{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:HIJXSE4PFWEUWJOU7WQSKCZXGV","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"ea6c8f7fba1e92cfbb98ef066eea04dd16d360a49b12096efc7ba09e5694519c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2013-07-20T00:11:56Z","title_canon_sha256":"e9a681483193dd40b38278d90ffede296f9b45c7199786ab9920fb90845702c3"},"schema_version":"1.0","source":{"id":"1307.5355","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1307.5355","created_at":"2026-05-18T01:48:42Z"},{"alias_kind":"arxiv_version","alias_value":"1307.5355v2","created_at":"2026-05-18T01:48:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1307.5355","created_at":"2026-05-18T01:48:42Z"},{"alias_kind":"pith_short_12","alias_value":"HIJXSE4PFWEU","created_at":"2026-05-18T12:27:46Z"},{"alias_kind":"pith_short_16","alias_value":"HIJXSE4PFWEUWJOU","created_at":"2026-05-18T12:27:46Z"},{"alias_kind":"pith_short_8","alias_value":"HIJXSE4P","created_at":"2026-05-18T12:27:46Z"}],"graph_snapshots":[{"event_id":"sha256:344e99737180c40d8c076ccb1e9f20d61bb8150e4c8357670be71d051fd49b98","target":"graph","created_at":"2026-05-18T01:48:42Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"We present and analyze four frequency measurements designed to characterize the performance of an optical frequency reference based on spectral hole burning in \\EuYSO. The first frequency comparison, between a single unperturbed spectral hole and a hydrogen maser, demonstrates a fractional frequency drift rate of $5 \\times 10^{-18}$ s$^{-1}$. Optical-frequency comparisons between a pattern of spectral holes, a Fabry-P\\'erot cavity, and an Al$^+$ optical atomic clock show a short-term fractional frequency stability of $1 \\times10^{-15} \\tau^{-1/2}$ that averages down to $2.5^{+1.1}_{-0.5} \\time","authors_text":"Chin-wen Chou, David R. Leibrandt, Michael J. Thorpe, Scott A. Diddams, Tara M. Fortier, Till Rosenband","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2013-07-20T00:11:56Z","title":"Absolute and relative stability of an optical frequency reference based on spectral hole burning in Eu$^{3+}$:Y$_2$SiO$_5$"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1307.5355","kind":"arxiv","version":2},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:7796e263aa1ce386c38cc98538585571bf013790d160f4bf7bdf67489823b0f5","target":"record","created_at":"2026-05-18T01:48:42Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"ea6c8f7fba1e92cfbb98ef066eea04dd16d360a49b12096efc7ba09e5694519c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2013-07-20T00:11:56Z","title_canon_sha256":"e9a681483193dd40b38278d90ffede296f9b45c7199786ab9920fb90845702c3"},"schema_version":"1.0","source":{"id":"1307.5355","kind":"arxiv","version":2}},"canonical_sha256":"3a1379138f2d894b25d4fda1250b37357d041436aa7a3d5dc297379a4a972f8c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3a1379138f2d894b25d4fda1250b37357d041436aa7a3d5dc297379a4a972f8c","first_computed_at":"2026-05-18T01:48:42.260422Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:48:42.260422Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"KHLWxpbxJyALjgweNGpsS1Zkh2WXkOG/9Sn/m7n30g0htRd03XDxfJlUSeV5gqzoKTcAP3n5/PGm5z25zLQUCw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:48:42.261157Z","signed_message":"canonical_sha256_bytes"},"source_id":"1307.5355","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7796e263aa1ce386c38cc98538585571bf013790d160f4bf7bdf67489823b0f5","sha256:344e99737180c40d8c076ccb1e9f20d61bb8150e4c8357670be71d051fd49b98"],"state_sha256":"72c2473238a2f7582bda47c1595768ee181658509b3cfae95396693cf98e3320"}