{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:G7RM33I7QGQAQMWK5ESK6IWPUS","short_pith_number":"pith:G7RM33I7","canonical_record":{"source":{"id":"1112.1279","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2011-12-06T14:04:08Z","cross_cats_sorted":[],"title_canon_sha256":"aecef992371ae104df8657375f5a94c65c80f2ad43385060edce8838996de817","abstract_canon_sha256":"f8787122d8c59f2f6984db95b3226ccd22173086b57163c23f9355ec7d26cdac"},"schema_version":"1.0"},"canonical_sha256":"37e2cded1f81a00832cae924af22cfa4a90dc632e59d1fbd7d3b55cfc6227047","source":{"kind":"arxiv","id":"1112.1279","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1112.1279","created_at":"2026-05-18T01:59:16Z"},{"alias_kind":"arxiv_version","alias_value":"1112.1279v1","created_at":"2026-05-18T01:59:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1112.1279","created_at":"2026-05-18T01:59:16Z"},{"alias_kind":"pith_short_12","alias_value":"G7RM33I7QGQA","created_at":"2026-05-18T12:26:28Z"},{"alias_kind":"pith_short_16","alias_value":"G7RM33I7QGQAQMWK","created_at":"2026-05-18T12:26:28Z"},{"alias_kind":"pith_short_8","alias_value":"G7RM33I7","created_at":"2026-05-18T12:26:28Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:G7RM33I7QGQAQMWK5ESK6IWPUS","target":"record","payload":{"canonical_record":{"source":{"id":"1112.1279","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2011-12-06T14:04:08Z","cross_cats_sorted":[],"title_canon_sha256":"aecef992371ae104df8657375f5a94c65c80f2ad43385060edce8838996de817","abstract_canon_sha256":"f8787122d8c59f2f6984db95b3226ccd22173086b57163c23f9355ec7d26cdac"},"schema_version":"1.0"},"canonical_sha256":"37e2cded1f81a00832cae924af22cfa4a90dc632e59d1fbd7d3b55cfc6227047","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:59:16.468151Z","signature_b64":"H/8+ppAmzTSWtb9/tLCiu5fziMsD9CD/VIw/CkBhNgJDMiLjX9gD0rx5KZ0EZkwtqSBM59imTIG0oLbYmFsZCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"37e2cded1f81a00832cae924af22cfa4a90dc632e59d1fbd7d3b55cfc6227047","last_reissued_at":"2026-05-18T01:59:16.467394Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:59:16.467394Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1112.1279","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:59:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"hhz0RVzoDAogk7qcmXTSfTd7ZunM0VQ99f80qpN0N/KAKP3wzZaudtYYRb0Mwzx5YQkXAaSKSd/LzYbG6955Ag==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T19:11:44.483984Z"},"content_sha256":"d33030624c66f9270057954eaaf9e8199006ecdef128793b66905ed4ca5f23f0","schema_version":"1.0","event_id":"sha256:d33030624c66f9270057954eaaf9e8199006ecdef128793b66905ed4ca5f23f0"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:G7RM33I7QGQAQMWK5ESK6IWPUS","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Global entanglement in XXZ chains","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"N. Canosa, R. Rossignoli","submitted_at":"2011-12-06T14:04:08Z","abstract_excerpt":"We examine the thermal entanglement of XXZ-type Heisenberg chains in the presence of a uniform magnetic field along the z axes, through the evaluation of the negativity associated with bipartitions of the whole system and subsystems. Limit temperatures for non-zero global negativities are shown to depend on the asymmetry $\\Delta$ but not on the uniform field, and can be much higher than those limiting pairwise entanglement. It is also shown that global bipartite entanglement may exist for T>0 even for $\\Delta\\geq 1$, i.e., when the system is fully aligned (and hence separable) at T=0, and that"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1112.1279","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:59:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"hSiIGM9Fzzs4wotakyFGgCJe9bd+qRm6sFCg/2O4/d3Qdso14ffhWYaUfo8ODSJI40wJtD9srXi0w+Mnyic4Cw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T19:11:44.484768Z"},"content_sha256":"0cc8671679c1126d9f4a3af0ed564c58b4e5593239144b5d7cc9f7406d6df0c8","schema_version":"1.0","event_id":"sha256:0cc8671679c1126d9f4a3af0ed564c58b4e5593239144b5d7cc9f7406d6df0c8"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/G7RM33I7QGQAQMWK5ESK6IWPUS/bundle.json","state_url":"https://pith.science/pith/G7RM33I7QGQAQMWK5ESK6IWPUS/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/G7RM33I7QGQAQMWK5ESK6IWPUS/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-05-31T19:11:44Z","links":{"resolver":"https://pith.science/pith/G7RM33I7QGQAQMWK5ESK6IWPUS","bundle":"https://pith.science/pith/G7RM33I7QGQAQMWK5ESK6IWPUS/bundle.json","state":"https://pith.science/pith/G7RM33I7QGQAQMWK5ESK6IWPUS/state.json","well_known_bundle":"https://pith.science/.well-known/pith/G7RM33I7QGQAQMWK5ESK6IWPUS/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:G7RM33I7QGQAQMWK5ESK6IWPUS","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":"f8787122d8c59f2f6984db95b3226ccd22173086b57163c23f9355ec7d26cdac","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2011-12-06T14:04:08Z","title_canon_sha256":"aecef992371ae104df8657375f5a94c65c80f2ad43385060edce8838996de817"},"schema_version":"1.0","source":{"id":"1112.1279","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1112.1279","created_at":"2026-05-18T01:59:16Z"},{"alias_kind":"arxiv_version","alias_value":"1112.1279v1","created_at":"2026-05-18T01:59:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1112.1279","created_at":"2026-05-18T01:59:16Z"},{"alias_kind":"pith_short_12","alias_value":"G7RM33I7QGQA","created_at":"2026-05-18T12:26:28Z"},{"alias_kind":"pith_short_16","alias_value":"G7RM33I7QGQAQMWK","created_at":"2026-05-18T12:26:28Z"},{"alias_kind":"pith_short_8","alias_value":"G7RM33I7","created_at":"2026-05-18T12:26:28Z"}],"graph_snapshots":[{"event_id":"sha256:0cc8671679c1126d9f4a3af0ed564c58b4e5593239144b5d7cc9f7406d6df0c8","target":"graph","created_at":"2026-05-18T01:59:16Z","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 the thermal entanglement of XXZ-type Heisenberg chains in the presence of a uniform magnetic field along the z axes, through the evaluation of the negativity associated with bipartitions of the whole system and subsystems. Limit temperatures for non-zero global negativities are shown to depend on the asymmetry $\\Delta$ but not on the uniform field, and can be much higher than those limiting pairwise entanglement. It is also shown that global bipartite entanglement may exist for T>0 even for $\\Delta\\geq 1$, i.e., when the system is fully aligned (and hence separable) at T=0, and that","authors_text":"N. Canosa, R. Rossignoli","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2011-12-06T14:04:08Z","title":"Global entanglement in XXZ chains"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1112.1279","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:d33030624c66f9270057954eaaf9e8199006ecdef128793b66905ed4ca5f23f0","target":"record","created_at":"2026-05-18T01:59:16Z","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":"f8787122d8c59f2f6984db95b3226ccd22173086b57163c23f9355ec7d26cdac","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2011-12-06T14:04:08Z","title_canon_sha256":"aecef992371ae104df8657375f5a94c65c80f2ad43385060edce8838996de817"},"schema_version":"1.0","source":{"id":"1112.1279","kind":"arxiv","version":1}},"canonical_sha256":"37e2cded1f81a00832cae924af22cfa4a90dc632e59d1fbd7d3b55cfc6227047","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"37e2cded1f81a00832cae924af22cfa4a90dc632e59d1fbd7d3b55cfc6227047","first_computed_at":"2026-05-18T01:59:16.467394Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:59:16.467394Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"H/8+ppAmzTSWtb9/tLCiu5fziMsD9CD/VIw/CkBhNgJDMiLjX9gD0rx5KZ0EZkwtqSBM59imTIG0oLbYmFsZCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:59:16.468151Z","signed_message":"canonical_sha256_bytes"},"source_id":"1112.1279","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d33030624c66f9270057954eaaf9e8199006ecdef128793b66905ed4ca5f23f0","sha256:0cc8671679c1126d9f4a3af0ed564c58b4e5593239144b5d7cc9f7406d6df0c8"],"state_sha256":"a8b9bf1508c09041b931539c3fb67d2987d044def751dd616805205de708a927"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7gg4Nkqq/bvz2105gOBSeMHywdKTLXaag9/IkH8M1BdrjbwebsbilWdHi9Xf1Gp7zAFx++ncs9WINhmuMZxSAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T19:11:44.488761Z","bundle_sha256":"2a1d354cc4cfc9a5796c4d58aa8efed6736308ddccebc3516f3c6df71c1ab8cd"}}