{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:WQEGJI37VPZ34HAO2M74EC3WFN","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":"d53469c05664ebba2435f8c184c973440a54ba83a40ac55876d2a4f4b194114a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-09-29T08:30:07Z","title_canon_sha256":"a55bf3ecb8692ecc6a4276761c3e384a20c126539d6d779ef20060bd4c9185c7"},"schema_version":"1.0","source":{"id":"0909.5288","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0909.5288","created_at":"2026-05-18T04:20:14Z"},{"alias_kind":"arxiv_version","alias_value":"0909.5288v1","created_at":"2026-05-18T04:20:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0909.5288","created_at":"2026-05-18T04:20:14Z"},{"alias_kind":"pith_short_12","alias_value":"WQEGJI37VPZ3","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_16","alias_value":"WQEGJI37VPZ34HAO","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_8","alias_value":"WQEGJI37","created_at":"2026-05-18T12:26:02Z"}],"graph_snapshots":[{"event_id":"sha256:28e7c6ed1ec69c702577eded8751e8935211f0d032c677c95062ef294c29d08d","target":"graph","created_at":"2026-05-18T04:20:14Z","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":"With the purpose to introduce a useful tool for researches concerning foundations of quantum mechanics and applications to quantum technologies, here we study three quantumness quantifiers for bipartite optical systems: one based on sub-shot-noise correlations, one related to antibunching and one springing from entanglement determination. The specific cases of parametric down conversion seeded by thermal, coherent and squeezed states are discussed in detail.","authors_text":"G. Brida, I. P. Degiovanni, I. Ruo Berchera, M. Bondani, M. G. A. Paris, M. Genovese, V. Schettini","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-09-29T08:30:07Z","title":"On the discrimination between classical and quantum states"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0909.5288","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:f72b12016c0a56784297e749566d5fc1755ccf647a6f722b7707f06fdaab6325","target":"record","created_at":"2026-05-18T04:20:14Z","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":"d53469c05664ebba2435f8c184c973440a54ba83a40ac55876d2a4f4b194114a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-09-29T08:30:07Z","title_canon_sha256":"a55bf3ecb8692ecc6a4276761c3e384a20c126539d6d779ef20060bd4c9185c7"},"schema_version":"1.0","source":{"id":"0909.5288","kind":"arxiv","version":1}},"canonical_sha256":"b40864a37fabf3be1c0ed33fc20b762b4ff2e088bee681b54f43ec72bfc1807d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b40864a37fabf3be1c0ed33fc20b762b4ff2e088bee681b54f43ec72bfc1807d","first_computed_at":"2026-05-18T04:20:14.788740Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:20:14.788740Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"L3jfJzy2BmCtaP1wtEi3K+/gDaBeR/B8q4VdQaTW6shtNXHxZR2rhDrDetIhQv8/3twX3nEb9Nu9+Gln40KKCA==","signature_status":"signed_v1","signed_at":"2026-05-18T04:20:14.789196Z","signed_message":"canonical_sha256_bytes"},"source_id":"0909.5288","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f72b12016c0a56784297e749566d5fc1755ccf647a6f722b7707f06fdaab6325","sha256:28e7c6ed1ec69c702577eded8751e8935211f0d032c677c95062ef294c29d08d"],"state_sha256":"cb05cd94bdf3919f6a73db7debe6ba7183bfe17434ce2e51375bc20476487643"}