{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:NB5HLORJU3IIHKWWWLNT5PFV3M","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":"32cc3ccb6c2d734133691d44e08ecf75c61091b9dc2bc38c5502b87d584ede9c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2013-09-13T19:57:02Z","title_canon_sha256":"68098bbccee44fb02e22dfd61b227270eebd871122c13e67e1e1573bbddb80c4"},"schema_version":"1.0","source":{"id":"1309.3555","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1309.3555","created_at":"2026-05-18T02:29:53Z"},{"alias_kind":"arxiv_version","alias_value":"1309.3555v2","created_at":"2026-05-18T02:29:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1309.3555","created_at":"2026-05-18T02:29:53Z"},{"alias_kind":"pith_short_12","alias_value":"NB5HLORJU3II","created_at":"2026-05-18T12:27:52Z"},{"alias_kind":"pith_short_16","alias_value":"NB5HLORJU3IIHKWW","created_at":"2026-05-18T12:27:52Z"},{"alias_kind":"pith_short_8","alias_value":"NB5HLORJ","created_at":"2026-05-18T12:27:52Z"}],"graph_snapshots":[{"event_id":"sha256:f12a548807241aee4a725ba7d390ede8aee058f9b8bf6b509707147edf1fed20","target":"graph","created_at":"2026-05-18T02:29:53Z","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 evolution of the set of Bell diagonal states for a two-qubit system coupled to two independent vacuum noise sources. This set can be represented geometrically as the set of points inside a tetrahedron in a three-dimensional Euclidean space and contains the maximally entangled states for bipartite systems. We show that the set of entangled Bell diagonal states can be divided into two bounded subsets in this representation: states that evolve into separable states in a finite time and states that lose their entanglement asymptotically. Additionally, we find that the fin","authors_text":"Douglas Mundarain, Esteban Isasi, Rams\\'es S\\'anchez","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2013-09-13T19:57:02Z","title":"Entanglement sudden-death time: a geometric quantity"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1309.3555","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:da78821d567c3bddd2dcacc1ae82d1faaf63a2027ec22432dda51a594c4db75d","target":"record","created_at":"2026-05-18T02:29:53Z","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":"32cc3ccb6c2d734133691d44e08ecf75c61091b9dc2bc38c5502b87d584ede9c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2013-09-13T19:57:02Z","title_canon_sha256":"68098bbccee44fb02e22dfd61b227270eebd871122c13e67e1e1573bbddb80c4"},"schema_version":"1.0","source":{"id":"1309.3555","kind":"arxiv","version":2}},"canonical_sha256":"687a75ba29a6d083aad6b2db3ebcb5db3dcb2dd88d51c05d010ff3e516fad400","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"687a75ba29a6d083aad6b2db3ebcb5db3dcb2dd88d51c05d010ff3e516fad400","first_computed_at":"2026-05-18T02:29:53.223080Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:29:53.223080Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"kOmst9UNm4LOXRPRUT8oDZEj3rwgYf/HKtP0uPPsIMN2AWJt1ip3DAKzO3ss7s7vrnnsuH6OBDBnYrr4bsOMCA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:29:53.223581Z","signed_message":"canonical_sha256_bytes"},"source_id":"1309.3555","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:da78821d567c3bddd2dcacc1ae82d1faaf63a2027ec22432dda51a594c4db75d","sha256:f12a548807241aee4a725ba7d390ede8aee058f9b8bf6b509707147edf1fed20"],"state_sha256":"2f408a09b40402c2a3289df845f8ac0773bdd049bdfc93fa03b83b8065e4e974"}