{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2002:DH7MYEA25MRYG33KCCJRLIXVDV","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":"39d81dfd2fd54b2527d12eea93b8b2f4dbe489228803ed5a1672a8ef34718382","cross_cats_sorted":[],"license":"","primary_cat":"gr-qc","submitted_at":"2002-08-18T16:58:41Z","title_canon_sha256":"caf1d9c1ed6f3ee99f563078893866bdb5237c020fa0da645325371d7679fbc8"},"schema_version":"1.0","source":{"id":"gr-qc/0208051","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"gr-qc/0208051","created_at":"2026-07-04T16:33:46Z"},{"alias_kind":"arxiv_version","alias_value":"gr-qc/0208051v1","created_at":"2026-07-04T16:33:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.gr-qc/0208051","created_at":"2026-07-04T16:33:46Z"},{"alias_kind":"pith_short_12","alias_value":"DH7MYEA25MRY","created_at":"2026-07-04T16:33:46Z"},{"alias_kind":"pith_short_16","alias_value":"DH7MYEA25MRYG33K","created_at":"2026-07-04T16:33:46Z"},{"alias_kind":"pith_short_8","alias_value":"DH7MYEA2","created_at":"2026-07-04T16:33:46Z"}],"graph_snapshots":[{"event_id":"sha256:302a51eb575d0901aa02f2a62010d9fd74e3902483f56841b659949415b82a39","target":"graph","created_at":"2026-07-04T16:33:46Z","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/gr-qc/0208051/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"According to quantum measurement theory, \"speed meters\" -- devices that measure the momentum, or speed, of free test masses -- are immune to the standard quantum limit (SQL). It is shown that a Sagnac-interferometer gravitational-wave detector is a speed meter and therefore in principle it can beat the SQL by large amounts over a wide band of frequencies. It is shown, further, that, when one ignores optical losses, a signal-recycled Sagnac interferometer with Fabry-Perot arm cavities has precisely the same performance, for the same circulating light power, as the Michelson speed-meter interfer","authors_text":"Yanbei Chen","cross_cats":[],"headline":"","license":"","primary_cat":"gr-qc","submitted_at":"2002-08-18T16:58:41Z","title":"Sagnac Interferometer as a Speed-Meter-Type, Quantum-Nondemolition Gravitational-Wave Detector"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"gr-qc/0208051","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":"sha256:830f3c15d20a9109a6fa3dd1a87f402238be509b421dc2b7b10da649ac3063b8","target":"record","created_at":"2026-07-04T16:33:46Z","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":"39d81dfd2fd54b2527d12eea93b8b2f4dbe489228803ed5a1672a8ef34718382","cross_cats_sorted":[],"license":"","primary_cat":"gr-qc","submitted_at":"2002-08-18T16:58:41Z","title_canon_sha256":"caf1d9c1ed6f3ee99f563078893866bdb5237c020fa0da645325371d7679fbc8"},"schema_version":"1.0","source":{"id":"gr-qc/0208051","kind":"arxiv","version":1}},"canonical_sha256":"19fecc101aeb23836f6a109315a2f51d7f0505c57d9b0a377eccb7fd23f7152e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"19fecc101aeb23836f6a109315a2f51d7f0505c57d9b0a377eccb7fd23f7152e","first_computed_at":"2026-07-04T16:33:46.168000Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T16:33:46.168000Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"QdVXvUPdkyiFKe86DSfVTLbZa9AgqZRV3wjsi68emtk9AT82tih17noD4wg5Btgd5SIqO1NBxgaufWfCHDSTCQ==","signature_status":"signed_v1","signed_at":"2026-07-04T16:33:46.168348Z","signed_message":"canonical_sha256_bytes"},"source_id":"gr-qc/0208051","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:830f3c15d20a9109a6fa3dd1a87f402238be509b421dc2b7b10da649ac3063b8","sha256:302a51eb575d0901aa02f2a62010d9fd74e3902483f56841b659949415b82a39"],"state_sha256":"0833672b73794d4daa744273fad37455afd600024a11b8173d177602a5eb540a"}