{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:1999:S75TZI3426WEKJ4VZ6NGE67UFR","short_pith_number":"pith:S75TZI34","canonical_record":{"source":{"id":"quant-ph/9911032","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"quant-ph","submitted_at":"1999-11-08T15:47:10Z","cross_cats_sorted":["physics.optics"],"title_canon_sha256":"5ceca5473a1844a8eb47fc0a9c27b6e8bba855335f228bf82011c5b5a1bba599","abstract_canon_sha256":"5e7ff307cc03f0ad682fd16a01d2d58aa3e82a0bcfef28ae85a3ed03e1cfe437"},"schema_version":"1.0"},"canonical_sha256":"97fb3ca37cd7ac452795cf9a627bf42c4a240dba848e2a51162aed6e50fbf60b","source":{"kind":"arxiv","id":"quant-ph/9911032","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"quant-ph/9911032","created_at":"2026-05-18T01:37:52Z"},{"alias_kind":"arxiv_version","alias_value":"quant-ph/9911032v1","created_at":"2026-05-18T01:37:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.quant-ph/9911032","created_at":"2026-05-18T01:37:52Z"},{"alias_kind":"pith_short_12","alias_value":"S75TZI3426WE","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_16","alias_value":"S75TZI3426WEKJ4V","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_8","alias_value":"S75TZI34","created_at":"2026-05-18T12:25:49Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:1999:S75TZI3426WEKJ4VZ6NGE67UFR","target":"record","payload":{"canonical_record":{"source":{"id":"quant-ph/9911032","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"quant-ph","submitted_at":"1999-11-08T15:47:10Z","cross_cats_sorted":["physics.optics"],"title_canon_sha256":"5ceca5473a1844a8eb47fc0a9c27b6e8bba855335f228bf82011c5b5a1bba599","abstract_canon_sha256":"5e7ff307cc03f0ad682fd16a01d2d58aa3e82a0bcfef28ae85a3ed03e1cfe437"},"schema_version":"1.0"},"canonical_sha256":"97fb3ca37cd7ac452795cf9a627bf42c4a240dba848e2a51162aed6e50fbf60b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:37:52.232905Z","signature_b64":"+EEinQu8l64DAIYfBz6abDqmQCYMQFmosoE98GGaR19AxX13YnV439gAV5pTEXag5/YKcv/kdiTDGeOjeOPkDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"97fb3ca37cd7ac452795cf9a627bf42c4a240dba848e2a51162aed6e50fbf60b","last_reissued_at":"2026-05-18T01:37:52.232245Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:37:52.232245Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"quant-ph/9911032","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":"2026-05-18T01:37:52Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+WUKGqRiNci/QGlM9oT82ib5vQxmw43xcy/YFykObmNhhVaTd+p1NQ94QFyvba+fcBbQe1/h3NbXARNTo3fjCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-09T10:32:44.993226Z"},"content_sha256":"50fe75e767966e22fd79a0c04108be8a13bf92130cda1732aba7b8b7e450b2ff","schema_version":"1.0","event_id":"sha256:50fe75e767966e22fd79a0c04108be8a13bf92130cda1732aba7b8b7e450b2ff"},{"event_type":"graph_snapshot","subject_pith_number":"pith:1999:S75TZI3426WEKJ4VZ6NGE67UFR","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"An application of two photon entangled states to quantum metrology","license":"","headline":"","cross_cats":["physics.optics"],"primary_cat":"quant-ph","authors_text":"C. Novero, G. Brida, M.Genovese","submitted_at":"1999-11-08T15:47:10Z","abstract_excerpt":"Besides many interesting application to the study of foundations of quantum mechanics, entangled state are now assuming a large relevance for some practical application. In particular, we discuss most recent results obtained in our laboratory on the use of two photons entangled states produced in parametric down conversion for absolute quantum efficiency calibration of photodetectors, in photon counting regime."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"quant-ph/9911032","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":""},"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":"2026-05-18T01:37:52Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EB2wV/d2he6X5EgXiMeR0ff/e0gHd9EkjWmtnH31lg94IF8LYIkMtO1WApNRZAlG7KLTCJLe7yglc3dvAD+7Ag==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-09T10:32:44.993945Z"},"content_sha256":"6ba75026f29d6a28da5b4873e3b58d75f4e0ff9d78bb3ed52e3568c4b2d97e9e","schema_version":"1.0","event_id":"sha256:6ba75026f29d6a28da5b4873e3b58d75f4e0ff9d78bb3ed52e3568c4b2d97e9e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/S75TZI3426WEKJ4VZ6NGE67UFR/bundle.json","state_url":"https://pith.science/pith/S75TZI3426WEKJ4VZ6NGE67UFR/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/S75TZI3426WEKJ4VZ6NGE67UFR/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":"2026-06-09T10:32:44Z","links":{"resolver":"https://pith.science/pith/S75TZI3426WEKJ4VZ6NGE67UFR","bundle":"https://pith.science/pith/S75TZI3426WEKJ4VZ6NGE67UFR/bundle.json","state":"https://pith.science/pith/S75TZI3426WEKJ4VZ6NGE67UFR/state.json","well_known_bundle":"https://pith.science/.well-known/pith/S75TZI3426WEKJ4VZ6NGE67UFR/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:1999:S75TZI3426WEKJ4VZ6NGE67UFR","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":"5e7ff307cc03f0ad682fd16a01d2d58aa3e82a0bcfef28ae85a3ed03e1cfe437","cross_cats_sorted":["physics.optics"],"license":"","primary_cat":"quant-ph","submitted_at":"1999-11-08T15:47:10Z","title_canon_sha256":"5ceca5473a1844a8eb47fc0a9c27b6e8bba855335f228bf82011c5b5a1bba599"},"schema_version":"1.0","source":{"id":"quant-ph/9911032","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"quant-ph/9911032","created_at":"2026-05-18T01:37:52Z"},{"alias_kind":"arxiv_version","alias_value":"quant-ph/9911032v1","created_at":"2026-05-18T01:37:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.quant-ph/9911032","created_at":"2026-05-18T01:37:52Z"},{"alias_kind":"pith_short_12","alias_value":"S75TZI3426WE","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_16","alias_value":"S75TZI3426WEKJ4V","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_8","alias_value":"S75TZI34","created_at":"2026-05-18T12:25:49Z"}],"graph_snapshots":[{"event_id":"sha256:6ba75026f29d6a28da5b4873e3b58d75f4e0ff9d78bb3ed52e3568c4b2d97e9e","target":"graph","created_at":"2026-05-18T01:37:52Z","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":"Besides many interesting application to the study of foundations of quantum mechanics, entangled state are now assuming a large relevance for some practical application. In particular, we discuss most recent results obtained in our laboratory on the use of two photons entangled states produced in parametric down conversion for absolute quantum efficiency calibration of photodetectors, in photon counting regime.","authors_text":"C. Novero, G. Brida, M.Genovese","cross_cats":["physics.optics"],"headline":"","license":"","primary_cat":"quant-ph","submitted_at":"1999-11-08T15:47:10Z","title":"An application of two photon entangled states to quantum metrology"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"quant-ph/9911032","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":"sha256:50fe75e767966e22fd79a0c04108be8a13bf92130cda1732aba7b8b7e450b2ff","target":"record","created_at":"2026-05-18T01:37:52Z","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":"5e7ff307cc03f0ad682fd16a01d2d58aa3e82a0bcfef28ae85a3ed03e1cfe437","cross_cats_sorted":["physics.optics"],"license":"","primary_cat":"quant-ph","submitted_at":"1999-11-08T15:47:10Z","title_canon_sha256":"5ceca5473a1844a8eb47fc0a9c27b6e8bba855335f228bf82011c5b5a1bba599"},"schema_version":"1.0","source":{"id":"quant-ph/9911032","kind":"arxiv","version":1}},"canonical_sha256":"97fb3ca37cd7ac452795cf9a627bf42c4a240dba848e2a51162aed6e50fbf60b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"97fb3ca37cd7ac452795cf9a627bf42c4a240dba848e2a51162aed6e50fbf60b","first_computed_at":"2026-05-18T01:37:52.232245Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:37:52.232245Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"+EEinQu8l64DAIYfBz6abDqmQCYMQFmosoE98GGaR19AxX13YnV439gAV5pTEXag5/YKcv/kdiTDGeOjeOPkDQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:37:52.232905Z","signed_message":"canonical_sha256_bytes"},"source_id":"quant-ph/9911032","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:50fe75e767966e22fd79a0c04108be8a13bf92130cda1732aba7b8b7e450b2ff","sha256:6ba75026f29d6a28da5b4873e3b58d75f4e0ff9d78bb3ed52e3568c4b2d97e9e"],"state_sha256":"19f98cf8d274f777464cf8b60930affd671b6cad4917762ecfaf6726e02dc6a6"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vKmuwX3FgyyIblHnFFGs90c7gkdcTTEI6eR947vMeR37wiRC+uwEEul+D1fy6MXcLIlun4pwFNffNLXCXrheCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-09T10:32:44.997300Z","bundle_sha256":"042b36f0aba00f786c82038a4042dc60c6a19e18a5ee74357128969648c0e7ed"}}