{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:NRV2PCVP6775HCSADY2AFZ4NJ4","short_pith_number":"pith:NRV2PCVP","canonical_record":{"source":{"id":"2608.13009","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2026-08-13T09:26:42Z","cross_cats_sorted":["physics.ins-det"],"title_canon_sha256":"14dc900c50d009e0775528c7d7132ed2be4776449d92c81fd34a56fd8d453f25","abstract_canon_sha256":"031627ad5194ce63423b20187a86e25ccbb9553afe0cf1d67e1dfbcceb006dc9"},"schema_version":"1.0"},"canonical_sha256":"6c6ba78aaff7ffd38a401e3402e78d4f1404c97c7457f531289041139b1fcbc7","source":{"kind":"arxiv","id":"2608.13009","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2608.13009","created_at":"2026-08-14T01:00:07Z"},{"alias_kind":"arxiv_version","alias_value":"2608.13009v1","created_at":"2026-08-14T01:00:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2608.13009","created_at":"2026-08-14T01:00:07Z"},{"alias_kind":"pith_short_12","alias_value":"NRV2PCVP6775","created_at":"2026-08-14T01:00:07Z"},{"alias_kind":"pith_short_16","alias_value":"NRV2PCVP6775HCSA","created_at":"2026-08-14T01:00:07Z"},{"alias_kind":"pith_short_8","alias_value":"NRV2PCVP","created_at":"2026-08-14T01:00:07Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:NRV2PCVP6775HCSADY2AFZ4NJ4","target":"record","payload":{"canonical_record":{"source":{"id":"2608.13009","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2026-08-13T09:26:42Z","cross_cats_sorted":["physics.ins-det"],"title_canon_sha256":"14dc900c50d009e0775528c7d7132ed2be4776449d92c81fd34a56fd8d453f25","abstract_canon_sha256":"031627ad5194ce63423b20187a86e25ccbb9553afe0cf1d67e1dfbcceb006dc9"},"schema_version":"1.0"},"canonical_sha256":"6c6ba78aaff7ffd38a401e3402e78d4f1404c97c7457f531289041139b1fcbc7","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-08-14T01:00:07.452619Z","signature_b64":"8Hp1f4n3UqpttrFhlmjV1ZYoL56VlcgJvRecjQaIQFEtiDoPVAhbkyLhk08bEe2MVmFBZP2GzGAC9cH43v72CQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6c6ba78aaff7ffd38a401e3402e78d4f1404c97c7457f531289041139b1fcbc7","last_reissued_at":"2026-08-14T01:00:07.450685Z","signature_status":"signed_v1","first_computed_at":"2026-08-14T01:00:07.450685Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2608.13009","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-08-14T01:00:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mOfOXB5l4HRCui1n9RpGQC5+fqOZHsfRdR5IRkm1c/hm33ZZlVgeLvwvI7yAwiXEFF3YNheTYEG2emQxcsMJAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-19T13:15:15.749555Z"},"content_sha256":"ab3e69366c8215faf56771f7f93b59ad90125a46e979b1cd71a8787c22354be3","schema_version":"1.0","event_id":"sha256:ab3e69366c8215faf56771f7f93b59ad90125a46e979b1cd71a8787c22354be3"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:NRV2PCVP6775HCSADY2AFZ4NJ4","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Cyclic-Quadrature Intracavity Signal Amplification for Gravitational-Wave Detectors","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.ins-det"],"primary_cat":"physics.optics","authors_text":"Kaido Suzuki, Ken-ichi Harada, Kentaro Somiya, Ryo Iden","submitted_at":"2026-08-13T09:26:42Z","abstract_excerpt":"The high-frequency sensitivity of laser-interferometric gravitational-wave detectors is limited by quantum shot noise. Increasing the circulating optical power reduces shot noise, but is constrained by thermal effects and optomechanical instabilities. We propose cyclic-quadrature intracavity signal amplification, in which an optical parametric amplifier (OPA) inside a detuned signal-recycling cavity is used as a phase-sensitive amplifier of the gravitational-wave signal quadrature. By detuning the signal-recycling cavity for $\\pi$/4, the optical quadratures rotate by $\\pi$/2 on each round trip"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2608.13009","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2608.13009/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-08-14T01:00:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DTf+JoxxLWn1g1kpjeX41VC6H8ra0H1t81yhBvkjpu8Uqu/JbfWIjN7LMIP/IQZmn3Y1XN/aAFqeUAuauaeKAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-19T13:15:15.749930Z"},"content_sha256":"232ecf625ad8baf8881e381839b7fd6f339ae3e2a953a99d126aacc7096f4a6d","schema_version":"1.0","event_id":"sha256:232ecf625ad8baf8881e381839b7fd6f339ae3e2a953a99d126aacc7096f4a6d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/NRV2PCVP6775HCSADY2AFZ4NJ4/bundle.json","state_url":"https://pith.science/pith/NRV2PCVP6775HCSADY2AFZ4NJ4/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/NRV2PCVP6775HCSADY2AFZ4NJ4/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-08-19T13:15:15Z","links":{"resolver":"https://pith.science/pith/NRV2PCVP6775HCSADY2AFZ4NJ4","bundle":"https://pith.science/pith/NRV2PCVP6775HCSADY2AFZ4NJ4/bundle.json","state":"https://pith.science/pith/NRV2PCVP6775HCSADY2AFZ4NJ4/state.json","well_known_bundle":"https://pith.science/.well-known/pith/NRV2PCVP6775HCSADY2AFZ4NJ4/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:NRV2PCVP6775HCSADY2AFZ4NJ4","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":"031627ad5194ce63423b20187a86e25ccbb9553afe0cf1d67e1dfbcceb006dc9","cross_cats_sorted":["physics.ins-det"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2026-08-13T09:26:42Z","title_canon_sha256":"14dc900c50d009e0775528c7d7132ed2be4776449d92c81fd34a56fd8d453f25"},"schema_version":"1.0","source":{"id":"2608.13009","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2608.13009","created_at":"2026-08-14T01:00:07Z"},{"alias_kind":"arxiv_version","alias_value":"2608.13009v1","created_at":"2026-08-14T01:00:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2608.13009","created_at":"2026-08-14T01:00:07Z"},{"alias_kind":"pith_short_12","alias_value":"NRV2PCVP6775","created_at":"2026-08-14T01:00:07Z"},{"alias_kind":"pith_short_16","alias_value":"NRV2PCVP6775HCSA","created_at":"2026-08-14T01:00:07Z"},{"alias_kind":"pith_short_8","alias_value":"NRV2PCVP","created_at":"2026-08-14T01:00:07Z"}],"graph_snapshots":[{"event_id":"sha256:232ecf625ad8baf8881e381839b7fd6f339ae3e2a953a99d126aacc7096f4a6d","target":"graph","created_at":"2026-08-14T01:00:07Z","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/2608.13009/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The high-frequency sensitivity of laser-interferometric gravitational-wave detectors is limited by quantum shot noise. Increasing the circulating optical power reduces shot noise, but is constrained by thermal effects and optomechanical instabilities. We propose cyclic-quadrature intracavity signal amplification, in which an optical parametric amplifier (OPA) inside a detuned signal-recycling cavity is used as a phase-sensitive amplifier of the gravitational-wave signal quadrature. By detuning the signal-recycling cavity for $\\pi$/4, the optical quadratures rotate by $\\pi$/2 on each round trip","authors_text":"Kaido Suzuki, Ken-ichi Harada, Kentaro Somiya, Ryo Iden","cross_cats":["physics.ins-det"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2026-08-13T09:26:42Z","title":"Cyclic-Quadrature Intracavity Signal Amplification for Gravitational-Wave Detectors"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2608.13009","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:ab3e69366c8215faf56771f7f93b59ad90125a46e979b1cd71a8787c22354be3","target":"record","created_at":"2026-08-14T01:00:07Z","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":"031627ad5194ce63423b20187a86e25ccbb9553afe0cf1d67e1dfbcceb006dc9","cross_cats_sorted":["physics.ins-det"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2026-08-13T09:26:42Z","title_canon_sha256":"14dc900c50d009e0775528c7d7132ed2be4776449d92c81fd34a56fd8d453f25"},"schema_version":"1.0","source":{"id":"2608.13009","kind":"arxiv","version":1}},"canonical_sha256":"6c6ba78aaff7ffd38a401e3402e78d4f1404c97c7457f531289041139b1fcbc7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6c6ba78aaff7ffd38a401e3402e78d4f1404c97c7457f531289041139b1fcbc7","first_computed_at":"2026-08-14T01:00:07.450685Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-08-14T01:00:07.450685Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"8Hp1f4n3UqpttrFhlmjV1ZYoL56VlcgJvRecjQaIQFEtiDoPVAhbkyLhk08bEe2MVmFBZP2GzGAC9cH43v72CQ==","signature_status":"signed_v1","signed_at":"2026-08-14T01:00:07.452619Z","signed_message":"canonical_sha256_bytes"},"source_id":"2608.13009","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ab3e69366c8215faf56771f7f93b59ad90125a46e979b1cd71a8787c22354be3","sha256:232ecf625ad8baf8881e381839b7fd6f339ae3e2a953a99d126aacc7096f4a6d"],"state_sha256":"2df90b400c7fc1369e0d5c62ecc4d9cc4290e9a00962a6076d2d6bd3fb33063e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QGLsZXGlhLtsuaT14Zydk3lBK/di+WArLTwukqzmbNHYf+U5DajHdSZZF/1NDfmu/0LS8z+S1uXmgNbgzY/GDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-19T13:15:15.752352Z","bundle_sha256":"8b1c00931d6d4b1f870120d2cb6087aaacb8002322f2bfcb80585768a8d022d4"}}