{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:URLEH32GD7KM3J5R3JOXGMEQRD","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":"66caf85ec1c7f6f62ec8f689c569399b467282167a80429e31206775187d3494","cross_cats_sorted":["physics.atom-ph","physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2018-07-19T09:40:00Z","title_canon_sha256":"ceecb0973d2b0e0699712d44ce767a447fe00e99ec42710bb21b624e6c083a83"},"schema_version":"1.0","source":{"id":"1807.08683","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1807.08683","created_at":"2026-05-17T23:42:30Z"},{"alias_kind":"arxiv_version","alias_value":"1807.08683v2","created_at":"2026-05-17T23:42:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1807.08683","created_at":"2026-05-17T23:42:30Z"},{"alias_kind":"pith_short_12","alias_value":"URLEH32GD7KM","created_at":"2026-05-18T12:32:56Z"},{"alias_kind":"pith_short_16","alias_value":"URLEH32GD7KM3J5R","created_at":"2026-05-18T12:32:56Z"},{"alias_kind":"pith_short_8","alias_value":"URLEH32G","created_at":"2026-05-18T12:32:56Z"}],"graph_snapshots":[{"event_id":"sha256:8c44751fb3825ea0a9bb7984b0568064fea7c68ffe02320619ac9bad766739e6","target":"graph","created_at":"2026-05-17T23:42:30Z","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 report on an ultralow noise optical frequency transfer from a remotely located Sr optical lattice clock laser to a Ti:Sapphire optical frequency comb through telecom-wavelength optical fiber networks. The inherent narrow linewidth of the Ti:Sapphire optical frequency comb eliminates the need for a local reference high-finesse cavity. The relative fractional frequency instability of the optical frequency comb with respect to the remote optical reference was $6.7(1) \\times 10^{-18}$ at 1 s and $1.05(3) \\times 10^{-19}$ at 1,000 s including a 2.9 km-long fiber network. This ensured the optical","authors_text":"Eunmi Chae, Kei Sugiyama, Kosuke Yoshioka, Kota Nakashima, Takuya Ikeda","cross_cats":["physics.atom-ph","physics.optics"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2018-07-19T09:40:00Z","title":"Direct Phase Locking of a Ti:Sapphire Optical Frequency Comb to a Remote Optical Frequency Standard"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1807.08683","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:ee5e930921bae1e13c34972cc6e6e3c24ce545cf7cf2649dfe0abc804c3fd699","target":"record","created_at":"2026-05-17T23:42:30Z","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":"66caf85ec1c7f6f62ec8f689c569399b467282167a80429e31206775187d3494","cross_cats_sorted":["physics.atom-ph","physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2018-07-19T09:40:00Z","title_canon_sha256":"ceecb0973d2b0e0699712d44ce767a447fe00e99ec42710bb21b624e6c083a83"},"schema_version":"1.0","source":{"id":"1807.08683","kind":"arxiv","version":2}},"canonical_sha256":"a45643ef461fd4cda7b1da5d73309088de4db194b12dd8b15face66b8a382ea6","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a45643ef461fd4cda7b1da5d73309088de4db194b12dd8b15face66b8a382ea6","first_computed_at":"2026-05-17T23:42:30.082810Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:42:30.082810Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"EicoXwDAwgCKKl6FG0eyXYkJYYSazf+D3aZKNfEvETxQuaLSrClC0n+K4Ivwi2P3ESWL70YOojqMw8m7S7tRAA==","signature_status":"signed_v1","signed_at":"2026-05-17T23:42:30.083286Z","signed_message":"canonical_sha256_bytes"},"source_id":"1807.08683","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ee5e930921bae1e13c34972cc6e6e3c24ce545cf7cf2649dfe0abc804c3fd699","sha256:8c44751fb3825ea0a9bb7984b0568064fea7c68ffe02320619ac9bad766739e6"],"state_sha256":"e46acbf2a99e4f6e2e9a4befbe972021ad8fba587ecaeefb633be23cc1992360"}