{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:5LH3WTE4EOEKQ66MQFCE4JQ2H3","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":"146caf1feb1cd5f9aa586210fa625c3e2b2ed6da3f9d0c0efd5b26116a9995e2","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2012-04-13T14:10:31Z","title_canon_sha256":"358f354777b1ab35145b10b36fae2550ec69eff428a143ec8dea8dcd949ae17d"},"schema_version":"1.0","source":{"id":"1204.3000","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1204.3000","created_at":"2026-05-18T03:57:38Z"},{"alias_kind":"arxiv_version","alias_value":"1204.3000v3","created_at":"2026-05-18T03:57:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1204.3000","created_at":"2026-05-18T03:57:38Z"},{"alias_kind":"pith_short_12","alias_value":"5LH3WTE4EOEK","created_at":"2026-05-18T12:26:56Z"},{"alias_kind":"pith_short_16","alias_value":"5LH3WTE4EOEKQ66M","created_at":"2026-05-18T12:26:56Z"},{"alias_kind":"pith_short_8","alias_value":"5LH3WTE4","created_at":"2026-05-18T12:26:56Z"}],"graph_snapshots":[{"event_id":"sha256:80b578169fedc5925b0b4996a96ebe6e9eb7da5b9dcb7a06da028dcd73385255","target":"graph","created_at":"2026-05-18T03:57:38Z","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 show how to use decoherence-free subspaces over collective-noise quantum channels to convey classical information in perfect secrecy. We argue that codes defined over decoherence-free subspaces are codes for quantum wiretap channels in which the gain of information by a non-authorized receiver is zero. We also show that if some symmetry conditions are guaranteed, the maximum rate on which these secret communications take place is equal to the Holevo-Schumacher-Westmoreland capacity of the quantum channel.","authors_text":"Ello\\'a B. Guedes, Francisco M. de Assis","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2012-04-13T14:10:31Z","title":"Unconditional Security with Decoherence-Free Subspaces"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1204.3000","kind":"arxiv","version":3},"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:fdbd7cd6233e3d5ce7d4ec97d6d7ae34c820a9ebc51a3b1df8c60ed4060615f3","target":"record","created_at":"2026-05-18T03:57:38Z","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":"146caf1feb1cd5f9aa586210fa625c3e2b2ed6da3f9d0c0efd5b26116a9995e2","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2012-04-13T14:10:31Z","title_canon_sha256":"358f354777b1ab35145b10b36fae2550ec69eff428a143ec8dea8dcd949ae17d"},"schema_version":"1.0","source":{"id":"1204.3000","kind":"arxiv","version":3}},"canonical_sha256":"eacfbb4c9c2388a87bcc81444e261a3ecfd4fae66dac3d48bf18f020db70c196","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"eacfbb4c9c2388a87bcc81444e261a3ecfd4fae66dac3d48bf18f020db70c196","first_computed_at":"2026-05-18T03:57:38.423625Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:57:38.423625Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"gg1nEYzzCd86HjVuJTcsOSlgx1AApax1tXfOs5JFtnNLUYRDfySN6Mcy0tZL4BNtD6l89RiLITIpEIYCO4pkAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T03:57:38.424232Z","signed_message":"canonical_sha256_bytes"},"source_id":"1204.3000","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:fdbd7cd6233e3d5ce7d4ec97d6d7ae34c820a9ebc51a3b1df8c60ed4060615f3","sha256:80b578169fedc5925b0b4996a96ebe6e9eb7da5b9dcb7a06da028dcd73385255"],"state_sha256":"5d496e7ca5d7f9b6decaa8510806c41778c9a22522cd24a9a27227a530783843"}