{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:ZH26XORLCZKOQPR2HPOYQPMONT","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":"1485a03aab13165e52257e009d4b005047ff086443001d9bf6778f195c204e53","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2011-05-07T11:41:42Z","title_canon_sha256":"79f7924aab79670be0cf2d6bb8d6bdc89112cf5f5d546be87b7c647eaa84a8ad"},"schema_version":"1.0","source":{"id":"1105.1434","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1105.1434","created_at":"2026-05-18T02:02:02Z"},{"alias_kind":"arxiv_version","alias_value":"1105.1434v1","created_at":"2026-05-18T02:02:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1105.1434","created_at":"2026-05-18T02:02:02Z"},{"alias_kind":"pith_short_12","alias_value":"ZH26XORLCZKO","created_at":"2026-05-18T12:26:47Z"},{"alias_kind":"pith_short_16","alias_value":"ZH26XORLCZKOQPR2","created_at":"2026-05-18T12:26:47Z"},{"alias_kind":"pith_short_8","alias_value":"ZH26XORL","created_at":"2026-05-18T12:26:47Z"}],"graph_snapshots":[{"event_id":"sha256:e51f55200388f82f27593605497304da5b78ce2ffa9232b996a1d39332368b45","target":"graph","created_at":"2026-05-18T02:02:02Z","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 an optical frequency divider based on a 200 MHz repetition rate Er:fiber mode-locked laser that, when locked to a stable optical frequency reference, generates microwave signals with absolute phase noise that is equal to or better than cryogenic microwave oscillators. At 1 Hz offset from a 10 GHz carrier, the phase noise is below -100 dBc/Hz, limited by the optical reference. For offset frequencies > 10 kHz, the phase noise is shot noise limited at -145 dBc/Hz. An analysis of the contribution of the residual noise from the Er:fiber optical frequency divider is also presented.","authors_text":"A. D. Ludlow, C. W. Oates, F. Quinlan, J. A. Taylor, M. J. Thorpe, M. S. Kirchner, N. Lemke, S. A. Diddams, T. M. Fortier, Y. Jiang","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2011-05-07T11:41:42Z","title":"Ultralow phase noise microwave generation with an Er:fiber-based optical frequency divider"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1105.1434","kind":"arxiv","version":1},"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:b153096e57c45fdec982b2705ff43fbc81dbb15063ce90f8c572e98a046f3532","target":"record","created_at":"2026-05-18T02:02:02Z","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":"1485a03aab13165e52257e009d4b005047ff086443001d9bf6778f195c204e53","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2011-05-07T11:41:42Z","title_canon_sha256":"79f7924aab79670be0cf2d6bb8d6bdc89112cf5f5d546be87b7c647eaa84a8ad"},"schema_version":"1.0","source":{"id":"1105.1434","kind":"arxiv","version":1}},"canonical_sha256":"c9f5ebba2b1654e83e3a3bdd883d8e6cf94cc434ca0be3109d6504bbf1d61ac7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c9f5ebba2b1654e83e3a3bdd883d8e6cf94cc434ca0be3109d6504bbf1d61ac7","first_computed_at":"2026-05-18T02:02:02.928281Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:02:02.928281Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"rzoQQ0AUIGMagfjL3l55/hXF+kgH/cmb1Q5a8yKIs/6WDA5cz5hf4rpfMgOv4QUfaTJU4JZzSAvJI34Z3hqJBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:02:02.929009Z","signed_message":"canonical_sha256_bytes"},"source_id":"1105.1434","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b153096e57c45fdec982b2705ff43fbc81dbb15063ce90f8c572e98a046f3532","sha256:e51f55200388f82f27593605497304da5b78ce2ffa9232b996a1d39332368b45"],"state_sha256":"4a7e4967f7106b393aee9d6be0aa9c7cb0c6f0323ea06f8a932e92bbb9206623"}