{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:Q3PR3RIZBKY2EB72OM76HBFKGD","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":"07e9b59a0b4d84245b7bcdbc33d0c5b60dcd2d2df18109e39015cb74666a69bc","cross_cats_sorted":["cond-mat.other","cond-mat.str-el"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-09-16T12:39:06Z","title_canon_sha256":"ba6097c6d5b30d2ce32d203a9188c10bc0cd1f51f1d80dbed2dac486bf59161e"},"schema_version":"1.0","source":{"id":"0909.2918","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0909.2918","created_at":"2026-05-18T02:11:47Z"},{"alias_kind":"arxiv_version","alias_value":"0909.2918v3","created_at":"2026-05-18T02:11:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0909.2918","created_at":"2026-05-18T02:11:47Z"},{"alias_kind":"pith_short_12","alias_value":"Q3PR3RIZBKY2","created_at":"2026-05-18T12:26:01Z"},{"alias_kind":"pith_short_16","alias_value":"Q3PR3RIZBKY2EB72","created_at":"2026-05-18T12:26:01Z"},{"alias_kind":"pith_short_8","alias_value":"Q3PR3RIZ","created_at":"2026-05-18T12:26:01Z"}],"graph_snapshots":[{"event_id":"sha256:1bc0e8e068e73e4992644373d427d9745915ad3c30b46e259b16687a2a4a23ac","target":"graph","created_at":"2026-05-18T02:11:47Z","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 study the entanglement properties of a molecular three-qubit system described by the Heisenberg spin Hamiltonian with anisotropic exchange interactions and including an external magnetic field. The system exhibits first order quantum phase transitions by tuning two parameters, $x$ and $y$, of the Hamiltonian to specific values. The three-qubit chain is open ended so that there are two types of pairwise entanglement : nearest-neighbour (n.n.) and next-nearest-neighbour (n.n.n.). We calculate the ground and thermal state concurrences, quantifying pairwise entanglement, as a function of the pa","authors_text":"Amit Kumar Pal, Indrani Bose","cross_cats":["cond-mat.other","cond-mat.str-el"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-09-16T12:39:06Z","title":"Entanglement in a molecular three-qubit system"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0909.2918","kind":"arxiv","version":3},"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":"sha256:65db23bdb6ced2e13cc20bb373001fbfac9af36444e5df824a9923ceb68b86e2","target":"record","created_at":"2026-05-18T02:11:47Z","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":"07e9b59a0b4d84245b7bcdbc33d0c5b60dcd2d2df18109e39015cb74666a69bc","cross_cats_sorted":["cond-mat.other","cond-mat.str-el"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-09-16T12:39:06Z","title_canon_sha256":"ba6097c6d5b30d2ce32d203a9188c10bc0cd1f51f1d80dbed2dac486bf59161e"},"schema_version":"1.0","source":{"id":"0909.2918","kind":"arxiv","version":3}},"canonical_sha256":"86df1dc5190ab1a207fa733fe384aa30ff3889125303654a27befdf810add12e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"86df1dc5190ab1a207fa733fe384aa30ff3889125303654a27befdf810add12e","first_computed_at":"2026-05-18T02:11:47.530952Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:11:47.530952Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"GFf0zjXRQy1fbWEOjZcJlpFIT/ecSxU722CCzyz1epGzMh73EsMRr5ccZ15k3qpCqcvfz0aQ3oh09loYx2WRAg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:11:47.531638Z","signed_message":"canonical_sha256_bytes"},"source_id":"0909.2918","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:65db23bdb6ced2e13cc20bb373001fbfac9af36444e5df824a9923ceb68b86e2","sha256:1bc0e8e068e73e4992644373d427d9745915ad3c30b46e259b16687a2a4a23ac"],"state_sha256":"f4dd952e33fbcfa632f671809d950ee3d6a80db87f8a21e68fb3cead3d63385e"}