{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:1999:JYKLTWKSEODACSRUQIK3G75KEQ","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":"f16839831df419d297ec0d3793be6f9bc1152e075f3f1d21b36e6826b9bdd850","cross_cats_sorted":[],"license":"","primary_cat":"quant-ph","submitted_at":"1999-03-09T15:56:36Z","title_canon_sha256":"fd0acf971922b6238058fb7efb3814d8670136b0199c9f1152572b527d0eb399"},"schema_version":"1.0","source":{"id":"quant-ph/9903033","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"quant-ph/9903033","created_at":"2026-05-18T01:37:52Z"},{"alias_kind":"arxiv_version","alias_value":"quant-ph/9903033v2","created_at":"2026-05-18T01:37:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.quant-ph/9903033","created_at":"2026-05-18T01:37:52Z"},{"alias_kind":"pith_short_12","alias_value":"JYKLTWKSEODA","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_16","alias_value":"JYKLTWKSEODACSRU","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_8","alias_value":"JYKLTWKS","created_at":"2026-05-18T12:25:49Z"}],"graph_snapshots":[{"event_id":"sha256:25d2a4c4689d56529626572814db9eca904555227bd56a75916676028fa4861b","target":"graph","created_at":"2026-05-18T01:37:52Z","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 analyse the role of entanglement for transmission of classical information through a memoryless depolarising channel. Using the isotropic character of this channel we prove analytically that the mutual information cannot be increased by encoding classical bits into entangled states of two qubits.","authors_text":"C. Macchiavello, D. Bruss, L. Faoro, M. Palma","cross_cats":[],"headline":"","license":"","primary_cat":"quant-ph","submitted_at":"1999-03-09T15:56:36Z","title":"Quantum entanglement and classical communication through a depolarising channel"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"quant-ph/9903033","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:f2c0d224519c353b68677f3e45090eb7344ce251eb666ee590dafb9828093058","target":"record","created_at":"2026-05-18T01:37:52Z","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":"f16839831df419d297ec0d3793be6f9bc1152e075f3f1d21b36e6826b9bdd850","cross_cats_sorted":[],"license":"","primary_cat":"quant-ph","submitted_at":"1999-03-09T15:56:36Z","title_canon_sha256":"fd0acf971922b6238058fb7efb3814d8670136b0199c9f1152572b527d0eb399"},"schema_version":"1.0","source":{"id":"quant-ph/9903033","kind":"arxiv","version":2}},"canonical_sha256":"4e14b9d9522386014a348215b37faa2431955869b94a6907e223919b90cdbd6b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4e14b9d9522386014a348215b37faa2431955869b94a6907e223919b90cdbd6b","first_computed_at":"2026-05-18T01:37:52.619284Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:37:52.619284Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"FFRXRedIloUjVd5vx7I76hH+EHCAFgxe14uysQzz+GbdmcojlAHXmOz/iLoFeLYQwl5cj1o2WLczwVwogxINCw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:37:52.619996Z","signed_message":"canonical_sha256_bytes"},"source_id":"quant-ph/9903033","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f2c0d224519c353b68677f3e45090eb7344ce251eb666ee590dafb9828093058","sha256:25d2a4c4689d56529626572814db9eca904555227bd56a75916676028fa4861b"],"state_sha256":"f858728ee6eb2b2f9b944f9f686951fc3adae04b21c1fd2df2c06d421a2cb012"}