{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:MLK23DYRIXNJKBLXYZWGD6WJ2U","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":"d2a078fcc89620e8eabb8a8d0ecedab1526a296d7e9aa5d762766df1622784d7","cross_cats_sorted":["physics.atom-ph"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.optics","submitted_at":"2025-04-23T14:02:41Z","title_canon_sha256":"e189ac7487986c9305ecb3605a4a0e0eb0f0e2e7ddf51876a976d8138c6f2863"},"schema_version":"1.0","source":{"id":"2504.16731","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2504.16731","created_at":"2026-07-05T10:53:55Z"},{"alias_kind":"arxiv_version","alias_value":"2504.16731v1","created_at":"2026-07-05T10:53:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2504.16731","created_at":"2026-07-05T10:53:55Z"},{"alias_kind":"pith_short_12","alias_value":"MLK23DYRIXNJ","created_at":"2026-07-05T10:53:55Z"},{"alias_kind":"pith_short_16","alias_value":"MLK23DYRIXNJKBLX","created_at":"2026-07-05T10:53:55Z"},{"alias_kind":"pith_short_8","alias_value":"MLK23DYR","created_at":"2026-07-05T10:53:55Z"}],"graph_snapshots":[{"event_id":"sha256:3edd4501e1f1067ee69e3315cf54e3fbd8b14bb4032cf48a15d81509ac74da31","target":"graph","created_at":"2026-07-05T10:53:55Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2504.16731/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Frequency stabilisation of lasers to optical reference cavities is an established method to achieve state-of-the-art stability. The strengths of this method are the high discriminator coefficient of optical cavities, and the low-noise extraction of the stabilisation signal using modulation techniques. In this Letter we report beyond state-of-the-art performance on both of these fundamentals, unlocking $10^{-19}$ fractional frequency laser stabilisation. We employ a 68 cm long cavity to realise an optical storage time of 300 microseconds, achieving ultrahigh frequency discrimination. We develop","authors_text":"Adam L. Parke, Marco Schioppo","cross_cats":["physics.atom-ph"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.optics","submitted_at":"2025-04-23T14:02:41Z","title":"300 {\\mu}s optical cavity storage time and $\\mathbf{10^{-7}}$ active RAM cancellation for $\\mathbf{10^{-19}}$ laser frequency stabilisation"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2504.16731","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":"sha256:3a02686d7f0b6d6b28f65fb84b145c6d1af955f335cda7b8d4fb1b4a3240cdc0","target":"record","created_at":"2026-07-05T10:53:55Z","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":"d2a078fcc89620e8eabb8a8d0ecedab1526a296d7e9aa5d762766df1622784d7","cross_cats_sorted":["physics.atom-ph"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.optics","submitted_at":"2025-04-23T14:02:41Z","title_canon_sha256":"e189ac7487986c9305ecb3605a4a0e0eb0f0e2e7ddf51876a976d8138c6f2863"},"schema_version":"1.0","source":{"id":"2504.16731","kind":"arxiv","version":1}},"canonical_sha256":"62d5ad8f1145da950577c66c61fac9d50440dd5b18a1fd1c199c310173f2bf3c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"62d5ad8f1145da950577c66c61fac9d50440dd5b18a1fd1c199c310173f2bf3c","first_computed_at":"2026-07-05T10:53:55.290473Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T10:53:55.290473Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"zvfv4czUSJYx1IzCue4i/ZO9plLSATwMjozaliVktwnBlT3McxcfGFnC48zDU0O7aMrX95L7uCuy4qV6qNkYDQ==","signature_status":"signed_v1","signed_at":"2026-07-05T10:53:55.291108Z","signed_message":"canonical_sha256_bytes"},"source_id":"2504.16731","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3a02686d7f0b6d6b28f65fb84b145c6d1af955f335cda7b8d4fb1b4a3240cdc0","sha256:3edd4501e1f1067ee69e3315cf54e3fbd8b14bb4032cf48a15d81509ac74da31"],"state_sha256":"da27fafcaef3fb574cbd14f5787f6e5ecb9b72f58fa14ca986a73b3b2fa71ef9"}