{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2008:NLYR5AV6HM7GZMI2XR7UM3ZM2B","short_pith_number":"pith:NLYR5AV6","canonical_record":{"source":{"id":"0805.4092","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2008-05-27T10:24:37Z","cross_cats_sorted":[],"title_canon_sha256":"b02384d18629b89c0d80e302770fc5faed9bcd0193696c75a7e5b42136fa4700","abstract_canon_sha256":"bd42e2435ca81e18f8357c267aef61927c228558cf2436e96c30055b0220c5ff"},"schema_version":"1.0"},"canonical_sha256":"6af11e82be3b3e6cb11abc7f466f2cd0765e032dd69c4dded5a50d67903f6ef9","source":{"kind":"arxiv","id":"0805.4092","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0805.4092","created_at":"2026-05-18T04:19:32Z"},{"alias_kind":"arxiv_version","alias_value":"0805.4092v2","created_at":"2026-05-18T04:19:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0805.4092","created_at":"2026-05-18T04:19:32Z"},{"alias_kind":"pith_short_12","alias_value":"NLYR5AV6HM7G","created_at":"2026-05-18T12:25:57Z"},{"alias_kind":"pith_short_16","alias_value":"NLYR5AV6HM7GZMI2","created_at":"2026-05-18T12:25:57Z"},{"alias_kind":"pith_short_8","alias_value":"NLYR5AV6","created_at":"2026-05-18T12:25:57Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2008:NLYR5AV6HM7GZMI2XR7UM3ZM2B","target":"record","payload":{"canonical_record":{"source":{"id":"0805.4092","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2008-05-27T10:24:37Z","cross_cats_sorted":[],"title_canon_sha256":"b02384d18629b89c0d80e302770fc5faed9bcd0193696c75a7e5b42136fa4700","abstract_canon_sha256":"bd42e2435ca81e18f8357c267aef61927c228558cf2436e96c30055b0220c5ff"},"schema_version":"1.0"},"canonical_sha256":"6af11e82be3b3e6cb11abc7f466f2cd0765e032dd69c4dded5a50d67903f6ef9","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:19:32.735707Z","signature_b64":"TXDNaynVJo5hBo9LwF1lKdymdZgGHR26QBHkJyIlFrpjCcpY4utXG+VdSfrDD5lmMjVt2ODbdpd7DcrCoGafAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6af11e82be3b3e6cb11abc7f466f2cd0765e032dd69c4dded5a50d67903f6ef9","last_reissued_at":"2026-05-18T04:19:32.735265Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:19:32.735265Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0805.4092","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":"2026-05-18T04:19:32Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bhkV0Z2T5n+sOazCqQCNYsRmE26Qc6GxzRlXkx60j9LwGM00Ebtgm06HeNd6z0mJqWCZHwv9EmGYrIUkDUJIAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T14:41:15.953993Z"},"content_sha256":"a769198a7540c5b3fc51f0a37e7e9c71deb3a061518420050622847d9fa61752","schema_version":"1.0","event_id":"sha256:a769198a7540c5b3fc51f0a37e7e9c71deb3a061518420050622847d9fa61752"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2008:NLYR5AV6HM7GZMI2XR7UM3ZM2B","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Universal coding for classical-quantum channel","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Masahito Hayashi","submitted_at":"2008-05-27T10:24:37Z","abstract_excerpt":"We construct a universal code for stationary and memoryless classical-quantum channel as a quantum version of the universal coding by Csisz\\'{a}r and K\\\"{o}rner. Our code is constructed by the combination of irreducible representation, the decoder introduced through quantum information spectrum, and the packing lemma."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0805.4092","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":"2026-05-18T04:19:32Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jphaVnlcRuoP7DSl+q9ljrSqNaugcb4qGDmoC2dRbA+ghdoie9W1WlxjCmeKVfss8AK1ZrmW6hDkhGpCT7vhCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T14:41:15.954338Z"},"content_sha256":"f08ef57b542eb9a3fbcdce465f1a4046e9cf21d1aa66aee4500d2ed276864b11","schema_version":"1.0","event_id":"sha256:f08ef57b542eb9a3fbcdce465f1a4046e9cf21d1aa66aee4500d2ed276864b11"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/NLYR5AV6HM7GZMI2XR7UM3ZM2B/bundle.json","state_url":"https://pith.science/pith/NLYR5AV6HM7GZMI2XR7UM3ZM2B/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/NLYR5AV6HM7GZMI2XR7UM3ZM2B/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":"2026-06-02T14:41:15Z","links":{"resolver":"https://pith.science/pith/NLYR5AV6HM7GZMI2XR7UM3ZM2B","bundle":"https://pith.science/pith/NLYR5AV6HM7GZMI2XR7UM3ZM2B/bundle.json","state":"https://pith.science/pith/NLYR5AV6HM7GZMI2XR7UM3ZM2B/state.json","well_known_bundle":"https://pith.science/.well-known/pith/NLYR5AV6HM7GZMI2XR7UM3ZM2B/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2008:NLYR5AV6HM7GZMI2XR7UM3ZM2B","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":"bd42e2435ca81e18f8357c267aef61927c228558cf2436e96c30055b0220c5ff","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2008-05-27T10:24:37Z","title_canon_sha256":"b02384d18629b89c0d80e302770fc5faed9bcd0193696c75a7e5b42136fa4700"},"schema_version":"1.0","source":{"id":"0805.4092","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0805.4092","created_at":"2026-05-18T04:19:32Z"},{"alias_kind":"arxiv_version","alias_value":"0805.4092v2","created_at":"2026-05-18T04:19:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0805.4092","created_at":"2026-05-18T04:19:32Z"},{"alias_kind":"pith_short_12","alias_value":"NLYR5AV6HM7G","created_at":"2026-05-18T12:25:57Z"},{"alias_kind":"pith_short_16","alias_value":"NLYR5AV6HM7GZMI2","created_at":"2026-05-18T12:25:57Z"},{"alias_kind":"pith_short_8","alias_value":"NLYR5AV6","created_at":"2026-05-18T12:25:57Z"}],"graph_snapshots":[{"event_id":"sha256:f08ef57b542eb9a3fbcdce465f1a4046e9cf21d1aa66aee4500d2ed276864b11","target":"graph","created_at":"2026-05-18T04:19:32Z","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 construct a universal code for stationary and memoryless classical-quantum channel as a quantum version of the universal coding by Csisz\\'{a}r and K\\\"{o}rner. Our code is constructed by the combination of irreducible representation, the decoder introduced through quantum information spectrum, and the packing lemma.","authors_text":"Masahito Hayashi","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2008-05-27T10:24:37Z","title":"Universal coding for classical-quantum channel"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0805.4092","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:a769198a7540c5b3fc51f0a37e7e9c71deb3a061518420050622847d9fa61752","target":"record","created_at":"2026-05-18T04:19:32Z","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":"bd42e2435ca81e18f8357c267aef61927c228558cf2436e96c30055b0220c5ff","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2008-05-27T10:24:37Z","title_canon_sha256":"b02384d18629b89c0d80e302770fc5faed9bcd0193696c75a7e5b42136fa4700"},"schema_version":"1.0","source":{"id":"0805.4092","kind":"arxiv","version":2}},"canonical_sha256":"6af11e82be3b3e6cb11abc7f466f2cd0765e032dd69c4dded5a50d67903f6ef9","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6af11e82be3b3e6cb11abc7f466f2cd0765e032dd69c4dded5a50d67903f6ef9","first_computed_at":"2026-05-18T04:19:32.735265Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:19:32.735265Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"TXDNaynVJo5hBo9LwF1lKdymdZgGHR26QBHkJyIlFrpjCcpY4utXG+VdSfrDD5lmMjVt2ODbdpd7DcrCoGafAg==","signature_status":"signed_v1","signed_at":"2026-05-18T04:19:32.735707Z","signed_message":"canonical_sha256_bytes"},"source_id":"0805.4092","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a769198a7540c5b3fc51f0a37e7e9c71deb3a061518420050622847d9fa61752","sha256:f08ef57b542eb9a3fbcdce465f1a4046e9cf21d1aa66aee4500d2ed276864b11"],"state_sha256":"f9d80e2933ab372393e4105d2b1f1034f687d53d8f5db188a0e48353f0eb01f7"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ixaAVuCq6onl7HHixbj28KggxSkXPgYE0F7dErbYPkmnWMBWUGeR1SOkaYaBywqYcd/6LYDgWg0dIbu/q6p/Cw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T14:41:15.956213Z","bundle_sha256":"f2aa748f3827ee54c13778a4d69c7520f9d77dd90fa51737f1a510f17edb6e9e"}}