{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2003:U4FTLVH4NGCNCDPXMR725DMB5V","short_pith_number":"pith:U4FTLVH4","canonical_record":{"source":{"id":"quant-ph/0303157","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"quant-ph","submitted_at":"2003-03-26T00:27:52Z","cross_cats_sorted":[],"title_canon_sha256":"73af48de709ba8142d6ccf389b0424b79c6bcb4444dfb3ce76406dd6e7d5b251","abstract_canon_sha256":"f261863678b929ff36e8d13576dacbfdb1e5b0f70fb41e0121e555dbb2e8ea7b"},"schema_version":"1.0"},"canonical_sha256":"a70b35d4fc6984d10df7647fae8d81ed41eefdb7f8082ff0b19a698799cdfa83","source":{"kind":"arxiv","id":"quant-ph/0303157","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"quant-ph/0303157","created_at":"2026-05-18T01:05:04Z"},{"alias_kind":"arxiv_version","alias_value":"quant-ph/0303157v1","created_at":"2026-05-18T01:05:04Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.quant-ph/0303157","created_at":"2026-05-18T01:05:04Z"},{"alias_kind":"pith_short_12","alias_value":"U4FTLVH4NGCN","created_at":"2026-05-18T12:25:52Z"},{"alias_kind":"pith_short_16","alias_value":"U4FTLVH4NGCNCDPX","created_at":"2026-05-18T12:25:52Z"},{"alias_kind":"pith_short_8","alias_value":"U4FTLVH4","created_at":"2026-05-18T12:25:52Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2003:U4FTLVH4NGCNCDPXMR725DMB5V","target":"record","payload":{"canonical_record":{"source":{"id":"quant-ph/0303157","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"quant-ph","submitted_at":"2003-03-26T00:27:52Z","cross_cats_sorted":[],"title_canon_sha256":"73af48de709ba8142d6ccf389b0424b79c6bcb4444dfb3ce76406dd6e7d5b251","abstract_canon_sha256":"f261863678b929ff36e8d13576dacbfdb1e5b0f70fb41e0121e555dbb2e8ea7b"},"schema_version":"1.0"},"canonical_sha256":"a70b35d4fc6984d10df7647fae8d81ed41eefdb7f8082ff0b19a698799cdfa83","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:05:04.059961Z","signature_b64":"9HGE7+i1SQsRr3jS2bBSyroX75TjC8XFwAi5pmGOmtWoCNeAS8ZMx2KdHY+FMYnlrVprY9OKNeS4lI0/ftt3Dw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a70b35d4fc6984d10df7647fae8d81ed41eefdb7f8082ff0b19a698799cdfa83","last_reissued_at":"2026-05-18T01:05:04.059443Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:05:04.059443Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"quant-ph/0303157","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":"2026-05-18T01:05:04Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EVz4jLrctqA4Li7mjH68N51qQpUsYlwibFbgMyRN+m0Qg7Wr2XL7eEvJU1Bm4/DHMRjK+AN4YMx7a7WK7HgPDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-24T20:45:43.248519Z"},"content_sha256":"8554ee97600cc01c35f0ae797ac1310784d7a1a60aa8d92043e9c9b3b946c26b","schema_version":"1.0","event_id":"sha256:8554ee97600cc01c35f0ae797ac1310784d7a1a60aa8d92043e9c9b3b946c26b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2003:U4FTLVH4NGCNCDPXMR725DMB5V","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Entanglement in quantum computers described by the XXZ model with defects","license":"","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"L. F. Santos","submitted_at":"2003-03-26T00:27:52Z","abstract_excerpt":"We investigate how to generate maximally entangled states in systems characterized by the Hamiltonian of the XXZ model with defects. Some proposed quantum computers are described by such model. We show how the defects can be used to obtain EPR states and W states when one or two excitations are considered."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"quant-ph/0303157","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":"2026-05-18T01:05:04Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"O/h+GLOMH48BTLTJXHTUb0f0yiLk6ORmwQsy9BtvS8TsUf2wNHs3SK5Qb1d+TUcejVC987zTg8EeeYzy3zWdDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-24T20:45:43.248877Z"},"content_sha256":"1f106ee86be0bb274dada4586f635ee0de05db6d67e56f99818952e56a2605da","schema_version":"1.0","event_id":"sha256:1f106ee86be0bb274dada4586f635ee0de05db6d67e56f99818952e56a2605da"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/U4FTLVH4NGCNCDPXMR725DMB5V/bundle.json","state_url":"https://pith.science/pith/U4FTLVH4NGCNCDPXMR725DMB5V/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/U4FTLVH4NGCNCDPXMR725DMB5V/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":"2026-06-24T20:45:43Z","links":{"resolver":"https://pith.science/pith/U4FTLVH4NGCNCDPXMR725DMB5V","bundle":"https://pith.science/pith/U4FTLVH4NGCNCDPXMR725DMB5V/bundle.json","state":"https://pith.science/pith/U4FTLVH4NGCNCDPXMR725DMB5V/state.json","well_known_bundle":"https://pith.science/.well-known/pith/U4FTLVH4NGCNCDPXMR725DMB5V/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2003:U4FTLVH4NGCNCDPXMR725DMB5V","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":"f261863678b929ff36e8d13576dacbfdb1e5b0f70fb41e0121e555dbb2e8ea7b","cross_cats_sorted":[],"license":"","primary_cat":"quant-ph","submitted_at":"2003-03-26T00:27:52Z","title_canon_sha256":"73af48de709ba8142d6ccf389b0424b79c6bcb4444dfb3ce76406dd6e7d5b251"},"schema_version":"1.0","source":{"id":"quant-ph/0303157","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"quant-ph/0303157","created_at":"2026-05-18T01:05:04Z"},{"alias_kind":"arxiv_version","alias_value":"quant-ph/0303157v1","created_at":"2026-05-18T01:05:04Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.quant-ph/0303157","created_at":"2026-05-18T01:05:04Z"},{"alias_kind":"pith_short_12","alias_value":"U4FTLVH4NGCN","created_at":"2026-05-18T12:25:52Z"},{"alias_kind":"pith_short_16","alias_value":"U4FTLVH4NGCNCDPX","created_at":"2026-05-18T12:25:52Z"},{"alias_kind":"pith_short_8","alias_value":"U4FTLVH4","created_at":"2026-05-18T12:25:52Z"}],"graph_snapshots":[{"event_id":"sha256:1f106ee86be0bb274dada4586f635ee0de05db6d67e56f99818952e56a2605da","target":"graph","created_at":"2026-05-18T01:05:04Z","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 investigate how to generate maximally entangled states in systems characterized by the Hamiltonian of the XXZ model with defects. Some proposed quantum computers are described by such model. We show how the defects can be used to obtain EPR states and W states when one or two excitations are considered.","authors_text":"L. F. Santos","cross_cats":[],"headline":"","license":"","primary_cat":"quant-ph","submitted_at":"2003-03-26T00:27:52Z","title":"Entanglement in quantum computers described by the XXZ model with defects"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"quant-ph/0303157","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":"sha256:8554ee97600cc01c35f0ae797ac1310784d7a1a60aa8d92043e9c9b3b946c26b","target":"record","created_at":"2026-05-18T01:05:04Z","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":"f261863678b929ff36e8d13576dacbfdb1e5b0f70fb41e0121e555dbb2e8ea7b","cross_cats_sorted":[],"license":"","primary_cat":"quant-ph","submitted_at":"2003-03-26T00:27:52Z","title_canon_sha256":"73af48de709ba8142d6ccf389b0424b79c6bcb4444dfb3ce76406dd6e7d5b251"},"schema_version":"1.0","source":{"id":"quant-ph/0303157","kind":"arxiv","version":1}},"canonical_sha256":"a70b35d4fc6984d10df7647fae8d81ed41eefdb7f8082ff0b19a698799cdfa83","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a70b35d4fc6984d10df7647fae8d81ed41eefdb7f8082ff0b19a698799cdfa83","first_computed_at":"2026-05-18T01:05:04.059443Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:05:04.059443Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"9HGE7+i1SQsRr3jS2bBSyroX75TjC8XFwAi5pmGOmtWoCNeAS8ZMx2KdHY+FMYnlrVprY9OKNeS4lI0/ftt3Dw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:05:04.059961Z","signed_message":"canonical_sha256_bytes"},"source_id":"quant-ph/0303157","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8554ee97600cc01c35f0ae797ac1310784d7a1a60aa8d92043e9c9b3b946c26b","sha256:1f106ee86be0bb274dada4586f635ee0de05db6d67e56f99818952e56a2605da"],"state_sha256":"445e1f5dca2ae905976c112cd93ba05abe98f39d93209022e9969832edaf9677"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jb1gCcqezbfnVfdLSTrKD9ztoaW5Mexk70qVSnnshUS+/ToiAAhc7DJjg4FJ088sO7TKfzb4UPIdfKIIQIcoCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-24T20:45:43.250818Z","bundle_sha256":"8818ffb16ef0c66339971b9e492053e215ca0cf03ec3a8725eb71a88ca352a08"}}