{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:XX3LXHWAG44AXN2KMLYXBBIKZA","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":"497a97aa084556ad14cb839d72d8f65d767442e202f91dd942795b0b262904e4","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2020-01-27T18:57:40Z","title_canon_sha256":"7a3da342aca17e42ff2af43072b9efb5f52eb2ee540a743749094ff4b256d9e7"},"schema_version":"1.0","source":{"id":"2001.09980","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2001.09980","created_at":"2026-07-05T03:12:44Z"},{"alias_kind":"arxiv_version","alias_value":"2001.09980v2","created_at":"2026-07-05T03:12:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2001.09980","created_at":"2026-07-05T03:12:44Z"},{"alias_kind":"pith_short_12","alias_value":"XX3LXHWAG44A","created_at":"2026-07-05T03:12:44Z"},{"alias_kind":"pith_short_16","alias_value":"XX3LXHWAG44AXN2K","created_at":"2026-07-05T03:12:44Z"},{"alias_kind":"pith_short_8","alias_value":"XX3LXHWA","created_at":"2026-07-05T03:12:44Z"}],"graph_snapshots":[{"event_id":"sha256:c1aa1d1b35953e26ffe2b5d62cab89dd4f4802774408213b40dbf27e016dc252","target":"graph","created_at":"2026-07-05T03:12:44Z","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/2001.09980/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"State preparation and measurement (SPAM) errors limit the performance of near-term quantum computers and their potential for practical application. SPAM errors are partly correctable after a calibration step that requires, for a complete implementation on a register of $n$ qubits, $2^n$ additional measurements. Here we introduce an approximate but efficient method for multiqubit SPAM error characterization and mitigation requiring the classical processing of $2^n \\! \\times 2^n$ matrices, but only $O(4^k n^2)$ measurements, where $k=O(1)$ is the number of qubits in a correlation volume. We demo","authors_text":"Michael R. Geller, Mingyu Sun","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2020-01-27T18:57:40Z","title":"Efficient correction of multiqubit measurement errors"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2001.09980","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:c6d4dcc26c0fb5976c5a43b94ae66c9977d31f2dad01f9894bb9c152aede1e22","target":"record","created_at":"2026-07-05T03:12:44Z","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":"497a97aa084556ad14cb839d72d8f65d767442e202f91dd942795b0b262904e4","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2020-01-27T18:57:40Z","title_canon_sha256":"7a3da342aca17e42ff2af43072b9efb5f52eb2ee540a743749094ff4b256d9e7"},"schema_version":"1.0","source":{"id":"2001.09980","kind":"arxiv","version":2}},"canonical_sha256":"bdf6bb9ec037380bb74a62f170850ac819b82e4afab79aae4882793b8aae5442","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"bdf6bb9ec037380bb74a62f170850ac819b82e4afab79aae4882793b8aae5442","first_computed_at":"2026-07-05T03:12:44.276413Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:12:44.276413Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"tcMPkJ0NVYsimZ5uoBSjt3bo9qwjJ0vRp7SVG3OoIWPkqokUcd9IV9CfglsV7yijo6izWycnm8UHZXTSuJ2oBw==","signature_status":"signed_v1","signed_at":"2026-07-05T03:12:44.276811Z","signed_message":"canonical_sha256_bytes"},"source_id":"2001.09980","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c6d4dcc26c0fb5976c5a43b94ae66c9977d31f2dad01f9894bb9c152aede1e22","sha256:c1aa1d1b35953e26ffe2b5d62cab89dd4f4802774408213b40dbf27e016dc252"],"state_sha256":"dfc50c9bf8321f0c7fd5192c5adb4e3b718780cbaea8948d807add3699569b21"}