{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:ZFPBGXBWCMTJINMZPTMKLV4TII","short_pith_number":"pith:ZFPBGXBW","canonical_record":{"source":{"id":"2607.21663","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2026-07-23T00:46:29Z","cross_cats_sorted":[],"title_canon_sha256":"20a724f80d51a835ddabe9d27f52c26033c5d9973863f3c3e87b1d0ab2fd87b4","abstract_canon_sha256":"2cf0809a0661f131c0d87e21357cdb89c4f30b989e5db6180322bf0a58a121f5"},"schema_version":"1.0"},"canonical_sha256":"c95e135c3613269435997cd8a5d793423e2ab32186f7855a81453d3ce713c7ce","source":{"kind":"arxiv","id":"2607.21663","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2607.21663","created_at":"2026-07-27T00:20:13Z"},{"alias_kind":"arxiv_version","alias_value":"2607.21663v1","created_at":"2026-07-27T00:20:13Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2607.21663","created_at":"2026-07-27T00:20:13Z"},{"alias_kind":"pith_short_12","alias_value":"ZFPBGXBWCMTJ","created_at":"2026-07-27T00:20:13Z"},{"alias_kind":"pith_short_16","alias_value":"ZFPBGXBWCMTJINMZ","created_at":"2026-07-27T00:20:13Z"},{"alias_kind":"pith_short_8","alias_value":"ZFPBGXBW","created_at":"2026-07-27T00:20:13Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:ZFPBGXBWCMTJINMZPTMKLV4TII","target":"record","payload":{"canonical_record":{"source":{"id":"2607.21663","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2026-07-23T00:46:29Z","cross_cats_sorted":[],"title_canon_sha256":"20a724f80d51a835ddabe9d27f52c26033c5d9973863f3c3e87b1d0ab2fd87b4","abstract_canon_sha256":"2cf0809a0661f131c0d87e21357cdb89c4f30b989e5db6180322bf0a58a121f5"},"schema_version":"1.0"},"canonical_sha256":"c95e135c3613269435997cd8a5d793423e2ab32186f7855a81453d3ce713c7ce","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-27T00:20:13.928543Z","signature_b64":"mKoqXmRx1RT58Lw80PvwRBJcG6/8hsgjsrnaQbpIKAbyx7aZPzHRXvv4OnA3bnMIjrACuIls/H39IugwM5SrCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c95e135c3613269435997cd8a5d793423e2ab32186f7855a81453d3ce713c7ce","last_reissued_at":"2026-07-27T00:20:13.927367Z","signature_status":"signed_v1","first_computed_at":"2026-07-27T00:20:13.927367Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2607.21663","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":"2026-07-27T00:20:13Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5Lbgz5qGIqDjrnRT/f1l5kqNZmq+YEyvKIAZnYGP9h3j4jHX8Pglj0Pmp5i0iWKYI9aDN0h2e6sFw9tAaZH4CA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T22:58:50.867316Z"},"content_sha256":"446e1683537eaac2803602a7b64319a7c5bdb942bae35b1eab5674b68912f969","schema_version":"1.0","event_id":"sha256:446e1683537eaac2803602a7b64319a7c5bdb942bae35b1eab5674b68912f969"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:ZFPBGXBWCMTJINMZPTMKLV4TII","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Absent, Not Faint: Fisher-Information Limits and a Logarithmic Measurement-Design Cure for Passive Characterization of Coherent Qubit Noise","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Hanqi Jiang, Isaac Lyngaas, Junhao Chen, Meng Hsiu Tsai, Tianming Liu, Weihang You, Wei Zhang, Yingfeng Wang, Yi Pan","submitted_at":"2026-07-23T00:46:29Z","abstract_excerpt":"Calibrating a quantum processor means estimating error parameters, and estimation theory usually assumes a parameter hard to estimate is faint: its signal is weak but present, so more repetitions or a richer model will recover it. This assumption fails for a leading hardware fault. A coherent over-rotation is a small systematic gate miscalibration. Measured through the cheapest data a device returns--one fixed-basis histogram--it is not faint but absent: to first order it leaves the distribution unchanged, indistinguishable from a compensating stochastic error, exactly as two numbers cannot be"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.21663","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/2607.21663/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":"2026-07-27T00:20:13Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"KYTCQcRdqbLoy2wu1U4si2Odx//w042aQWIntLgwJ/bCBFlGSqUf4FZdJ4/tHIVG4rhDxc2LYGunKWUT5apACQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T22:58:50.867695Z"},"content_sha256":"65b944e469e8b88aac4a83f4563c32b6429c51e56373a11c29ff3c10d3f4d8b2","schema_version":"1.0","event_id":"sha256:65b944e469e8b88aac4a83f4563c32b6429c51e56373a11c29ff3c10d3f4d8b2"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ZFPBGXBWCMTJINMZPTMKLV4TII/bundle.json","state_url":"https://pith.science/pith/ZFPBGXBWCMTJINMZPTMKLV4TII/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ZFPBGXBWCMTJINMZPTMKLV4TII/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":"2026-08-03T22:58:50Z","links":{"resolver":"https://pith.science/pith/ZFPBGXBWCMTJINMZPTMKLV4TII","bundle":"https://pith.science/pith/ZFPBGXBWCMTJINMZPTMKLV4TII/bundle.json","state":"https://pith.science/pith/ZFPBGXBWCMTJINMZPTMKLV4TII/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ZFPBGXBWCMTJINMZPTMKLV4TII/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:ZFPBGXBWCMTJINMZPTMKLV4TII","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":"2cf0809a0661f131c0d87e21357cdb89c4f30b989e5db6180322bf0a58a121f5","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2026-07-23T00:46:29Z","title_canon_sha256":"20a724f80d51a835ddabe9d27f52c26033c5d9973863f3c3e87b1d0ab2fd87b4"},"schema_version":"1.0","source":{"id":"2607.21663","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2607.21663","created_at":"2026-07-27T00:20:13Z"},{"alias_kind":"arxiv_version","alias_value":"2607.21663v1","created_at":"2026-07-27T00:20:13Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2607.21663","created_at":"2026-07-27T00:20:13Z"},{"alias_kind":"pith_short_12","alias_value":"ZFPBGXBWCMTJ","created_at":"2026-07-27T00:20:13Z"},{"alias_kind":"pith_short_16","alias_value":"ZFPBGXBWCMTJINMZ","created_at":"2026-07-27T00:20:13Z"},{"alias_kind":"pith_short_8","alias_value":"ZFPBGXBW","created_at":"2026-07-27T00:20:13Z"}],"graph_snapshots":[{"event_id":"sha256:65b944e469e8b88aac4a83f4563c32b6429c51e56373a11c29ff3c10d3f4d8b2","target":"graph","created_at":"2026-07-27T00:20:13Z","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/2607.21663/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Calibrating a quantum processor means estimating error parameters, and estimation theory usually assumes a parameter hard to estimate is faint: its signal is weak but present, so more repetitions or a richer model will recover it. This assumption fails for a leading hardware fault. A coherent over-rotation is a small systematic gate miscalibration. Measured through the cheapest data a device returns--one fixed-basis histogram--it is not faint but absent: to first order it leaves the distribution unchanged, indistinguishable from a compensating stochastic error, exactly as two numbers cannot be","authors_text":"Hanqi Jiang, Isaac Lyngaas, Junhao Chen, Meng Hsiu Tsai, Tianming Liu, Weihang You, Wei Zhang, Yingfeng Wang, Yi Pan","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2026-07-23T00:46:29Z","title":"Absent, Not Faint: Fisher-Information Limits and a Logarithmic Measurement-Design Cure for Passive Characterization of Coherent Qubit Noise"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.21663","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":"sha256:446e1683537eaac2803602a7b64319a7c5bdb942bae35b1eab5674b68912f969","target":"record","created_at":"2026-07-27T00:20:13Z","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":"2cf0809a0661f131c0d87e21357cdb89c4f30b989e5db6180322bf0a58a121f5","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2026-07-23T00:46:29Z","title_canon_sha256":"20a724f80d51a835ddabe9d27f52c26033c5d9973863f3c3e87b1d0ab2fd87b4"},"schema_version":"1.0","source":{"id":"2607.21663","kind":"arxiv","version":1}},"canonical_sha256":"c95e135c3613269435997cd8a5d793423e2ab32186f7855a81453d3ce713c7ce","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c95e135c3613269435997cd8a5d793423e2ab32186f7855a81453d3ce713c7ce","first_computed_at":"2026-07-27T00:20:13.927367Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-27T00:20:13.927367Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"mKoqXmRx1RT58Lw80PvwRBJcG6/8hsgjsrnaQbpIKAbyx7aZPzHRXvv4OnA3bnMIjrACuIls/H39IugwM5SrCQ==","signature_status":"signed_v1","signed_at":"2026-07-27T00:20:13.928543Z","signed_message":"canonical_sha256_bytes"},"source_id":"2607.21663","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:446e1683537eaac2803602a7b64319a7c5bdb942bae35b1eab5674b68912f969","sha256:65b944e469e8b88aac4a83f4563c32b6429c51e56373a11c29ff3c10d3f4d8b2"],"state_sha256":"c53fc77c062e8f1ae4f4d5a478437ce3381c1cfa10d4a190df9486554a3f9496"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0esjDkmZ8POqMyb9H07YYa+L9Uc1aCNs2gyf38P/30iZGwKiyi36YylEby97pT5d32ZQrDjgwllLlXEkJQBmCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-03T22:58:50.870337Z","bundle_sha256":"d8f7f6647faa2adda681324e14c83ce17cb88ee71716776cc53fb37f05a25a76"}}