SI second. The $^{171}$Yb$^+$ optical frequency standard was operated for 76% of a 25-day period, with the absolute frequency measured to be 642 121 496 772 645.14(26) Hz. The fractional uncertainty of $4.0 \\times 10 ^{-16}$ is comparable to that of the best p"},"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":"1707.00646","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2017-07-03T16:52:37Z","cross_cats_sorted":[],"title_canon_sha256":"7dc6da415c59865d1e5730034f635ef8ca07445fcd72ffbfeb9a3c44cf359bb8","abstract_canon_sha256":"b202af17bfe2634cc6069557c9f3511edcb17a85927839ebd5e620d12954a217"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:30:01.654013Z","signature_b64":"njFQLJYowWyYm3zMxgYn/o0EE+lmDgVXWIjUqKqnbODtOpEswwqmpBI637x/m+VopLT/YshMM9G+x7loBXUYBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"27c606c3f850ab1ead0e3f7633f04f07a70cb6192fd3c2fdda68ecf0d2b53202","last_reissued_at":"2026-05-18T00:30:01.653364Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:30:01.653364Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Absolute frequency measurement of the $^2$S$_{1/2} \\rightarrow ^2$F$_{7/2}$ optical clock transition in $^{171}$Yb$^+$ with an uncertainty of $4\\times 10^{-16}$ using a frequency link to International Atomic Time","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.atom-ph","authors_text":"Antoine Rolland, Charles F. A. Baynham, Fred Baynes, Helen S. Margolis, Jonathan M. Jones, Kai Bongs, Patrick E. G. Baird, Patrick Gill, Peter B. R. Nisbet-Jones, Rachel M. Godun, Steven A. King","submitted_at":"2017-07-03T16:52:37Z","abstract_excerpt":"The highly forbidden $^2$S$_{1/2} \\rightarrow ^2$F$_{7/2}$ electric octupole transition in $^{171}$Yb$^+$ is a potential candidate for a redefinition of the SI second. We present a measurement of the absolute frequency of this optical transition, performed using a frequency link to International Atomic Time to provide traceability to the SI second. The $^{171}$Yb$^+$ optical frequency standard was operated for 76% of a 25-day period, with the absolute frequency measured to be 642 121 496 772 645.14(26) Hz. The fractional uncertainty of $4.0 \\times 10 ^{-16}$ is comparable to that of the best p"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1707.00646","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":"1707.00646","created_at":"2026-05-18T00:30:01.653463+00:00"},{"alias_kind":"arxiv_version","alias_value":"1707.00646v2","created_at":"2026-05-18T00:30:01.653463+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1707.00646","created_at":"2026-05-18T00:30:01.653463+00:00"},{"alias_kind":"pith_short_12","alias_value":"E7DANQ7YKCVR","created_at":"2026-05-18T12:31:12.930513+00:00"},{"alias_kind":"pith_short_16","alias_value":"E7DANQ7YKCVR5LIO","created_at":"2026-05-18T12:31:12.930513+00:00"},{"alias_kind":"pith_short_8","alias_value":"E7DANQ7Y","created_at":"2026-05-18T12:31:12.930513+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/E7DANQ7YKCVR5LIOH53DH4CPA6","json":"https://pith.science/pith/E7DANQ7YKCVR5LIOH53DH4CPA6.json","graph_json":"https://pith.science/api/pith-number/E7DANQ7YKCVR5LIOH53DH4CPA6/graph.json","events_json":"https://pith.science/api/pith-number/E7DANQ7YKCVR5LIOH53DH4CPA6/events.json","paper":"https://pith.science/paper/E7DANQ7Y"},"agent_actions":{"view_html":"https://pith.science/pith/E7DANQ7YKCVR5LIOH53DH4CPA6","download_json":"https://pith.science/pith/E7DANQ7YKCVR5LIOH53DH4CPA6.json","view_paper":"https://pith.science/paper/E7DANQ7Y","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1707.00646&json=true","fetch_graph":"https://pith.science/api/pith-number/E7DANQ7YKCVR5LIOH53DH4CPA6/graph.json","fetch_events":"https://pith.science/api/pith-number/E7DANQ7YKCVR5LIOH53DH4CPA6/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/E7DANQ7YKCVR5LIOH53DH4CPA6/action/timestamp_anchor","attest_storage":"https://pith.science/pith/E7DANQ7YKCVR5LIOH53DH4CPA6/action/storage_attestation","attest_author":"https://pith.science/pith/E7DANQ7YKCVR5LIOH53DH4CPA6/action/author_attestation","sign_citation":"https://pith.science/pith/E7DANQ7YKCVR5LIOH53DH4CPA6/action/citation_signature","submit_replication":"https://pith.science/pith/E7DANQ7YKCVR5LIOH53DH4CPA6/action/replication_record"}},"created_at":"2026-05-18T00:30:01.653463+00:00","updated_at":"2026-05-18T00:30:01.653463+00:00"}