{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:G32PHSCENHI643GJCARRM5KKJA","short_pith_number":"pith:G32PHSCE","canonical_record":{"source":{"id":"1107.2907","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2011-07-14T19:47:23Z","cross_cats_sorted":["quant-ph"],"title_canon_sha256":"a131d97b80288cc7a0159f101518b16bf81504fd2decc976d0ee7993936d6179","abstract_canon_sha256":"07e2b773b1f739bc4fb4f1de21ec87b494f4ab97ffbfd86e4bb947e674bccbed"},"schema_version":"1.0"},"canonical_sha256":"36f4f3c84469d1ee6cc9102316754a48032e04ea8d1e08739d9f4dd016229544","source":{"kind":"arxiv","id":"1107.2907","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1107.2907","created_at":"2026-05-18T03:28:06Z"},{"alias_kind":"arxiv_version","alias_value":"1107.2907v2","created_at":"2026-05-18T03:28:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1107.2907","created_at":"2026-05-18T03:28:06Z"},{"alias_kind":"pith_short_12","alias_value":"G32PHSCENHI6","created_at":"2026-05-18T12:26:28Z"},{"alias_kind":"pith_short_16","alias_value":"G32PHSCENHI643GJ","created_at":"2026-05-18T12:26:28Z"},{"alias_kind":"pith_short_8","alias_value":"G32PHSCE","created_at":"2026-05-18T12:26:28Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:G32PHSCENHI643GJCARRM5KKJA","target":"record","payload":{"canonical_record":{"source":{"id":"1107.2907","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2011-07-14T19:47:23Z","cross_cats_sorted":["quant-ph"],"title_canon_sha256":"a131d97b80288cc7a0159f101518b16bf81504fd2decc976d0ee7993936d6179","abstract_canon_sha256":"07e2b773b1f739bc4fb4f1de21ec87b494f4ab97ffbfd86e4bb947e674bccbed"},"schema_version":"1.0"},"canonical_sha256":"36f4f3c84469d1ee6cc9102316754a48032e04ea8d1e08739d9f4dd016229544","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:28:06.462881Z","signature_b64":"s1pMbce5QYEkYhrcomj60GD4Ju/JhDvWka+QhFELuJMBRoK1NFQ7yKSORgeHXlSL8X1FkQeKS3fLFmuJek3gDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"36f4f3c84469d1ee6cc9102316754a48032e04ea8d1e08739d9f4dd016229544","last_reissued_at":"2026-05-18T03:28:06.462308Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:28:06.462308Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1107.2907","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T03:28:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"tWmdS13rinKWPTDDfGh2tRiExRR1dITxqEjH/+Lxrm2Uwf35dgHOu7+On/tQTZuP2rDVpI/VjiCFpKGzqrRvAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T04:50:35.287519Z"},"content_sha256":"a4e9868001489f8ca5d959d08d06f945ca0b831f6d57562340883040f9db9111","schema_version":"1.0","event_id":"sha256:a4e9868001489f8ca5d959d08d06f945ca0b831f6d57562340883040f9db9111"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:G32PHSCENHI643GJCARRM5KKJA","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Impurity Entanglement in the $J-J_2-\\delta$ Quantum Spin Chain","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["quant-ph"],"primary_cat":"cond-mat.str-el","authors_text":"Andreas Deschner, Erik S. Sorensen","submitted_at":"2011-07-14T19:47:23Z","abstract_excerpt":"The contribution to the entanglement of an impurity attached to one end of a $J-J_2-delta$ quantum spin chain (S=1/2) is studied. Two different measures of the impurity contribution to the entanglement have been proposed: the impurity-entanglement-entropy S_{imp} and the negativity N. The first, S_{imp}, is based on a subtractive procedure where the entanglement-entropy in the absence of the impurity is subtracted from results with the impurity present. The other, N, is the negativity of a part of the system separated from the impurity and the impurity itself. In this paper we compare the two "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1107.2907","kind":"arxiv","version":2},"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":"2026-05-18T03:28:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"A6ADXyACNP5LTgqKB5uBQDE1AlmnUALBIyymY8NpRRLDxcnUgyleeVD7FBx3LpdAS1WV9jM3LOCk/WqUbosxCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T04:50:35.287869Z"},"content_sha256":"4d569537f31d7fd52fded6bca001bc4319f28b083fb693e841468483da49efa5","schema_version":"1.0","event_id":"sha256:4d569537f31d7fd52fded6bca001bc4319f28b083fb693e841468483da49efa5"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/G32PHSCENHI643GJCARRM5KKJA/bundle.json","state_url":"https://pith.science/pith/G32PHSCENHI643GJCARRM5KKJA/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/G32PHSCENHI643GJCARRM5KKJA/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":"2026-06-03T04:50:35Z","links":{"resolver":"https://pith.science/pith/G32PHSCENHI643GJCARRM5KKJA","bundle":"https://pith.science/pith/G32PHSCENHI643GJCARRM5KKJA/bundle.json","state":"https://pith.science/pith/G32PHSCENHI643GJCARRM5KKJA/state.json","well_known_bundle":"https://pith.science/.well-known/pith/G32PHSCENHI643GJCARRM5KKJA/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:G32PHSCENHI643GJCARRM5KKJA","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":"07e2b773b1f739bc4fb4f1de21ec87b494f4ab97ffbfd86e4bb947e674bccbed","cross_cats_sorted":["quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2011-07-14T19:47:23Z","title_canon_sha256":"a131d97b80288cc7a0159f101518b16bf81504fd2decc976d0ee7993936d6179"},"schema_version":"1.0","source":{"id":"1107.2907","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1107.2907","created_at":"2026-05-18T03:28:06Z"},{"alias_kind":"arxiv_version","alias_value":"1107.2907v2","created_at":"2026-05-18T03:28:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1107.2907","created_at":"2026-05-18T03:28:06Z"},{"alias_kind":"pith_short_12","alias_value":"G32PHSCENHI6","created_at":"2026-05-18T12:26:28Z"},{"alias_kind":"pith_short_16","alias_value":"G32PHSCENHI643GJ","created_at":"2026-05-18T12:26:28Z"},{"alias_kind":"pith_short_8","alias_value":"G32PHSCE","created_at":"2026-05-18T12:26:28Z"}],"graph_snapshots":[{"event_id":"sha256:4d569537f31d7fd52fded6bca001bc4319f28b083fb693e841468483da49efa5","target":"graph","created_at":"2026-05-18T03:28:06Z","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":"The contribution to the entanglement of an impurity attached to one end of a $J-J_2-delta$ quantum spin chain (S=1/2) is studied. Two different measures of the impurity contribution to the entanglement have been proposed: the impurity-entanglement-entropy S_{imp} and the negativity N. The first, S_{imp}, is based on a subtractive procedure where the entanglement-entropy in the absence of the impurity is subtracted from results with the impurity present. The other, N, is the negativity of a part of the system separated from the impurity and the impurity itself. In this paper we compare the two ","authors_text":"Andreas Deschner, Erik S. Sorensen","cross_cats":["quant-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2011-07-14T19:47:23Z","title":"Impurity Entanglement in the $J-J_2-\\delta$ Quantum Spin Chain"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1107.2907","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:a4e9868001489f8ca5d959d08d06f945ca0b831f6d57562340883040f9db9111","target":"record","created_at":"2026-05-18T03:28:06Z","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":"07e2b773b1f739bc4fb4f1de21ec87b494f4ab97ffbfd86e4bb947e674bccbed","cross_cats_sorted":["quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2011-07-14T19:47:23Z","title_canon_sha256":"a131d97b80288cc7a0159f101518b16bf81504fd2decc976d0ee7993936d6179"},"schema_version":"1.0","source":{"id":"1107.2907","kind":"arxiv","version":2}},"canonical_sha256":"36f4f3c84469d1ee6cc9102316754a48032e04ea8d1e08739d9f4dd016229544","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"36f4f3c84469d1ee6cc9102316754a48032e04ea8d1e08739d9f4dd016229544","first_computed_at":"2026-05-18T03:28:06.462308Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:28:06.462308Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"s1pMbce5QYEkYhrcomj60GD4Ju/JhDvWka+QhFELuJMBRoK1NFQ7yKSORgeHXlSL8X1FkQeKS3fLFmuJek3gDw==","signature_status":"signed_v1","signed_at":"2026-05-18T03:28:06.462881Z","signed_message":"canonical_sha256_bytes"},"source_id":"1107.2907","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a4e9868001489f8ca5d959d08d06f945ca0b831f6d57562340883040f9db9111","sha256:4d569537f31d7fd52fded6bca001bc4319f28b083fb693e841468483da49efa5"],"state_sha256":"023fe15c737f05d30ec3cf2f987b9d8b6298f2febb5966ea28b5a11063499f78"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DVB/F7vKTVGPEaqiiFITd7/1FoXYxl9DnIEyH8CaxCh2HV+1akWFxOkpfQZXwRKdknA2bLbgUY2hvXGlgd8DDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-03T04:50:35.289811Z","bundle_sha256":"3eae3d6c849f9f692dd3c2f424342bb2999fd76ea16241373cd00ae610d6ff12"}}