{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2002:VMDCKCVUVODM4XR7GSJVBA4PS3","short_pith_number":"pith:VMDCKCVU","canonical_record":{"source":{"id":"quant-ph/0206042","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"quant-ph","submitted_at":"2002-06-07T14:00:53Z","cross_cats_sorted":[],"title_canon_sha256":"e346ca1c2572e9e8fd7aa83d5585b85adbd70b063ed718eb2cb8e78fad8304e2","abstract_canon_sha256":"f11b133073a55caafbfa7bf9cc506fe537add5ba857a18bcdbf70089148358ba"},"schema_version":"1.0"},"canonical_sha256":"ab06250ab4ab86ce5e3f349350838f96cdf6acfef90d1fefb57a498eee444608","source":{"kind":"arxiv","id":"quant-ph/0206042","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"quant-ph/0206042","created_at":"2026-07-04T16:36:05Z"},{"alias_kind":"arxiv_version","alias_value":"quant-ph/0206042v1","created_at":"2026-07-04T16:36:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.quant-ph/0206042","created_at":"2026-07-04T16:36:05Z"},{"alias_kind":"pith_short_12","alias_value":"VMDCKCVUVODM","created_at":"2026-07-04T16:36:05Z"},{"alias_kind":"pith_short_16","alias_value":"VMDCKCVUVODM4XR7","created_at":"2026-07-04T16:36:05Z"},{"alias_kind":"pith_short_8","alias_value":"VMDCKCVU","created_at":"2026-07-04T16:36:05Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2002:VMDCKCVUVODM4XR7GSJVBA4PS3","target":"record","payload":{"canonical_record":{"source":{"id":"quant-ph/0206042","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"quant-ph","submitted_at":"2002-06-07T14:00:53Z","cross_cats_sorted":[],"title_canon_sha256":"e346ca1c2572e9e8fd7aa83d5585b85adbd70b063ed718eb2cb8e78fad8304e2","abstract_canon_sha256":"f11b133073a55caafbfa7bf9cc506fe537add5ba857a18bcdbf70089148358ba"},"schema_version":"1.0"},"canonical_sha256":"ab06250ab4ab86ce5e3f349350838f96cdf6acfef90d1fefb57a498eee444608","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T16:36:05.489254Z","signature_b64":"Rky7cJwCliD0y2RhUKqLY41bl9V/AFy1AJsEwuaZg0tn0CLRDeSYvV1CgJH3USZDoRUyfnmAohq6oYnhT+szCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ab06250ab4ab86ce5e3f349350838f96cdf6acfef90d1fefb57a498eee444608","last_reissued_at":"2026-07-04T16:36:05.488841Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T16:36:05.488841Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"quant-ph/0206042","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":"2026-07-04T16:36:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"aqD6ulGvc63dzc2/xT+5s77oviLGwF/41F6VZe2ppJkmwdvuwBjbQX4dxCoCESad2AMZN+vYg+iMUjc3AFGoCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-06T20:42:34.152045Z"},"content_sha256":"33394ff336c9d1286898c549fd0be42cdb0ec104608b1b17488491f5961b6b36","schema_version":"1.0","event_id":"sha256:33394ff336c9d1286898c549fd0be42cdb0ec104608b1b17488491f5961b6b36"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2002:VMDCKCVUVODM4XR7GSJVBA4PS3","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Does Excess Quantum Noise Exist in Spontaneous Processes?","license":"","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"A. Aiello, G. Nienhuis, J. P. Woerdman, M. P. van Exter","submitted_at":"2002-06-07T14:00:53Z","abstract_excerpt":"We investigate the role of excess quantum noise in type-II degenerate parametric down conversion in a cavity with non-orthogonal polarization eigenmodes. Since only two modes are involved we are able to derive an analytical expression for the twin-photon generation rate measured outside the cavity as a function of the degree of mode nonorthogonality. Contrary to recent claims we conclude that there is no evidence of excess quantum noise for a parametric amplifier working so far below threshold that spontaneous processes dominate."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"quant-ph/0206042","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/quant-ph/0206042/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":"2026-07-04T16:36:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"gSI8tX6ukFkgielNHhdkLZtQFJBaimxR7zYDjwp91buGdTip+TlAoWSyaTcc+X5soCKjj+ltv4xnIp9MEwMPBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-06T20:42:34.152700Z"},"content_sha256":"f069ab0f3757c77de6bcb687ff0c4166cdd48f0a34e0914eed543a714b0b2c98","schema_version":"1.0","event_id":"sha256:f069ab0f3757c77de6bcb687ff0c4166cdd48f0a34e0914eed543a714b0b2c98"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/VMDCKCVUVODM4XR7GSJVBA4PS3/bundle.json","state_url":"https://pith.science/pith/VMDCKCVUVODM4XR7GSJVBA4PS3/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/VMDCKCVUVODM4XR7GSJVBA4PS3/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":"2026-07-06T20:42:34Z","links":{"resolver":"https://pith.science/pith/VMDCKCVUVODM4XR7GSJVBA4PS3","bundle":"https://pith.science/pith/VMDCKCVUVODM4XR7GSJVBA4PS3/bundle.json","state":"https://pith.science/pith/VMDCKCVUVODM4XR7GSJVBA4PS3/state.json","well_known_bundle":"https://pith.science/.well-known/pith/VMDCKCVUVODM4XR7GSJVBA4PS3/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2002:VMDCKCVUVODM4XR7GSJVBA4PS3","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":"f11b133073a55caafbfa7bf9cc506fe537add5ba857a18bcdbf70089148358ba","cross_cats_sorted":[],"license":"","primary_cat":"quant-ph","submitted_at":"2002-06-07T14:00:53Z","title_canon_sha256":"e346ca1c2572e9e8fd7aa83d5585b85adbd70b063ed718eb2cb8e78fad8304e2"},"schema_version":"1.0","source":{"id":"quant-ph/0206042","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"quant-ph/0206042","created_at":"2026-07-04T16:36:05Z"},{"alias_kind":"arxiv_version","alias_value":"quant-ph/0206042v1","created_at":"2026-07-04T16:36:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.quant-ph/0206042","created_at":"2026-07-04T16:36:05Z"},{"alias_kind":"pith_short_12","alias_value":"VMDCKCVUVODM","created_at":"2026-07-04T16:36:05Z"},{"alias_kind":"pith_short_16","alias_value":"VMDCKCVUVODM4XR7","created_at":"2026-07-04T16:36:05Z"},{"alias_kind":"pith_short_8","alias_value":"VMDCKCVU","created_at":"2026-07-04T16:36:05Z"}],"graph_snapshots":[{"event_id":"sha256:f069ab0f3757c77de6bcb687ff0c4166cdd48f0a34e0914eed543a714b0b2c98","target":"graph","created_at":"2026-07-04T16:36:05Z","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/quant-ph/0206042/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We investigate the role of excess quantum noise in type-II degenerate parametric down conversion in a cavity with non-orthogonal polarization eigenmodes. Since only two modes are involved we are able to derive an analytical expression for the twin-photon generation rate measured outside the cavity as a function of the degree of mode nonorthogonality. Contrary to recent claims we conclude that there is no evidence of excess quantum noise for a parametric amplifier working so far below threshold that spontaneous processes dominate.","authors_text":"A. Aiello, G. Nienhuis, J. P. Woerdman, M. P. van Exter","cross_cats":[],"headline":"","license":"","primary_cat":"quant-ph","submitted_at":"2002-06-07T14:00:53Z","title":"Does Excess Quantum Noise Exist in Spontaneous Processes?"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"quant-ph/0206042","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":"sha256:33394ff336c9d1286898c549fd0be42cdb0ec104608b1b17488491f5961b6b36","target":"record","created_at":"2026-07-04T16:36:05Z","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":"f11b133073a55caafbfa7bf9cc506fe537add5ba857a18bcdbf70089148358ba","cross_cats_sorted":[],"license":"","primary_cat":"quant-ph","submitted_at":"2002-06-07T14:00:53Z","title_canon_sha256":"e346ca1c2572e9e8fd7aa83d5585b85adbd70b063ed718eb2cb8e78fad8304e2"},"schema_version":"1.0","source":{"id":"quant-ph/0206042","kind":"arxiv","version":1}},"canonical_sha256":"ab06250ab4ab86ce5e3f349350838f96cdf6acfef90d1fefb57a498eee444608","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ab06250ab4ab86ce5e3f349350838f96cdf6acfef90d1fefb57a498eee444608","first_computed_at":"2026-07-04T16:36:05.488841Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T16:36:05.488841Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Rky7cJwCliD0y2RhUKqLY41bl9V/AFy1AJsEwuaZg0tn0CLRDeSYvV1CgJH3USZDoRUyfnmAohq6oYnhT+szCw==","signature_status":"signed_v1","signed_at":"2026-07-04T16:36:05.489254Z","signed_message":"canonical_sha256_bytes"},"source_id":"quant-ph/0206042","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:33394ff336c9d1286898c549fd0be42cdb0ec104608b1b17488491f5961b6b36","sha256:f069ab0f3757c77de6bcb687ff0c4166cdd48f0a34e0914eed543a714b0b2c98"],"state_sha256":"d6619f5600336f1d8653659a7f3110610984f2406adfc683bb97c0b5a70cac11"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"PvAXPLsGKeVOSeyYH6Ctn8Fyv7I1un0u06J4utkBJxUAgRy68WPPFs5UjsYWURO4tccjNmhjH6BcxZOv8z1uAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-06T20:42:34.155533Z","bundle_sha256":"94f940d7a5db4d0dd44d5bc21c3ca3aeee792cef377da999dba6fa31f237a35b"}}