{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:R3K2AW3OEGZOFU6AHKHZW7V43E","short_pith_number":"pith:R3K2AW3O","canonical_record":{"source":{"id":"2104.04607","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2021-04-09T21:19:46Z","cross_cats_sorted":[],"title_canon_sha256":"ec42da1c688365669014c9aeb3674e7d45b3acba4a99a5998846b3eef2e2f3e3","abstract_canon_sha256":"595101620be01272376a7d2b739686fc5321ffa9773b22b491dd448698f600da"},"schema_version":"1.0"},"canonical_sha256":"8ed5a05b6e21b2e2d3c03a8f9b7ebcd9061d0ee6f3f53b5165f40e89de0c576e","source":{"kind":"arxiv","id":"2104.04607","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2104.04607","created_at":"2026-07-05T02:30:45Z"},{"alias_kind":"arxiv_version","alias_value":"2104.04607v1","created_at":"2026-07-05T02:30:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2104.04607","created_at":"2026-07-05T02:30:45Z"},{"alias_kind":"pith_short_12","alias_value":"R3K2AW3OEGZO","created_at":"2026-07-05T02:30:45Z"},{"alias_kind":"pith_short_16","alias_value":"R3K2AW3OEGZOFU6A","created_at":"2026-07-05T02:30:45Z"},{"alias_kind":"pith_short_8","alias_value":"R3K2AW3O","created_at":"2026-07-05T02:30:45Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:R3K2AW3OEGZOFU6AHKHZW7V43E","target":"record","payload":{"canonical_record":{"source":{"id":"2104.04607","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2021-04-09T21:19:46Z","cross_cats_sorted":[],"title_canon_sha256":"ec42da1c688365669014c9aeb3674e7d45b3acba4a99a5998846b3eef2e2f3e3","abstract_canon_sha256":"595101620be01272376a7d2b739686fc5321ffa9773b22b491dd448698f600da"},"schema_version":"1.0"},"canonical_sha256":"8ed5a05b6e21b2e2d3c03a8f9b7ebcd9061d0ee6f3f53b5165f40e89de0c576e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:30:45.379916Z","signature_b64":"v/5MP5ItEYTypDDEOoxRv6tfEMOpvjYegbF2hME0n4x2D02Ak/A5KEPAx4+42MPuAwmbzYfsTypEoHrkZbPcBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8ed5a05b6e21b2e2d3c03a8f9b7ebcd9061d0ee6f3f53b5165f40e89de0c576e","last_reissued_at":"2026-07-05T02:30:45.379498Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:30:45.379498Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2104.04607","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":"2026-07-05T02:30:45Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"LUEzpyLT3zHv7drc4kU27Rp/DD2u7w2td3QXIEwWF/6EL4neMJxCuOicuLtiq5aE86XYtwfeewzZERf5+ruFAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-06T06:23:12.262663Z"},"content_sha256":"fb73d5366a95877ef884d2daa4483fd433e4ccc447a93874c3f8ea0869ab6dba","schema_version":"1.0","event_id":"sha256:fb73d5366a95877ef884d2daa4483fd433e4ccc447a93874c3f8ea0869ab6dba"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:R3K2AW3OEGZOFU6AHKHZW7V43E","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Categorizing Readout Error Correlations on Near Term Quantum Computers","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Benjamin Nachman, Michael R. Geller","submitted_at":"2021-04-09T21:19:46Z","abstract_excerpt":"Readout errors are a significant source of noise for near term quantum computers. A variety of methods have been proposed to mitigate these errors using classical post processing. For a system with $n$ qubits, the entire readout error profile is specified by a $2^n\\times 2^n$ matrix. Recent proposals to use sub-exponential approximations rely on small and/or short-ranged error correlations. In this paper, we introduce and demonstrate a methodology to categorize and quantify multiqubit readout error correlations. Two distinct types of error correlations are considered: sensitivity of the measur"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2104.04607","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2104.04607/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T02:30:45Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"OA1ACeAljspEhLoj0UzM9bjjA4kFoS0hIDiB8Mm6Zp1SSWuDeMov0J1LCqpDujdLwEN826GBE0XM9O5qqz56Ag==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-06T06:23:12.263345Z"},"content_sha256":"97f64d745a6bec25e2611cbac09f4792b8942c0550bbb5fa8828c91c025a1794","schema_version":"1.0","event_id":"sha256:97f64d745a6bec25e2611cbac09f4792b8942c0550bbb5fa8828c91c025a1794"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/R3K2AW3OEGZOFU6AHKHZW7V43E/bundle.json","state_url":"https://pith.science/pith/R3K2AW3OEGZOFU6AHKHZW7V43E/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/R3K2AW3OEGZOFU6AHKHZW7V43E/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":"2026-08-06T06:23:12Z","links":{"resolver":"https://pith.science/pith/R3K2AW3OEGZOFU6AHKHZW7V43E","bundle":"https://pith.science/pith/R3K2AW3OEGZOFU6AHKHZW7V43E/bundle.json","state":"https://pith.science/pith/R3K2AW3OEGZOFU6AHKHZW7V43E/state.json","well_known_bundle":"https://pith.science/.well-known/pith/R3K2AW3OEGZOFU6AHKHZW7V43E/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:R3K2AW3OEGZOFU6AHKHZW7V43E","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":"595101620be01272376a7d2b739686fc5321ffa9773b22b491dd448698f600da","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2021-04-09T21:19:46Z","title_canon_sha256":"ec42da1c688365669014c9aeb3674e7d45b3acba4a99a5998846b3eef2e2f3e3"},"schema_version":"1.0","source":{"id":"2104.04607","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2104.04607","created_at":"2026-07-05T02:30:45Z"},{"alias_kind":"arxiv_version","alias_value":"2104.04607v1","created_at":"2026-07-05T02:30:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2104.04607","created_at":"2026-07-05T02:30:45Z"},{"alias_kind":"pith_short_12","alias_value":"R3K2AW3OEGZO","created_at":"2026-07-05T02:30:45Z"},{"alias_kind":"pith_short_16","alias_value":"R3K2AW3OEGZOFU6A","created_at":"2026-07-05T02:30:45Z"},{"alias_kind":"pith_short_8","alias_value":"R3K2AW3O","created_at":"2026-07-05T02:30:45Z"}],"graph_snapshots":[{"event_id":"sha256:97f64d745a6bec25e2611cbac09f4792b8942c0550bbb5fa8828c91c025a1794","target":"graph","created_at":"2026-07-05T02:30:45Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2104.04607/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Readout errors are a significant source of noise for near term quantum computers. A variety of methods have been proposed to mitigate these errors using classical post processing. For a system with $n$ qubits, the entire readout error profile is specified by a $2^n\\times 2^n$ matrix. Recent proposals to use sub-exponential approximations rely on small and/or short-ranged error correlations. In this paper, we introduce and demonstrate a methodology to categorize and quantify multiqubit readout error correlations. Two distinct types of error correlations are considered: sensitivity of the measur","authors_text":"Benjamin Nachman, Michael R. Geller","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2021-04-09T21:19:46Z","title":"Categorizing Readout Error Correlations on Near Term Quantum Computers"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2104.04607","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:fb73d5366a95877ef884d2daa4483fd433e4ccc447a93874c3f8ea0869ab6dba","target":"record","created_at":"2026-07-05T02:30:45Z","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":"595101620be01272376a7d2b739686fc5321ffa9773b22b491dd448698f600da","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2021-04-09T21:19:46Z","title_canon_sha256":"ec42da1c688365669014c9aeb3674e7d45b3acba4a99a5998846b3eef2e2f3e3"},"schema_version":"1.0","source":{"id":"2104.04607","kind":"arxiv","version":1}},"canonical_sha256":"8ed5a05b6e21b2e2d3c03a8f9b7ebcd9061d0ee6f3f53b5165f40e89de0c576e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8ed5a05b6e21b2e2d3c03a8f9b7ebcd9061d0ee6f3f53b5165f40e89de0c576e","first_computed_at":"2026-07-05T02:30:45.379498Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:30:45.379498Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"v/5MP5ItEYTypDDEOoxRv6tfEMOpvjYegbF2hME0n4x2D02Ak/A5KEPAx4+42MPuAwmbzYfsTypEoHrkZbPcBw==","signature_status":"signed_v1","signed_at":"2026-07-05T02:30:45.379916Z","signed_message":"canonical_sha256_bytes"},"source_id":"2104.04607","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:fb73d5366a95877ef884d2daa4483fd433e4ccc447a93874c3f8ea0869ab6dba","sha256:97f64d745a6bec25e2611cbac09f4792b8942c0550bbb5fa8828c91c025a1794"],"state_sha256":"3c4b0e7f350016234b690e64e162d3fa24098ac1a3bef246b8d032764adb7a12"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zufXqF3kfOsy3zxXT1d63jQi3mgsPRjWghQX8c0tbueIveJuv5QDP2RJti+QYYmWKlH+ebMy48Zp09P2AsylBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-06T06:23:12.269249Z","bundle_sha256":"41d9db3ac852e8573b220cef1d708bb7c1afe97e9553c9868c9ab6d1198b2948"}}