{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2026:HXBSLIHWC7PSQXRU2EEJHDZQQ5","short_pith_number":"pith:HXBSLIHW","schema_version":"1.0","canonical_sha256":"3dc325a0f617df285e34d108938f30877a7c24240df5841d98587af5752d01e4","source":{"kind":"arxiv","id":"2607.07044","version":1},"attestation_state":"computed","paper":{"title":"Absolute frequency measurement of the $^{176}$Lu$^+\\,(^{3}\\mathrm{D}_1)$ standard against the NRC-FCs2 fountain with $2.6\\times10^{-16}$ uncertainty","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["quant-ph"],"primary_cat":"physics.atom-ph","authors_text":"Bin Jian, K. J. Arnold, M. D. Barrett, M. D. K. Lee, N. Jayjong, Qin Qichen, Qi Zhao, Scott Beattie, Zhao Zhang","submitted_at":"2026-07-08T06:21:14Z","abstract_excerpt":"We report an improved absolute frequency measurement of the $^{176}$Lu$^+\\,(^{3}\\mathrm{D}_1)$ optical frequency standard, evaluated via a remote link to the NRC-FCs2 caesium fountain primary frequency standard. Operating a single ion clock with 94.2% uptime over 10 days, and using an ambiguity-resolved precise point positioning (PPP-AR) link over the Global Positioning System (GPS), we determine an absolute frequency of $353\\,638\\,794\\,073\\,800.33(9)\\,$Hz at a fractional uncertainty of $2.6 \\times 10^{-16}$. This agrees with our previous result, which underpins the CIPM recommended frequency "},"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":"2607.07044","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.atom-ph","submitted_at":"2026-07-08T06:21:14Z","cross_cats_sorted":["quant-ph"],"title_canon_sha256":"f076a202046e40e67ff05a5dbd63447a5e0f4d9779af1f0ab1e5fcf5633b8ae4","abstract_canon_sha256":"c91db53813ac064b3415d289839a55e6b0a36480a793d03c75f63ee56dab3e47"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-09T01:20:13.102606Z","signature_b64":"FburM2a0105WSYqU9+wDjWsHZO3ByMOmQLLCxmzjsioGP4e0EW+czDsp7u0NPs+f5xfHMJ6DoPwfjvjNx+AGCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3dc325a0f617df285e34d108938f30877a7c24240df5841d98587af5752d01e4","last_reissued_at":"2026-07-09T01:20:13.102254Z","signature_status":"signed_v1","first_computed_at":"2026-07-09T01:20:13.102254Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Absolute frequency measurement of the $^{176}$Lu$^+\\,(^{3}\\mathrm{D}_1)$ standard against the NRC-FCs2 fountain with $2.6\\times10^{-16}$ uncertainty","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["quant-ph"],"primary_cat":"physics.atom-ph","authors_text":"Bin Jian, K. J. Arnold, M. D. Barrett, M. D. K. Lee, N. Jayjong, Qin Qichen, Qi Zhao, Scott Beattie, Zhao Zhang","submitted_at":"2026-07-08T06:21:14Z","abstract_excerpt":"We report an improved absolute frequency measurement of the $^{176}$Lu$^+\\,(^{3}\\mathrm{D}_1)$ optical frequency standard, evaluated via a remote link to the NRC-FCs2 caesium fountain primary frequency standard. Operating a single ion clock with 94.2% uptime over 10 days, and using an ambiguity-resolved precise point positioning (PPP-AR) link over the Global Positioning System (GPS), we determine an absolute frequency of $353\\,638\\,794\\,073\\,800.33(9)\\,$Hz at a fractional uncertainty of $2.6 \\times 10^{-16}$. This agrees with our previous result, which underpins the CIPM recommended frequency "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.07044","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2607.07044/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"},"aliases":[{"alias_kind":"arxiv","alias_value":"2607.07044","created_at":"2026-07-09T01:20:13.102308+00:00"},{"alias_kind":"arxiv_version","alias_value":"2607.07044v1","created_at":"2026-07-09T01:20:13.102308+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2607.07044","created_at":"2026-07-09T01:20:13.102308+00:00"},{"alias_kind":"pith_short_12","alias_value":"HXBSLIHWC7PS","created_at":"2026-07-09T01:20:13.102308+00:00"},{"alias_kind":"pith_short_16","alias_value":"HXBSLIHWC7PSQXRU","created_at":"2026-07-09T01:20:13.102308+00:00"},{"alias_kind":"pith_short_8","alias_value":"HXBSLIHW","created_at":"2026-07-09T01:20:13.102308+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/HXBSLIHWC7PSQXRU2EEJHDZQQ5","json":"https://pith.science/pith/HXBSLIHWC7PSQXRU2EEJHDZQQ5.json","graph_json":"https://pith.science/api/pith-number/HXBSLIHWC7PSQXRU2EEJHDZQQ5/graph.json","events_json":"https://pith.science/api/pith-number/HXBSLIHWC7PSQXRU2EEJHDZQQ5/events.json","paper":"https://pith.science/paper/HXBSLIHW"},"agent_actions":{"view_html":"https://pith.science/pith/HXBSLIHWC7PSQXRU2EEJHDZQQ5","download_json":"https://pith.science/pith/HXBSLIHWC7PSQXRU2EEJHDZQQ5.json","view_paper":"https://pith.science/paper/HXBSLIHW","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2607.07044&json=true","fetch_graph":"https://pith.science/api/pith-number/HXBSLIHWC7PSQXRU2EEJHDZQQ5/graph.json","fetch_events":"https://pith.science/api/pith-number/HXBSLIHWC7PSQXRU2EEJHDZQQ5/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/HXBSLIHWC7PSQXRU2EEJHDZQQ5/action/timestamp_anchor","attest_storage":"https://pith.science/pith/HXBSLIHWC7PSQXRU2EEJHDZQQ5/action/storage_attestation","attest_author":"https://pith.science/pith/HXBSLIHWC7PSQXRU2EEJHDZQQ5/action/author_attestation","sign_citation":"https://pith.science/pith/HXBSLIHWC7PSQXRU2EEJHDZQQ5/action/citation_signature","submit_replication":"https://pith.science/pith/HXBSLIHWC7PSQXRU2EEJHDZQQ5/action/replication_record"}},"created_at":"2026-07-09T01:20:13.102308+00:00","updated_at":"2026-07-09T01:20:13.102308+00:00"}