{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:KGLTS3QEPKXGZDW3UKQ7T2NUDV","short_pith_number":"pith:KGLTS3QE","canonical_record":{"source":{"id":"2601.09462","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.stat-mech","submitted_at":"2026-01-14T13:15:39Z","cross_cats_sorted":[],"title_canon_sha256":"a11c44f28b02b00be82f4766647322e3bd4cd67a8ea384256691975014279ca2","abstract_canon_sha256":"ea2316589b83347cfcc702235f07a7bee2b54eb002c249fcf8564f74aa617764"},"schema_version":"1.0"},"canonical_sha256":"5197396e047aae6c8edba2a1f9e9b41d7ca56df16e83b97f3a2afefdb79c97e8","source":{"kind":"arxiv","id":"2601.09462","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2601.09462","created_at":"2026-06-19T16:11:19Z"},{"alias_kind":"arxiv_version","alias_value":"2601.09462v1","created_at":"2026-06-19T16:11:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2601.09462","created_at":"2026-06-19T16:11:19Z"},{"alias_kind":"pith_short_12","alias_value":"KGLTS3QEPKXG","created_at":"2026-06-19T16:11:19Z"},{"alias_kind":"pith_short_16","alias_value":"KGLTS3QEPKXGZDW3","created_at":"2026-06-19T16:11:19Z"},{"alias_kind":"pith_short_8","alias_value":"KGLTS3QE","created_at":"2026-06-19T16:11:19Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:KGLTS3QEPKXGZDW3UKQ7T2NUDV","target":"record","payload":{"canonical_record":{"source":{"id":"2601.09462","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.stat-mech","submitted_at":"2026-01-14T13:15:39Z","cross_cats_sorted":[],"title_canon_sha256":"a11c44f28b02b00be82f4766647322e3bd4cd67a8ea384256691975014279ca2","abstract_canon_sha256":"ea2316589b83347cfcc702235f07a7bee2b54eb002c249fcf8564f74aa617764"},"schema_version":"1.0"},"canonical_sha256":"5197396e047aae6c8edba2a1f9e9b41d7ca56df16e83b97f3a2afefdb79c97e8","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-06-19T16:11:19.299901Z","signature_b64":"noqmC+l7kOqOWaQZWnvyzbifM6bfTM/zG9WNROrF+PVpUQ8NdAYbLXZqGGxoF7LDWqDl7acVRxW8+aK57w/ABw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5197396e047aae6c8edba2a1f9e9b41d7ca56df16e83b97f3a2afefdb79c97e8","last_reissued_at":"2026-06-19T16:11:19.299552Z","signature_status":"signed_v1","first_computed_at":"2026-06-19T16:11:19.299552Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2601.09462","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":"2026-06-19T16:11:19Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xtllpT57zOOl/dvhRiIkDltuPlZgLczEi/HVrYp+F1qy1uU4WVsQmWE6F+4mtqaZhP2IC0qRelq12aR28nOIBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-07T09:22:01.741251Z"},"content_sha256":"4bd6ae5257337afb3d8274d03876ab46b20b047f1e7745d18aecd0a7793eba03","schema_version":"1.0","event_id":"sha256:4bd6ae5257337afb3d8274d03876ab46b20b047f1e7745d18aecd0a7793eba03"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:KGLTS3QEPKXGZDW3UKQ7T2NUDV","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Structural Comparison of Error Mitigation Methods for Ising Machines: Penalty-Spin Model versus Stacked Model","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.stat-mech","authors_text":"Kanta Hino, Shu Tanaka, Tetsuro Abe","submitted_at":"2026-01-14T13:15:39Z","abstract_excerpt":"Error-mitigation methods for Ising machines are reexamined not merely as noise-suppression techniques but as a structural design problem of replica-coupled Ising models. Using simulated annealing as a hardware-noise-free testbed, we systematically compare the penalty-spin (PS) model, which couples replicas through a centralized auxiliary layer, with the stacked model, which couples adjacent replicas directly. Numerical experiments on the quadratic assignment problem reveal that the ferromagnetically coupled stacked model stably maintains constraint satisfaction and improves solution quality ov"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2601.09462","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/2601.09462/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":"2026-06-19T16:11:19Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"cQaqEaUa1P7WMzM2c9wuBAN2DS8HSsNoYj5wTbzBYh1AcPGQ2hB3LzB9X/WjZonZ+Mwi3zRVmeVshbSGn7loAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-07T09:22:01.741717Z"},"content_sha256":"e717ffc60aec116a85ad51af259f1999958e0b0b40ab770eb2fa157388e2012f","schema_version":"1.0","event_id":"sha256:e717ffc60aec116a85ad51af259f1999958e0b0b40ab770eb2fa157388e2012f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/KGLTS3QEPKXGZDW3UKQ7T2NUDV/bundle.json","state_url":"https://pith.science/pith/KGLTS3QEPKXGZDW3UKQ7T2NUDV/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/KGLTS3QEPKXGZDW3UKQ7T2NUDV/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":"2026-08-07T09:22:01Z","links":{"resolver":"https://pith.science/pith/KGLTS3QEPKXGZDW3UKQ7T2NUDV","bundle":"https://pith.science/pith/KGLTS3QEPKXGZDW3UKQ7T2NUDV/bundle.json","state":"https://pith.science/pith/KGLTS3QEPKXGZDW3UKQ7T2NUDV/state.json","well_known_bundle":"https://pith.science/.well-known/pith/KGLTS3QEPKXGZDW3UKQ7T2NUDV/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:KGLTS3QEPKXGZDW3UKQ7T2NUDV","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":"ea2316589b83347cfcc702235f07a7bee2b54eb002c249fcf8564f74aa617764","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.stat-mech","submitted_at":"2026-01-14T13:15:39Z","title_canon_sha256":"a11c44f28b02b00be82f4766647322e3bd4cd67a8ea384256691975014279ca2"},"schema_version":"1.0","source":{"id":"2601.09462","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2601.09462","created_at":"2026-06-19T16:11:19Z"},{"alias_kind":"arxiv_version","alias_value":"2601.09462v1","created_at":"2026-06-19T16:11:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2601.09462","created_at":"2026-06-19T16:11:19Z"},{"alias_kind":"pith_short_12","alias_value":"KGLTS3QEPKXG","created_at":"2026-06-19T16:11:19Z"},{"alias_kind":"pith_short_16","alias_value":"KGLTS3QEPKXGZDW3","created_at":"2026-06-19T16:11:19Z"},{"alias_kind":"pith_short_8","alias_value":"KGLTS3QE","created_at":"2026-06-19T16:11:19Z"}],"graph_snapshots":[{"event_id":"sha256:e717ffc60aec116a85ad51af259f1999958e0b0b40ab770eb2fa157388e2012f","target":"graph","created_at":"2026-06-19T16:11:19Z","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/2601.09462/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Error-mitigation methods for Ising machines are reexamined not merely as noise-suppression techniques but as a structural design problem of replica-coupled Ising models. Using simulated annealing as a hardware-noise-free testbed, we systematically compare the penalty-spin (PS) model, which couples replicas through a centralized auxiliary layer, with the stacked model, which couples adjacent replicas directly. Numerical experiments on the quadratic assignment problem reveal that the ferromagnetically coupled stacked model stably maintains constraint satisfaction and improves solution quality ov","authors_text":"Kanta Hino, Shu Tanaka, Tetsuro Abe","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.stat-mech","submitted_at":"2026-01-14T13:15:39Z","title":"Structural Comparison of Error Mitigation Methods for Ising Machines: Penalty-Spin Model versus Stacked Model"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2601.09462","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":"sha256:4bd6ae5257337afb3d8274d03876ab46b20b047f1e7745d18aecd0a7793eba03","target":"record","created_at":"2026-06-19T16:11:19Z","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":"ea2316589b83347cfcc702235f07a7bee2b54eb002c249fcf8564f74aa617764","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.stat-mech","submitted_at":"2026-01-14T13:15:39Z","title_canon_sha256":"a11c44f28b02b00be82f4766647322e3bd4cd67a8ea384256691975014279ca2"},"schema_version":"1.0","source":{"id":"2601.09462","kind":"arxiv","version":1}},"canonical_sha256":"5197396e047aae6c8edba2a1f9e9b41d7ca56df16e83b97f3a2afefdb79c97e8","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5197396e047aae6c8edba2a1f9e9b41d7ca56df16e83b97f3a2afefdb79c97e8","first_computed_at":"2026-06-19T16:11:19.299552Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-06-19T16:11:19.299552Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"noqmC+l7kOqOWaQZWnvyzbifM6bfTM/zG9WNROrF+PVpUQ8NdAYbLXZqGGxoF7LDWqDl7acVRxW8+aK57w/ABw==","signature_status":"signed_v1","signed_at":"2026-06-19T16:11:19.299901Z","signed_message":"canonical_sha256_bytes"},"source_id":"2601.09462","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4bd6ae5257337afb3d8274d03876ab46b20b047f1e7745d18aecd0a7793eba03","sha256:e717ffc60aec116a85ad51af259f1999958e0b0b40ab770eb2fa157388e2012f"],"state_sha256":"7615bd0098d0d4ae7a04c7d4abc387450d86050664494b003571e43450370cfb"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NjT4Lt9dU1ZutFszDuusPimLjRy1+YFWnjTiRYlqsWHSZxu8EOTyWs5rOMKv3Z7gqcFYnXL9P52ae9c55ZOhAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-07T09:22:01.746413Z","bundle_sha256":"0863fdf745875241e1a912c498d2347f6f9d3f888038c2d88d1025ee0fda78c9"}}