{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:7ISGYPNA6TC6AQ44FVTX3AY2KR","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":"a0b0b85c8e7214e030b392f0478718a838335dc7795bc49acfee6a858dd56c02","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2018-03-23T16:57:24Z","title_canon_sha256":"8e950616a731371dcd3af99c4fc9d497573d1c0210ffd53ca3e7d0f7fa3ff89c"},"schema_version":"1.0","source":{"id":"1803.08883","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1803.08883","created_at":"2026-05-18T00:12:52Z"},{"alias_kind":"arxiv_version","alias_value":"1803.08883v2","created_at":"2026-05-18T00:12:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1803.08883","created_at":"2026-05-18T00:12:52Z"},{"alias_kind":"pith_short_12","alias_value":"7ISGYPNA6TC6","created_at":"2026-05-18T12:32:11Z"},{"alias_kind":"pith_short_16","alias_value":"7ISGYPNA6TC6AQ44","created_at":"2026-05-18T12:32:11Z"},{"alias_kind":"pith_short_8","alias_value":"7ISGYPNA","created_at":"2026-05-18T12:32:11Z"}],"graph_snapshots":[{"event_id":"sha256:9d5b814dffb1bfb14ad4ae96d8bcd91316d81a36ed48715f17263b5fd5178882","target":"graph","created_at":"2026-05-18T00:12:52Z","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":"We examine distinct measures of fermionic entanglement in the exact ground state of a finite superconducting system. It is first shown that global measures such as the one-body entanglement entropy, which represents the minimum relative entropy between the exact ground state and the set of fermionic gaussian states, exhibit a close correlation with the BCS gap, saturating in the strong superconducting regime. The same behavior is displayed by the bipartite entanglement between the set of all single particle states $k$ of positive quasimomenta and their time reversed partners $\\bar{k}$. In cont","authors_text":"M. Di Tullio, N. Gigena, R. Rossignoli","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2018-03-23T16:57:24Z","title":"Fermionic Entanglement in Superconducting Systems"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1803.08883","kind":"arxiv","version":2},"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":"sha256:67ee56004880aab8a79ea56d2fbae08657f8cfae85bbb11c06e4f1b8655d9086","target":"record","created_at":"2026-05-18T00:12:52Z","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":"a0b0b85c8e7214e030b392f0478718a838335dc7795bc49acfee6a858dd56c02","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2018-03-23T16:57:24Z","title_canon_sha256":"8e950616a731371dcd3af99c4fc9d497573d1c0210ffd53ca3e7d0f7fa3ff89c"},"schema_version":"1.0","source":{"id":"1803.08883","kind":"arxiv","version":2}},"canonical_sha256":"fa246c3da0f4c5e0439c2d677d831a546fc39ea09d92f548c4f01cf32986900c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"fa246c3da0f4c5e0439c2d677d831a546fc39ea09d92f548c4f01cf32986900c","first_computed_at":"2026-05-18T00:12:52.662934Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:12:52.662934Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"T1nai2xV0yhynEfjAbFzSdqwMTNw8yVK2TQ5lVLLwVwiYoRcd1WbAhudY2+UAeclN5ZCgEJ8pl2sppgvFhRnBA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:12:52.663445Z","signed_message":"canonical_sha256_bytes"},"source_id":"1803.08883","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:67ee56004880aab8a79ea56d2fbae08657f8cfae85bbb11c06e4f1b8655d9086","sha256:9d5b814dffb1bfb14ad4ae96d8bcd91316d81a36ed48715f17263b5fd5178882"],"state_sha256":"d70220bdbf29227850bd74e1370769be313055fa834d936d32531e8d6d5c1b62"}