{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:IWNETXF6T34MO4WQR2YDRAIMP5","short_pith_number":"pith:IWNETXF6","canonical_record":{"source":{"id":"2501.18069","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2025-01-30T00:28:50Z","cross_cats_sorted":["cond-mat.stat-mech"],"title_canon_sha256":"5b02fa026136f613e3786b8d2f010dc7c2018566bd51a793cc5ab1cdab9f296c","abstract_canon_sha256":"8f30e9d51ccab645eb86b2e84f1eb3f387f77d0a11ef0a4baa37c2399b4ea885"},"schema_version":"1.0"},"canonical_sha256":"459a49dcbe9ef8c772d08eb038810c7f5c031aad4a4277e941fe8447fb7fc4c3","source":{"kind":"arxiv","id":"2501.18069","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2501.18069","created_at":"2026-07-05T10:07:06Z"},{"alias_kind":"arxiv_version","alias_value":"2501.18069v1","created_at":"2026-07-05T10:07:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2501.18069","created_at":"2026-07-05T10:07:06Z"},{"alias_kind":"pith_short_12","alias_value":"IWNETXF6T34M","created_at":"2026-07-05T10:07:06Z"},{"alias_kind":"pith_short_16","alias_value":"IWNETXF6T34MO4WQ","created_at":"2026-07-05T10:07:06Z"},{"alias_kind":"pith_short_8","alias_value":"IWNETXF6","created_at":"2026-07-05T10:07:06Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:IWNETXF6T34MO4WQR2YDRAIMP5","target":"record","payload":{"canonical_record":{"source":{"id":"2501.18069","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2025-01-30T00:28:50Z","cross_cats_sorted":["cond-mat.stat-mech"],"title_canon_sha256":"5b02fa026136f613e3786b8d2f010dc7c2018566bd51a793cc5ab1cdab9f296c","abstract_canon_sha256":"8f30e9d51ccab645eb86b2e84f1eb3f387f77d0a11ef0a4baa37c2399b4ea885"},"schema_version":"1.0"},"canonical_sha256":"459a49dcbe9ef8c772d08eb038810c7f5c031aad4a4277e941fe8447fb7fc4c3","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T10:07:06.557452Z","signature_b64":"ELY3/RHRQoxdeObV0UkUscswP3TsjyyTviaxsNaS+fw8lYDQazjh5QndCGiExxiBVbaiqisZ9UaNXIhq1cZkAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"459a49dcbe9ef8c772d08eb038810c7f5c031aad4a4277e941fe8447fb7fc4c3","last_reissued_at":"2026-07-05T10:07:06.557022Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T10:07:06.557022Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2501.18069","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":"2026-07-05T10:07:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QZNXDLd8ZZ3QTQloNDTu4f14PTHJrIYpMzoBRRY6wxNXq/pdscN4sShI2kRu5FG4ZlEunrvBRx/9NfE1AZAYAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-31T21:01:27.404190Z"},"content_sha256":"85e54b5154bc18f71f414e63b096631e31093c5937a39a74b9603ed2045e3ef5","schema_version":"1.0","event_id":"sha256:85e54b5154bc18f71f414e63b096631e31093c5937a39a74b9603ed2045e3ef5"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:IWNETXF6T34MO4WQR2YDRAIMP5","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Local Basis Transformation to Mitigate Negative Sign Problems","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.stat-mech"],"primary_cat":"cond-mat.str-el","authors_text":"Keisuke Murota, Synge Todo","submitted_at":"2025-01-30T00:28:50Z","abstract_excerpt":"Quantum Monte Carlo (QMC) methods for the frustrated quantum spin systems occasionally suffer from the negative sign problem, which makes simulations exponentially harder for larger systems at lower temperatures and severely limits QMC's application across a wide range of spin systems. This problem is known to depend on the choice of representation basis. We propose a systematic approach for mitigating the sign problem independent of the given Hamiltonian or lattice structure. We first introduce the concept of negativity to characterize the severity of the negative sign problem. We then demons"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2501.18069","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/2501.18069/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":"2026-07-05T10:07:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"JLG7rZ5S0Pm+6L0Zzqdq8yiCQS7zbNDHSKHLf1OrloIXOYOCSdfXlnBSuvIwpfYCMwhSkKE1lOTjMRcU/dwCBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-31T21:01:27.404795Z"},"content_sha256":"68f91da650e22ae1101871dd9c072546ccac69cc9b929af1a6526fba1423d9a6","schema_version":"1.0","event_id":"sha256:68f91da650e22ae1101871dd9c072546ccac69cc9b929af1a6526fba1423d9a6"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/IWNETXF6T34MO4WQR2YDRAIMP5/bundle.json","state_url":"https://pith.science/pith/IWNETXF6T34MO4WQR2YDRAIMP5/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/IWNETXF6T34MO4WQR2YDRAIMP5/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":"2026-07-31T21:01:27Z","links":{"resolver":"https://pith.science/pith/IWNETXF6T34MO4WQR2YDRAIMP5","bundle":"https://pith.science/pith/IWNETXF6T34MO4WQR2YDRAIMP5/bundle.json","state":"https://pith.science/pith/IWNETXF6T34MO4WQR2YDRAIMP5/state.json","well_known_bundle":"https://pith.science/.well-known/pith/IWNETXF6T34MO4WQR2YDRAIMP5/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:IWNETXF6T34MO4WQR2YDRAIMP5","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":"8f30e9d51ccab645eb86b2e84f1eb3f387f77d0a11ef0a4baa37c2399b4ea885","cross_cats_sorted":["cond-mat.stat-mech"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2025-01-30T00:28:50Z","title_canon_sha256":"5b02fa026136f613e3786b8d2f010dc7c2018566bd51a793cc5ab1cdab9f296c"},"schema_version":"1.0","source":{"id":"2501.18069","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2501.18069","created_at":"2026-07-05T10:07:06Z"},{"alias_kind":"arxiv_version","alias_value":"2501.18069v1","created_at":"2026-07-05T10:07:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2501.18069","created_at":"2026-07-05T10:07:06Z"},{"alias_kind":"pith_short_12","alias_value":"IWNETXF6T34M","created_at":"2026-07-05T10:07:06Z"},{"alias_kind":"pith_short_16","alias_value":"IWNETXF6T34MO4WQ","created_at":"2026-07-05T10:07:06Z"},{"alias_kind":"pith_short_8","alias_value":"IWNETXF6","created_at":"2026-07-05T10:07:06Z"}],"graph_snapshots":[{"event_id":"sha256:68f91da650e22ae1101871dd9c072546ccac69cc9b929af1a6526fba1423d9a6","target":"graph","created_at":"2026-07-05T10:07:06Z","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/2501.18069/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Quantum Monte Carlo (QMC) methods for the frustrated quantum spin systems occasionally suffer from the negative sign problem, which makes simulations exponentially harder for larger systems at lower temperatures and severely limits QMC's application across a wide range of spin systems. This problem is known to depend on the choice of representation basis. We propose a systematic approach for mitigating the sign problem independent of the given Hamiltonian or lattice structure. We first introduce the concept of negativity to characterize the severity of the negative sign problem. We then demons","authors_text":"Keisuke Murota, Synge Todo","cross_cats":["cond-mat.stat-mech"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2025-01-30T00:28:50Z","title":"Local Basis Transformation to Mitigate Negative Sign Problems"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2501.18069","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":"sha256:85e54b5154bc18f71f414e63b096631e31093c5937a39a74b9603ed2045e3ef5","target":"record","created_at":"2026-07-05T10:07:06Z","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":"8f30e9d51ccab645eb86b2e84f1eb3f387f77d0a11ef0a4baa37c2399b4ea885","cross_cats_sorted":["cond-mat.stat-mech"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2025-01-30T00:28:50Z","title_canon_sha256":"5b02fa026136f613e3786b8d2f010dc7c2018566bd51a793cc5ab1cdab9f296c"},"schema_version":"1.0","source":{"id":"2501.18069","kind":"arxiv","version":1}},"canonical_sha256":"459a49dcbe9ef8c772d08eb038810c7f5c031aad4a4277e941fe8447fb7fc4c3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"459a49dcbe9ef8c772d08eb038810c7f5c031aad4a4277e941fe8447fb7fc4c3","first_computed_at":"2026-07-05T10:07:06.557022Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T10:07:06.557022Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ELY3/RHRQoxdeObV0UkUscswP3TsjyyTviaxsNaS+fw8lYDQazjh5QndCGiExxiBVbaiqisZ9UaNXIhq1cZkAA==","signature_status":"signed_v1","signed_at":"2026-07-05T10:07:06.557452Z","signed_message":"canonical_sha256_bytes"},"source_id":"2501.18069","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:85e54b5154bc18f71f414e63b096631e31093c5937a39a74b9603ed2045e3ef5","sha256:68f91da650e22ae1101871dd9c072546ccac69cc9b929af1a6526fba1423d9a6"],"state_sha256":"16e232a4965b51f22b1fd35d97105ab581f91fce123bccef7363defc2db68dfd"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dt3lzFqAhIz+aMkpYGAQAcH+PL/svqg66cpr79ooSFbx+q3u4cVSLRCvniTBY9X1OG6uCnrIvqbwyZgZjI6ODw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-31T21:01:27.408980Z","bundle_sha256":"13ace524aa17f0a6e8305271bad2c1ebbd6b87015a90a7137553e097881e3d26"}}