{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:D2STHZHYBXGRLNTKFLS5PW7X65","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":"028c9abe0317487c7d1d56bf8c5db1768eb0d3011d41447b44887a15fbcfd8df","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2019-08-22T20:21:42Z","title_canon_sha256":"ca58d5732a6241be6486147fa447a76d780e2578f47343886f9adac7f03c28ae"},"schema_version":"1.0","source":{"id":"1908.08582","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.08582","created_at":"2026-07-05T00:25:14Z"},{"alias_kind":"arxiv_version","alias_value":"1908.08582v2","created_at":"2026-07-05T00:25:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.08582","created_at":"2026-07-05T00:25:14Z"},{"alias_kind":"pith_short_12","alias_value":"D2STHZHYBXGR","created_at":"2026-07-05T00:25:14Z"},{"alias_kind":"pith_short_16","alias_value":"D2STHZHYBXGRLNTK","created_at":"2026-07-05T00:25:14Z"},{"alias_kind":"pith_short_8","alias_value":"D2STHZHY","created_at":"2026-07-05T00:25:14Z"}],"graph_snapshots":[{"event_id":"sha256:b7f2a0d2a0148771834e177b6b0d07328dd7a34d7f4f2700bca81d5632d4d737","target":"graph","created_at":"2026-07-05T00:25:14Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/1908.08582/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We examine the fermionic entanglement in the ground state of the fermionic Lipkin model and its relation with bipartite entanglement. It is first shown that the one-body entanglement entropy, which quantifies the minimum distance to a fermionic Gaussian state, behaves similarly to the mean-field order parameter and is essentially proportional to the total bipartite entanglement between the upper and lower modes, a quantity meaningful only in the fermionic realization of the model. We also analyze the entanglement of the reduced state of four single-particle modes (two up-down pairs), showing t","authors_text":"M. Cerezo, 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":"2019-08-22T20:21:42Z","title":"Fermionic entanglement in the Lipkin model"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.08582","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:baa2f7d859667b64ae1bd39629abb35292897c4ec8a3d2508a1aaa91a7f7de87","target":"record","created_at":"2026-07-05T00:25:14Z","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":"028c9abe0317487c7d1d56bf8c5db1768eb0d3011d41447b44887a15fbcfd8df","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2019-08-22T20:21:42Z","title_canon_sha256":"ca58d5732a6241be6486147fa447a76d780e2578f47343886f9adac7f03c28ae"},"schema_version":"1.0","source":{"id":"1908.08582","kind":"arxiv","version":2}},"canonical_sha256":"1ea533e4f80dcd15b66a2ae5d7dbf7f7576046f6d43201cc5d43735c1dae99d8","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1ea533e4f80dcd15b66a2ae5d7dbf7f7576046f6d43201cc5d43735c1dae99d8","first_computed_at":"2026-07-05T00:25:14.560823Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:25:14.560823Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"MqMkEop7hXvapt1VoiUDaIq0ptb5fVyiWR46NEkbuQDVo6PGOBONsFqxC/QkD9ApgZhvnI93T6vAJPts2EPqCw==","signature_status":"signed_v1","signed_at":"2026-07-05T00:25:14.561345Z","signed_message":"canonical_sha256_bytes"},"source_id":"1908.08582","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:baa2f7d859667b64ae1bd39629abb35292897c4ec8a3d2508a1aaa91a7f7de87","sha256:b7f2a0d2a0148771834e177b6b0d07328dd7a34d7f4f2700bca81d5632d4d737"],"state_sha256":"7881500bbb74849a30ab0a01fb46d8bbd7d1087d8a25b1e14d86765567e59d79"}