{"schemaVersion":"maha-epistemic/1.0","evidencePolicyVersion":"mps/0.1","recordId":"urn:maha:record:logical-error-suppression","canonicalPath":"/knowledge/quantum-systems/measurements/logical-error-suppression","contentHash":"sha256:52b879251adefe844287a7da085d242e0e1162f0f94db67bb25865e7e3b9759c","generatedAt":"2026-08-30T16:02:18.164Z","publicationDecision":{"recordId":"urn:maha:record:logical-error-suppression","publicEligible":true,"evaluatedAgainst":"maha-epistemic/1.0","reasons":[]},"claims":[{"id":"urn:maha:claim:logical-error-suppression","scope":"The models, apparatus, protocols, datasets, and comparisons reported in Suppressing quantum errors by scaling a surface code logical qubit.","boundary":"The comparison does not establish arbitrary-distance scaling, universal logical gates, or a complete fault-tolerant stack.","claimKind":"empirical-claim","sourceIds":["source-google-logical-error-2023"],"statement":"The cited experiment reports lower logical error per cycle for a larger surface-code memory than for a smaller one under the stated circuit, device, and decoder.","replication":{"asOfDate":"2026-08-24","assessment":"This candidate records one bounded source package. Independent replications and contradictory measurements must be compiled as separate records before maturity is upgraded.","independentReplicationCount":null},"uncertainty":{"kind":"qualitative","statement":"No platform-independent uncertainty interval exists; numerical values remain attached to the source experiment or model and its stated assumptions."},"evidenceMaturity":"single-study"}],"sources":[{"id":"source-google-logical-error-2023","url":"https://www.nature.com/articles/s41586-022-05434-1","title":"Suppressing quantum errors by scaling a surface code logical qubit","rights":{"note":"Maha paraphrases the source-level result and links to the version of record; no article passage is reproduced.","basis":"citation-with-paraphrase","quotationUsed":false},"authors":["Rajeev Acharya","Igor Aleiner","Richard Allen","Trond I. Andersen","et al."],"boundary":"The result does not establish a complete fault-tolerant computer, arbitrary-depth logical computation, or transferable logical error rates.","publisher":"Nature","establishes":"The experiment compares surface-code memories of different distances on a superconducting processor and reports the measured logical-error behavior under the stated circuits and decoder.","identifiers":[{"value":"10.1038/s41586-022-05434-1","scheme":"doi"}],"publishedAt":"2023-02-22","exactLocator":"Abstract; Figures 1–4; Methods; Extended Data.","conflictsOfInterest":"Most authors were affiliated with Google Quantum AI and the experiment used Google hardware."}],"reviewEvents":[{"scope":"source-fidelity","verdict":"approve","reviewId":"epireview_c2b8a93364a343a8b7c9a66c02ae7e74","rationale":"Logical-error suppression with code distance binds claim urn:maha:claim:logical-error-suppression only to Suppressing quantum errors by scaling a surface code logical qubit at Nature open-access version-of-record page, Abstract lines 38–42. The audit inspected version-of-record at declared inspected location depth and recorded subject and claim support; the claim remains limited to “The models, apparatus, protocols, datasets, and comparisons reported in Suppressing quantum errors by scaling a surface code logical qubit.”. This decision applies only to record urn:maha:record:logical-error-suppression at sha256:2ffe63c33bc6552238a34682a1f203b4b1f3c635fe69fef8261ec8424fa9830e and does not certify truth, external endorsement, independent reproduction, or fitness for use.","reviewedAt":"2026-08-30T16:01:52.374Z","reviewerId":"expert_maha-internal-editorial-scale-v1","reviewMethod":"Each criterion is recomputed from the exact record, its inspected alignment audit, source identity, exact locator, rights basis, claim scope, boundary, uncertainty, replication status, prohibited inferences, and revision digest.","reviewerKind":"internal-editorial","reviewerRole":"AI-assisted record-specific review of inspected source identity, exact locator, bounded claim, uncertainty, non-claims, rights basis, and exact revision. This is not an external subject-matter credential.","targetSha256":"sha256:2ffe63c33bc6552238a34682a1f203b4b1f3c635fe69fef8261ec8424fa9830e","supersedesReviewId":null,"reviewerProfileVersion":1},{"scope":"domain-fidelity","verdict":"approve","reviewId":"epireview_87c10a3b08da4b069551e5e302fca529","rationale":"Logical-error suppression with code distance remains within domain quantum-systems. Its mechanism or method is the bounded proposition “The cited experiment reports lower logical error per cycle for a larger surface-code memory than for a smaller one under the stated circuit, device, and decoder.”; the record does not transfer that proposition beyond The comparison does not establish arbitrary-distance scaling, universal logical gates, or a complete fault-tolerant stack. This decision applies only to record urn:maha:record:logical-error-suppression at sha256:2ffe63c33bc6552238a34682a1f203b4b1f3c635fe69fef8261ec8424fa9830e and does not certify truth, external endorsement, independent reproduction, or fitness for use.","reviewedAt":"2026-08-30T16:01:52.493Z","reviewerId":"expert_maha-internal-editorial-scale-v1","reviewMethod":"Each criterion is recomputed from the exact record, its inspected alignment audit, source identity, exact locator, rights basis, claim scope, boundary, uncertainty, replication status, prohibited inferences, and revision digest.","reviewerKind":"internal-editorial","reviewerRole":"AI-assisted record-specific review of inspected source identity, exact locator, bounded claim, uncertainty, non-claims, rights basis, and exact revision. 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This decision applies only to record urn:maha:record:logical-error-suppression at sha256:2ffe63c33bc6552238a34682a1f203b4b1f3c635fe69fef8261ec8424fa9830e and does not certify truth, external endorsement, independent reproduction, or fitness for use.","reviewedAt":"2026-08-30T16:01:52.596Z","reviewerId":"expert_maha-internal-editorial-scale-v1","reviewMethod":"Each criterion is recomputed from the exact record, its inspected alignment audit, source identity, exact locator, rights basis, claim scope, boundary, uncertainty, replication status, prohibited inferences, and revision digest.","reviewerKind":"internal-editorial","reviewerRole":"AI-assisted record-specific review of inspected source identity, exact locator, bounded claim, uncertainty, non-claims, rights basis, and exact revision. 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This decision applies only to record urn:maha:record:logical-error-suppression at sha256:2ffe63c33bc6552238a34682a1f203b4b1f3c635fe69fef8261ec8424fa9830e and does not certify truth, external endorsement, independent reproduction, or fitness for use.","reviewedAt":"2026-08-30T16:01:52.689Z","reviewerId":"expert_maha-internal-editorial-scale-v1","reviewMethod":"Each criterion is recomputed from the exact record, its inspected alignment audit, source identity, exact locator, rights basis, claim scope, boundary, uncertainty, replication status, prohibited inferences, and revision digest.","reviewerKind":"internal-editorial","reviewerRole":"AI-assisted record-specific review of inspected source identity, exact locator, bounded claim, uncertainty, non-claims, rights basis, and exact revision. This is not an external subject-matter credential.","targetSha256":"sha256:2ffe63c33bc6552238a34682a1f203b4b1f3c635fe69fef8261ec8424fa9830e","supersedesReviewId":null,"reviewerProfileVersion":1}]}