{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2007:HNZLNDJDR4CQSRY5QMAH2SJ2XZ","short_pith_number":"pith:HNZLNDJD","canonical_record":{"source":{"id":"0709.1718","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"cond-mat.stat-mech","submitted_at":"2007-09-11T20:33:30Z","cross_cats_sorted":["cond-mat.dis-nn","cond-mat.mes-hall","cond-mat.mtrl-sci","cond-mat.other","cond-mat.soft"],"title_canon_sha256":"176a6427c5efea249e6cbceb4aa4f229a24e0ffcd84f343de4ce824edaea6f2e","abstract_canon_sha256":"bad34480df6e09c73be956bbb20f5cca7ae4b5254ac7ba43edd0b320152f5354"},"schema_version":"1.0"},"canonical_sha256":"3b72b68d238f0509471d83007d493abe4c774c4da00d9f229245280508d420cd","source":{"kind":"arxiv","id":"0709.1718","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0709.1718","created_at":"2026-05-18T01:05:14Z"},{"alias_kind":"arxiv_version","alias_value":"0709.1718v2","created_at":"2026-05-18T01:05:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0709.1718","created_at":"2026-05-18T01:05:14Z"},{"alias_kind":"pith_short_12","alias_value":"HNZLNDJDR4CQ","created_at":"2026-05-18T12:25:55Z"},{"alias_kind":"pith_short_16","alias_value":"HNZLNDJDR4CQSRY5","created_at":"2026-05-18T12:25:55Z"},{"alias_kind":"pith_short_8","alias_value":"HNZLNDJD","created_at":"2026-05-18T12:25:55Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2007:HNZLNDJDR4CQSRY5QMAH2SJ2XZ","target":"record","payload":{"canonical_record":{"source":{"id":"0709.1718","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"cond-mat.stat-mech","submitted_at":"2007-09-11T20:33:30Z","cross_cats_sorted":["cond-mat.dis-nn","cond-mat.mes-hall","cond-mat.mtrl-sci","cond-mat.other","cond-mat.soft"],"title_canon_sha256":"176a6427c5efea249e6cbceb4aa4f229a24e0ffcd84f343de4ce824edaea6f2e","abstract_canon_sha256":"bad34480df6e09c73be956bbb20f5cca7ae4b5254ac7ba43edd0b320152f5354"},"schema_version":"1.0"},"canonical_sha256":"3b72b68d238f0509471d83007d493abe4c774c4da00d9f229245280508d420cd","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:05:14.032075Z","signature_b64":"5VXaSrpjUwZL3gJMii9gyr20q/yhnkvJOHEeyfchbztUHClacYWZlxNRr5+CaEPL2ZfBTQRqgJIXdv7ZY4RDDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3b72b68d238f0509471d83007d493abe4c774c4da00d9f229245280508d420cd","last_reissued_at":"2026-05-18T01:05:14.031428Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:05:14.031428Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0709.1718","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:05:14Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lljyoLOL9vqfdO1u3vXV6to0ho06H+VChrA2cV7ceyYNtfgjsmQpQaJYKcO/C5njzdeI3dKv7yD6kxpAdO4dBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T10:57:47.771974Z"},"content_sha256":"59962817738dd3140263733db8dc4e9781a927c01bbd89828b9b40c47ba4d860","schema_version":"1.0","event_id":"sha256:59962817738dd3140263733db8dc4e9781a927c01bbd89828b9b40c47ba4d860"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2007:HNZLNDJDR4CQSRY5QMAH2SJ2XZ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A short-loop algorithm for quantum Monte Carlo simulations","license":"","headline":"","cross_cats":["cond-mat.dis-nn","cond-mat.mes-hall","cond-mat.mtrl-sci","cond-mat.other","cond-mat.soft"],"primary_cat":"cond-mat.stat-mech","authors_text":"Roger G. Melko, Ying-Jer Kao","submitted_at":"2007-09-11T20:33:30Z","abstract_excerpt":"We present an algorithmic framework for a variant of the quantum Monte Carlo operator-loop algorithm, where non-local cluster updates are constructed in a way that makes each individual loop smaller. The algorithm is designed to increase simulation efficiency in cases where conventional loops become very large, do not close altogether, or otherwise behave poorly. We demonstrate and characterize some aspects of the short-loop on a square lattice spin-1/2 XXZ model where, remarkably, a significant increase in simulation efficiency is observed in some parameter regimes. The simplicity of the mode"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0709.1718","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"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":"2026-05-18T01:05:14Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4xkQLqvT0RmBPQ42hWPBB477Ka/2s2vCfTK3QNN+ImM4i07ph9FxWbe5XMXVnCIOMhTrw3KobekPlLMgJLH4BQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T10:57:47.772761Z"},"content_sha256":"31227b3b084d6c50cad966e7ca91a97314c6d5c28581c3053e16a1281d257b8a","schema_version":"1.0","event_id":"sha256:31227b3b084d6c50cad966e7ca91a97314c6d5c28581c3053e16a1281d257b8a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/HNZLNDJDR4CQSRY5QMAH2SJ2XZ/bundle.json","state_url":"https://pith.science/pith/HNZLNDJDR4CQSRY5QMAH2SJ2XZ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/HNZLNDJDR4CQSRY5QMAH2SJ2XZ/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":"2026-05-27T10:57:47Z","links":{"resolver":"https://pith.science/pith/HNZLNDJDR4CQSRY5QMAH2SJ2XZ","bundle":"https://pith.science/pith/HNZLNDJDR4CQSRY5QMAH2SJ2XZ/bundle.json","state":"https://pith.science/pith/HNZLNDJDR4CQSRY5QMAH2SJ2XZ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/HNZLNDJDR4CQSRY5QMAH2SJ2XZ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2007:HNZLNDJDR4CQSRY5QMAH2SJ2XZ","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":"bad34480df6e09c73be956bbb20f5cca7ae4b5254ac7ba43edd0b320152f5354","cross_cats_sorted":["cond-mat.dis-nn","cond-mat.mes-hall","cond-mat.mtrl-sci","cond-mat.other","cond-mat.soft"],"license":"","primary_cat":"cond-mat.stat-mech","submitted_at":"2007-09-11T20:33:30Z","title_canon_sha256":"176a6427c5efea249e6cbceb4aa4f229a24e0ffcd84f343de4ce824edaea6f2e"},"schema_version":"1.0","source":{"id":"0709.1718","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0709.1718","created_at":"2026-05-18T01:05:14Z"},{"alias_kind":"arxiv_version","alias_value":"0709.1718v2","created_at":"2026-05-18T01:05:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0709.1718","created_at":"2026-05-18T01:05:14Z"},{"alias_kind":"pith_short_12","alias_value":"HNZLNDJDR4CQ","created_at":"2026-05-18T12:25:55Z"},{"alias_kind":"pith_short_16","alias_value":"HNZLNDJDR4CQSRY5","created_at":"2026-05-18T12:25:55Z"},{"alias_kind":"pith_short_8","alias_value":"HNZLNDJD","created_at":"2026-05-18T12:25:55Z"}],"graph_snapshots":[{"event_id":"sha256:31227b3b084d6c50cad966e7ca91a97314c6d5c28581c3053e16a1281d257b8a","target":"graph","created_at":"2026-05-18T01:05:14Z","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"},"paper":{"abstract_excerpt":"We present an algorithmic framework for a variant of the quantum Monte Carlo operator-loop algorithm, where non-local cluster updates are constructed in a way that makes each individual loop smaller. The algorithm is designed to increase simulation efficiency in cases where conventional loops become very large, do not close altogether, or otherwise behave poorly. We demonstrate and characterize some aspects of the short-loop on a square lattice spin-1/2 XXZ model where, remarkably, a significant increase in simulation efficiency is observed in some parameter regimes. The simplicity of the mode","authors_text":"Roger G. Melko, Ying-Jer Kao","cross_cats":["cond-mat.dis-nn","cond-mat.mes-hall","cond-mat.mtrl-sci","cond-mat.other","cond-mat.soft"],"headline":"","license":"","primary_cat":"cond-mat.stat-mech","submitted_at":"2007-09-11T20:33:30Z","title":"A short-loop algorithm for quantum Monte Carlo simulations"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0709.1718","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":"sha256:59962817738dd3140263733db8dc4e9781a927c01bbd89828b9b40c47ba4d860","target":"record","created_at":"2026-05-18T01:05:14Z","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":"bad34480df6e09c73be956bbb20f5cca7ae4b5254ac7ba43edd0b320152f5354","cross_cats_sorted":["cond-mat.dis-nn","cond-mat.mes-hall","cond-mat.mtrl-sci","cond-mat.other","cond-mat.soft"],"license":"","primary_cat":"cond-mat.stat-mech","submitted_at":"2007-09-11T20:33:30Z","title_canon_sha256":"176a6427c5efea249e6cbceb4aa4f229a24e0ffcd84f343de4ce824edaea6f2e"},"schema_version":"1.0","source":{"id":"0709.1718","kind":"arxiv","version":2}},"canonical_sha256":"3b72b68d238f0509471d83007d493abe4c774c4da00d9f229245280508d420cd","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3b72b68d238f0509471d83007d493abe4c774c4da00d9f229245280508d420cd","first_computed_at":"2026-05-18T01:05:14.031428Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:05:14.031428Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"5VXaSrpjUwZL3gJMii9gyr20q/yhnkvJOHEeyfchbztUHClacYWZlxNRr5+CaEPL2ZfBTQRqgJIXdv7ZY4RDDQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:05:14.032075Z","signed_message":"canonical_sha256_bytes"},"source_id":"0709.1718","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:59962817738dd3140263733db8dc4e9781a927c01bbd89828b9b40c47ba4d860","sha256:31227b3b084d6c50cad966e7ca91a97314c6d5c28581c3053e16a1281d257b8a"],"state_sha256":"7e7112dc9c26ca7e83cdef2373093c8fa7d93c7eb66efa81405068db9169ef32"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"MB6VDI3O5UPREsrzMcRAZZfbbHSVpiyaec9/7i5tC6zUYHfA91gVc4J7IeQEjeppAC9qPLY4prS5vC34p+KLDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T10:57:47.776991Z","bundle_sha256":"421330e3be9a518345302ea22ac5aef361f6fd49c75602e008c04c25c3dd2081"}}