{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:2ZWVHCK3BLORRCYDU2SONENXO4","short_pith_number":"pith:2ZWVHCK3","canonical_record":{"source":{"id":"1305.7490","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2013-05-31T17:23:29Z","cross_cats_sorted":[],"title_canon_sha256":"3199ff95a975395b186bbf6532367abc7a1881a410e2ae47d8ebb6a9a493025a","abstract_canon_sha256":"080c6af73e013c83b9e19cb5fb203dbec6a6f097fd8c28bba3cfb5eb0bf4c3ab"},"schema_version":"1.0"},"canonical_sha256":"d66d53895b0add188b03a6a4e691b7772bf8cddffb868a412308418e5d43dd9b","source":{"kind":"arxiv","id":"1305.7490","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1305.7490","created_at":"2026-05-18T03:19:56Z"},{"alias_kind":"arxiv_version","alias_value":"1305.7490v1","created_at":"2026-05-18T03:19:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1305.7490","created_at":"2026-05-18T03:19:56Z"},{"alias_kind":"pith_short_12","alias_value":"2ZWVHCK3BLOR","created_at":"2026-05-18T12:27:32Z"},{"alias_kind":"pith_short_16","alias_value":"2ZWVHCK3BLORRCYD","created_at":"2026-05-18T12:27:32Z"},{"alias_kind":"pith_short_8","alias_value":"2ZWVHCK3","created_at":"2026-05-18T12:27:32Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:2ZWVHCK3BLORRCYDU2SONENXO4","target":"record","payload":{"canonical_record":{"source":{"id":"1305.7490","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2013-05-31T17:23:29Z","cross_cats_sorted":[],"title_canon_sha256":"3199ff95a975395b186bbf6532367abc7a1881a410e2ae47d8ebb6a9a493025a","abstract_canon_sha256":"080c6af73e013c83b9e19cb5fb203dbec6a6f097fd8c28bba3cfb5eb0bf4c3ab"},"schema_version":"1.0"},"canonical_sha256":"d66d53895b0add188b03a6a4e691b7772bf8cddffb868a412308418e5d43dd9b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:19:56.222704Z","signature_b64":"cLmbCFl3qIUJgLUVmeT91F6A4tWTh+V/fRsKAqp13ojY80vJsRlhEXO4FqJfkLvxoMqhqrsfDw+Y8mjIFb89Bg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d66d53895b0add188b03a6a4e691b7772bf8cddffb868a412308418e5d43dd9b","last_reissued_at":"2026-05-18T03:19:56.222041Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:19:56.222041Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1305.7490","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":"2026-05-18T03:19:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WzaGKeM/kjAGYMoaIzHQ55aykpgL6RkERNXMnRZGgPWtok3qwBeWKAMMvY6h0KcSNTcqoJsoguCz+Nv8qgGfAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T13:33:47.559955Z"},"content_sha256":"2a58d2e08fda918a7a35ad49c0495a648ddce3d3884d677755e8456d54809254","schema_version":"1.0","event_id":"sha256:2a58d2e08fda918a7a35ad49c0495a648ddce3d3884d677755e8456d54809254"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:2ZWVHCK3BLORRCYDU2SONENXO4","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A review on super dense coding over covariant noisy channels","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Chiara Macchiavello, Dagmar Bruss, Hermann Kampermann, Zahra Shadman","submitted_at":"2013-05-31T17:23:29Z","abstract_excerpt":"We study the performance of the super dense coding protocol in the presence of quantum channels with covariant noise. We first consider the bipartite case and review in a unified way the case of general Pauli channels. We discuss both the cases of unitary and non-unitary encoding. We also study the multipartite scenario and investigate the case of many senders and one receiver."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1305.7490","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":"2026-05-18T03:19:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fr1xcrzUoPRw3RbjuPy+PawW5QCkPatFYyHwG/e5Px+jZTTzdB6XjGN+/+6K8S49bvR9MWaC/OxDmxmAlWTKAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T13:33:47.560291Z"},"content_sha256":"44b925b6eb766012be8ef1e327580f890ce1ea04a4373248375d3cc60b09eab9","schema_version":"1.0","event_id":"sha256:44b925b6eb766012be8ef1e327580f890ce1ea04a4373248375d3cc60b09eab9"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/2ZWVHCK3BLORRCYDU2SONENXO4/bundle.json","state_url":"https://pith.science/pith/2ZWVHCK3BLORRCYDU2SONENXO4/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/2ZWVHCK3BLORRCYDU2SONENXO4/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":"2026-05-28T13:33:47Z","links":{"resolver":"https://pith.science/pith/2ZWVHCK3BLORRCYDU2SONENXO4","bundle":"https://pith.science/pith/2ZWVHCK3BLORRCYDU2SONENXO4/bundle.json","state":"https://pith.science/pith/2ZWVHCK3BLORRCYDU2SONENXO4/state.json","well_known_bundle":"https://pith.science/.well-known/pith/2ZWVHCK3BLORRCYDU2SONENXO4/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:2ZWVHCK3BLORRCYDU2SONENXO4","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":"080c6af73e013c83b9e19cb5fb203dbec6a6f097fd8c28bba3cfb5eb0bf4c3ab","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2013-05-31T17:23:29Z","title_canon_sha256":"3199ff95a975395b186bbf6532367abc7a1881a410e2ae47d8ebb6a9a493025a"},"schema_version":"1.0","source":{"id":"1305.7490","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1305.7490","created_at":"2026-05-18T03:19:56Z"},{"alias_kind":"arxiv_version","alias_value":"1305.7490v1","created_at":"2026-05-18T03:19:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1305.7490","created_at":"2026-05-18T03:19:56Z"},{"alias_kind":"pith_short_12","alias_value":"2ZWVHCK3BLOR","created_at":"2026-05-18T12:27:32Z"},{"alias_kind":"pith_short_16","alias_value":"2ZWVHCK3BLORRCYD","created_at":"2026-05-18T12:27:32Z"},{"alias_kind":"pith_short_8","alias_value":"2ZWVHCK3","created_at":"2026-05-18T12:27:32Z"}],"graph_snapshots":[{"event_id":"sha256:44b925b6eb766012be8ef1e327580f890ce1ea04a4373248375d3cc60b09eab9","target":"graph","created_at":"2026-05-18T03:19:56Z","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 study the performance of the super dense coding protocol in the presence of quantum channels with covariant noise. We first consider the bipartite case and review in a unified way the case of general Pauli channels. We discuss both the cases of unitary and non-unitary encoding. We also study the multipartite scenario and investigate the case of many senders and one receiver.","authors_text":"Chiara Macchiavello, Dagmar Bruss, Hermann Kampermann, Zahra Shadman","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2013-05-31T17:23:29Z","title":"A review on super dense coding over covariant noisy channels"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1305.7490","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":"sha256:2a58d2e08fda918a7a35ad49c0495a648ddce3d3884d677755e8456d54809254","target":"record","created_at":"2026-05-18T03:19:56Z","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":"080c6af73e013c83b9e19cb5fb203dbec6a6f097fd8c28bba3cfb5eb0bf4c3ab","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2013-05-31T17:23:29Z","title_canon_sha256":"3199ff95a975395b186bbf6532367abc7a1881a410e2ae47d8ebb6a9a493025a"},"schema_version":"1.0","source":{"id":"1305.7490","kind":"arxiv","version":1}},"canonical_sha256":"d66d53895b0add188b03a6a4e691b7772bf8cddffb868a412308418e5d43dd9b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d66d53895b0add188b03a6a4e691b7772bf8cddffb868a412308418e5d43dd9b","first_computed_at":"2026-05-18T03:19:56.222041Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:19:56.222041Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"cLmbCFl3qIUJgLUVmeT91F6A4tWTh+V/fRsKAqp13ojY80vJsRlhEXO4FqJfkLvxoMqhqrsfDw+Y8mjIFb89Bg==","signature_status":"signed_v1","signed_at":"2026-05-18T03:19:56.222704Z","signed_message":"canonical_sha256_bytes"},"source_id":"1305.7490","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2a58d2e08fda918a7a35ad49c0495a648ddce3d3884d677755e8456d54809254","sha256:44b925b6eb766012be8ef1e327580f890ce1ea04a4373248375d3cc60b09eab9"],"state_sha256":"6223d6bbc56dc5e8508d7960278e008225ec8c6280a4febdc8d2122a54bc054a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"16u6wlu4nsVgIKWlj5qPw2v0MzFO3MzVguWbWYYuRNg7mxCgMMxZXfWSsrm3k9tMw9AN/F0AN9b9Wh9blH/NDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T13:33:47.562289Z","bundle_sha256":"cce2b24f575d4117771bb65075f6e650ae3fb0f0daf656f14b14007b45370e2b"}}