{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2026:RUHML6T2J3X3KZ2T3SNYVO4XT5","short_pith_number":"pith:RUHML6T2","schema_version":"1.0","canonical_sha256":"8d0ec5fa7a4eefb56753dc9b8abb979f50277396ec31cd99a3f76a59bb4e0f4d","source":{"kind":"arxiv","id":"2606.19239","version":1},"attestation_state":"computed","paper":{"title":"Quantum-Classical Auxiliary-Field Quantum Monte Carlo at the Edge of Practicability","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Fedor \\v{S}imkovic IV, Francesco Nappi, Matthew Kiser","submitted_at":"2026-06-17T16:19:25Z","abstract_excerpt":"We introduce algorithmic improvements to quantum-classical auxiliary-field quantum Monte Carlo (QC-AFQMC) that reduce the dominant per-step classical scaling from $\\tilde{\\mathcal{O}}(N^{5.5})$ to $\\tilde{\\mathcal{O}}(N^{4.5})$ as a function of the number of molecular spin-orbitals $N$. Central to this improvement is the application of Aitken's block transformation to handle singular Pfaffians arising in the estimation of overlaps between a quantum trial state and classical Slater-determinant walkers. Together with the use of algorithmic differentiation for the computation of the force bias, t"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"2606.19239","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2026-06-17T16:19:25Z","cross_cats_sorted":[],"title_canon_sha256":"ebaef5dbca346dc215480671330733d6f9f168f97868aa8bc1752abfb34d128a","abstract_canon_sha256":"cc8468dbe16a3a6c22754e441b262bfea82d5688fed0f97b12ef691f581b9079"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-06-19T16:12:08.598957Z","signature_b64":"sm7mxePMOkEMC3TPErLatfzV71sbBtn9DWFFHL+WM0cz1SzV6jYZGbO0zXgmNbVnGSvIN1byjU4jdTLLjrCqCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8d0ec5fa7a4eefb56753dc9b8abb979f50277396ec31cd99a3f76a59bb4e0f4d","last_reissued_at":"2026-06-19T16:12:08.598621Z","signature_status":"signed_v1","first_computed_at":"2026-06-19T16:12:08.598621Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Quantum-Classical Auxiliary-Field Quantum Monte Carlo at the Edge of Practicability","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Fedor \\v{S}imkovic IV, Francesco Nappi, Matthew Kiser","submitted_at":"2026-06-17T16:19:25Z","abstract_excerpt":"We introduce algorithmic improvements to quantum-classical auxiliary-field quantum Monte Carlo (QC-AFQMC) that reduce the dominant per-step classical scaling from $\\tilde{\\mathcal{O}}(N^{5.5})$ to $\\tilde{\\mathcal{O}}(N^{4.5})$ as a function of the number of molecular spin-orbitals $N$. Central to this improvement is the application of Aitken's block transformation to handle singular Pfaffians arising in the estimation of overlaps between a quantum trial state and classical Slater-determinant walkers. Together with the use of algorithmic differentiation for the computation of the force bias, t"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.19239","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/2606.19239/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"},"aliases":[{"alias_kind":"arxiv","alias_value":"2606.19239","created_at":"2026-06-19T16:12:08.598680+00:00"},{"alias_kind":"arxiv_version","alias_value":"2606.19239v1","created_at":"2026-06-19T16:12:08.598680+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.19239","created_at":"2026-06-19T16:12:08.598680+00:00"},{"alias_kind":"pith_short_12","alias_value":"RUHML6T2J3X3","created_at":"2026-06-19T16:12:08.598680+00:00"},{"alias_kind":"pith_short_16","alias_value":"RUHML6T2J3X3KZ2T","created_at":"2026-06-19T16:12:08.598680+00:00"},{"alias_kind":"pith_short_8","alias_value":"RUHML6T2","created_at":"2026-06-19T16:12:08.598680+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/RUHML6T2J3X3KZ2T3SNYVO4XT5","json":"https://pith.science/pith/RUHML6T2J3X3KZ2T3SNYVO4XT5.json","graph_json":"https://pith.science/api/pith-number/RUHML6T2J3X3KZ2T3SNYVO4XT5/graph.json","events_json":"https://pith.science/api/pith-number/RUHML6T2J3X3KZ2T3SNYVO4XT5/events.json","paper":"https://pith.science/paper/RUHML6T2"},"agent_actions":{"view_html":"https://pith.science/pith/RUHML6T2J3X3KZ2T3SNYVO4XT5","download_json":"https://pith.science/pith/RUHML6T2J3X3KZ2T3SNYVO4XT5.json","view_paper":"https://pith.science/paper/RUHML6T2","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2606.19239&json=true","fetch_graph":"https://pith.science/api/pith-number/RUHML6T2J3X3KZ2T3SNYVO4XT5/graph.json","fetch_events":"https://pith.science/api/pith-number/RUHML6T2J3X3KZ2T3SNYVO4XT5/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/RUHML6T2J3X3KZ2T3SNYVO4XT5/action/timestamp_anchor","attest_storage":"https://pith.science/pith/RUHML6T2J3X3KZ2T3SNYVO4XT5/action/storage_attestation","attest_author":"https://pith.science/pith/RUHML6T2J3X3KZ2T3SNYVO4XT5/action/author_attestation","sign_citation":"https://pith.science/pith/RUHML6T2J3X3KZ2T3SNYVO4XT5/action/citation_signature","submit_replication":"https://pith.science/pith/RUHML6T2J3X3KZ2T3SNYVO4XT5/action/replication_record"}},"created_at":"2026-06-19T16:12:08.598680+00:00","updated_at":"2026-06-19T16:12:08.598680+00:00"}