{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2008:LXISVHJ5QIGFYFAI7MYQWJZQMX","short_pith_number":"pith:LXISVHJ5","canonical_record":{"source":{"id":"0804.3794","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2008-04-23T21:08:32Z","cross_cats_sorted":[],"title_canon_sha256":"50653b53dd57a2208543ab6daafac8f6688df27007cdab60125b8b5312fbeb3f","abstract_canon_sha256":"a5434687ddf6b992adfa97b75511c86dff947c6ac8875a0a8c37e42d921fbaea"},"schema_version":"1.0"},"canonical_sha256":"5dd12a9d3d820c5c1408fb310b273065e3d2bcdce99404c41fc9d223a7b13c6a","source":{"kind":"arxiv","id":"0804.3794","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0804.3794","created_at":"2026-05-18T04:23:10Z"},{"alias_kind":"arxiv_version","alias_value":"0804.3794v2","created_at":"2026-05-18T04:23:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0804.3794","created_at":"2026-05-18T04:23:10Z"},{"alias_kind":"pith_short_12","alias_value":"LXISVHJ5QIGF","created_at":"2026-05-18T12:25:57Z"},{"alias_kind":"pith_short_16","alias_value":"LXISVHJ5QIGFYFAI","created_at":"2026-05-18T12:25:57Z"},{"alias_kind":"pith_short_8","alias_value":"LXISVHJ5","created_at":"2026-05-18T12:25:57Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2008:LXISVHJ5QIGFYFAI7MYQWJZQMX","target":"record","payload":{"canonical_record":{"source":{"id":"0804.3794","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2008-04-23T21:08:32Z","cross_cats_sorted":[],"title_canon_sha256":"50653b53dd57a2208543ab6daafac8f6688df27007cdab60125b8b5312fbeb3f","abstract_canon_sha256":"a5434687ddf6b992adfa97b75511c86dff947c6ac8875a0a8c37e42d921fbaea"},"schema_version":"1.0"},"canonical_sha256":"5dd12a9d3d820c5c1408fb310b273065e3d2bcdce99404c41fc9d223a7b13c6a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:23:10.834798Z","signature_b64":"QZY5l9pdiz/0PHj5t1GbY2XOUxDjAjZQxUA+LpZwEdf6CZ5ecL6yMsSoZg4l7F3Ff9ZCfYn3hSbDlV5QwSTaCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5dd12a9d3d820c5c1408fb310b273065e3d2bcdce99404c41fc9d223a7b13c6a","last_reissued_at":"2026-05-18T04:23:10.834307Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:23:10.834307Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0804.3794","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":"2026-05-18T04:23:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6fPyYPI98RaPwfeB/lV/54G04S1K+Rvl4TL8D3RIbfKIV+TgW4bSiEHaLd6kxGsL0okCtb8rYw2opLBSKW6+CA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-23T21:05:12.394744Z"},"content_sha256":"82949395566917fad51b678645e966aeb485cf8d9358f2c93830bcaace646ea3","schema_version":"1.0","event_id":"sha256:82949395566917fad51b678645e966aeb485cf8d9358f2c93830bcaace646ea3"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2008:LXISVHJ5QIGFYFAI7MYQWJZQMX","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Abruption decay of entanglement and quantum communication through noise channels","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Nasser Metwally","submitted_at":"2008-04-23T21:08:32Z","abstract_excerpt":"We investigate the dynamics of two qubits state through the Bloch channel.\n  It is found that the degradation and sudden-death of the entanglement depend on the channel's parameters and the structure of the input state. Starting from partially entangled states as input state, the output states are more robust compared with those obtained from initial maximally entangled states. Also the survivability of entanglement increased as the absolute equilibrium values of the channel increased or the ratio between the longitudinal and transverse relaxation times gets smaller. Ability of using the outpu"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0804.3794","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":"2026-05-18T04:23:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"IAz8qakzRfeNoFcObie6xElW7ZLo3s3LKmGQaeprzt6gXzdxozMxVZYHpTVAjVwMMFR8zQIfXoeV9wEjghtpDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-23T21:05:12.395092Z"},"content_sha256":"bab44cffc8b7a3134fb77159bc839dd5a8f4634c7ed54c690b0276d05962f6a8","schema_version":"1.0","event_id":"sha256:bab44cffc8b7a3134fb77159bc839dd5a8f4634c7ed54c690b0276d05962f6a8"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/LXISVHJ5QIGFYFAI7MYQWJZQMX/bundle.json","state_url":"https://pith.science/pith/LXISVHJ5QIGFYFAI7MYQWJZQMX/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/LXISVHJ5QIGFYFAI7MYQWJZQMX/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":"2026-06-23T21:05:12Z","links":{"resolver":"https://pith.science/pith/LXISVHJ5QIGFYFAI7MYQWJZQMX","bundle":"https://pith.science/pith/LXISVHJ5QIGFYFAI7MYQWJZQMX/bundle.json","state":"https://pith.science/pith/LXISVHJ5QIGFYFAI7MYQWJZQMX/state.json","well_known_bundle":"https://pith.science/.well-known/pith/LXISVHJ5QIGFYFAI7MYQWJZQMX/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2008:LXISVHJ5QIGFYFAI7MYQWJZQMX","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":"a5434687ddf6b992adfa97b75511c86dff947c6ac8875a0a8c37e42d921fbaea","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2008-04-23T21:08:32Z","title_canon_sha256":"50653b53dd57a2208543ab6daafac8f6688df27007cdab60125b8b5312fbeb3f"},"schema_version":"1.0","source":{"id":"0804.3794","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0804.3794","created_at":"2026-05-18T04:23:10Z"},{"alias_kind":"arxiv_version","alias_value":"0804.3794v2","created_at":"2026-05-18T04:23:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0804.3794","created_at":"2026-05-18T04:23:10Z"},{"alias_kind":"pith_short_12","alias_value":"LXISVHJ5QIGF","created_at":"2026-05-18T12:25:57Z"},{"alias_kind":"pith_short_16","alias_value":"LXISVHJ5QIGFYFAI","created_at":"2026-05-18T12:25:57Z"},{"alias_kind":"pith_short_8","alias_value":"LXISVHJ5","created_at":"2026-05-18T12:25:57Z"}],"graph_snapshots":[{"event_id":"sha256:bab44cffc8b7a3134fb77159bc839dd5a8f4634c7ed54c690b0276d05962f6a8","target":"graph","created_at":"2026-05-18T04:23:10Z","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 the dynamics of two qubits state through the Bloch channel.\n  It is found that the degradation and sudden-death of the entanglement depend on the channel's parameters and the structure of the input state. Starting from partially entangled states as input state, the output states are more robust compared with those obtained from initial maximally entangled states. Also the survivability of entanglement increased as the absolute equilibrium values of the channel increased or the ratio between the longitudinal and transverse relaxation times gets smaller. Ability of using the outpu","authors_text":"Nasser Metwally","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2008-04-23T21:08:32Z","title":"Abruption decay of entanglement and quantum communication through noise channels"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0804.3794","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":"sha256:82949395566917fad51b678645e966aeb485cf8d9358f2c93830bcaace646ea3","target":"record","created_at":"2026-05-18T04:23:10Z","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":"a5434687ddf6b992adfa97b75511c86dff947c6ac8875a0a8c37e42d921fbaea","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2008-04-23T21:08:32Z","title_canon_sha256":"50653b53dd57a2208543ab6daafac8f6688df27007cdab60125b8b5312fbeb3f"},"schema_version":"1.0","source":{"id":"0804.3794","kind":"arxiv","version":2}},"canonical_sha256":"5dd12a9d3d820c5c1408fb310b273065e3d2bcdce99404c41fc9d223a7b13c6a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5dd12a9d3d820c5c1408fb310b273065e3d2bcdce99404c41fc9d223a7b13c6a","first_computed_at":"2026-05-18T04:23:10.834307Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:23:10.834307Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"QZY5l9pdiz/0PHj5t1GbY2XOUxDjAjZQxUA+LpZwEdf6CZ5ecL6yMsSoZg4l7F3Ff9ZCfYn3hSbDlV5QwSTaCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T04:23:10.834798Z","signed_message":"canonical_sha256_bytes"},"source_id":"0804.3794","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:82949395566917fad51b678645e966aeb485cf8d9358f2c93830bcaace646ea3","sha256:bab44cffc8b7a3134fb77159bc839dd5a8f4634c7ed54c690b0276d05962f6a8"],"state_sha256":"31a58dcd6914543fab9a9e1966cd7c5a0be7c5c7b56da7c1e04c923ef1b03419"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zG1RXVmdd9eeuDd0AvaDyHRqKENe4MzBBMphIu0cpMNOZkKZjubFl8//i4O7OMWqHK0BgmMak5CsXi8ML/guBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-23T21:05:12.396986Z","bundle_sha256":"3716108a3adecf2f4b9cea8f56da2d11e511b83234853575b01d6d01dd960aaf"}}