{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:OTZ6IFBTGFKJ4TG56AQQR6YPGV","short_pith_number":"pith:OTZ6IFBT","canonical_record":{"source":{"id":"2507.22550","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"quant-ph","submitted_at":"2025-07-30T10:23:54Z","cross_cats_sorted":["cs.ET"],"title_canon_sha256":"9a9399b328d75c670d982d790696e9ca49a7d097caf33e2440717b237da8d87f","abstract_canon_sha256":"456810b1eb6b3d39d44addfd2a85a4520ba77524c6b934b298e48b9b31894cc8"},"schema_version":"1.0"},"canonical_sha256":"74f3e4143331549e4cddf02108fb0f3572182cedb770e4210582b4cf360cbbce","source":{"kind":"arxiv","id":"2507.22550","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2507.22550","created_at":"2026-07-05T11:45:44Z"},{"alias_kind":"arxiv_version","alias_value":"2507.22550v1","created_at":"2026-07-05T11:45:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2507.22550","created_at":"2026-07-05T11:45:44Z"},{"alias_kind":"pith_short_12","alias_value":"OTZ6IFBTGFKJ","created_at":"2026-07-05T11:45:44Z"},{"alias_kind":"pith_short_16","alias_value":"OTZ6IFBTGFKJ4TG5","created_at":"2026-07-05T11:45:44Z"},{"alias_kind":"pith_short_8","alias_value":"OTZ6IFBT","created_at":"2026-07-05T11:45:44Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:OTZ6IFBTGFKJ4TG56AQQR6YPGV","target":"record","payload":{"canonical_record":{"source":{"id":"2507.22550","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"quant-ph","submitted_at":"2025-07-30T10:23:54Z","cross_cats_sorted":["cs.ET"],"title_canon_sha256":"9a9399b328d75c670d982d790696e9ca49a7d097caf33e2440717b237da8d87f","abstract_canon_sha256":"456810b1eb6b3d39d44addfd2a85a4520ba77524c6b934b298e48b9b31894cc8"},"schema_version":"1.0"},"canonical_sha256":"74f3e4143331549e4cddf02108fb0f3572182cedb770e4210582b4cf360cbbce","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T11:45:44.426086Z","signature_b64":"9wZ2ssp2VNKwMWZsAz6tzElCSS2mpcgIEayqontz/KheqUBPFFbkR8jRJjr/3/DaZBGYmmPyfkKKxV/9IVqWCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"74f3e4143331549e4cddf02108fb0f3572182cedb770e4210582b4cf360cbbce","last_reissued_at":"2026-07-05T11:45:44.425608Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T11:45:44.425608Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2507.22550","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":"2026-07-05T11:45:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"azUcmaMbigjWIto6AbDEpa9LycnaoPPiVuWgxxPE62l61laZ6DbNNMjvn8vozb2y/qp/xeT96BXRB1BiNbm3CQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-10T09:07:58.243773Z"},"content_sha256":"1063489e3e7d069cab30d84260b93cc0e7b6d4218d776ee07254bcb5da1d7939","schema_version":"1.0","event_id":"sha256:1063489e3e7d069cab30d84260b93cc0e7b6d4218d776ee07254bcb5da1d7939"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:OTZ6IFBTGFKJ4TG56AQQR6YPGV","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Hamiltonian Expressibility for Ansatz Selection in Variational Quantum Algorithms","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","headline":"","cross_cats":["cs.ET"],"primary_cat":"quant-ph","authors_text":"Filippo Brozzi, Filippo Caruso, Gloria Turati, Maurizio Ferrari Dacrema, Paolo Cremonesi","submitted_at":"2025-07-30T10:23:54Z","abstract_excerpt":"In the context of Variational Quantum Algorithms (VQAs), selecting an appropriate ansatz is crucial for efficient problem-solving. Hamiltonian expressibility has been introduced as a metric to quantify a circuit's ability to uniformly explore the energy landscape associated with a Hamiltonian ground state search problem. However, its influence on solution quality remains largely unexplored. In this work, we estimate the Hamiltonian expressibility of a well-defined set of circuits applied to various Hamiltonians using a Monte Carlo-based approach. We analyze how ansatz depth influences expressi"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2507.22550","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/2507.22550/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":"2026-07-05T11:45:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Yp8VOzpboIf2sZAcuiiPj9oEvYvmphhao+KXgVMDtlEeGen7/eiCNzy5ELLH5fK61wgtpV/8I+r8IfRKWMTCDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-10T09:07:58.244695Z"},"content_sha256":"9b1335b637659056dcb61395234d18846017562a3423ff1ca8401471920b2757","schema_version":"1.0","event_id":"sha256:9b1335b637659056dcb61395234d18846017562a3423ff1ca8401471920b2757"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/OTZ6IFBTGFKJ4TG56AQQR6YPGV/bundle.json","state_url":"https://pith.science/pith/OTZ6IFBTGFKJ4TG56AQQR6YPGV/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/OTZ6IFBTGFKJ4TG56AQQR6YPGV/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":"2026-08-10T09:07:58Z","links":{"resolver":"https://pith.science/pith/OTZ6IFBTGFKJ4TG56AQQR6YPGV","bundle":"https://pith.science/pith/OTZ6IFBTGFKJ4TG56AQQR6YPGV/bundle.json","state":"https://pith.science/pith/OTZ6IFBTGFKJ4TG56AQQR6YPGV/state.json","well_known_bundle":"https://pith.science/.well-known/pith/OTZ6IFBTGFKJ4TG56AQQR6YPGV/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:OTZ6IFBTGFKJ4TG56AQQR6YPGV","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":"456810b1eb6b3d39d44addfd2a85a4520ba77524c6b934b298e48b9b31894cc8","cross_cats_sorted":["cs.ET"],"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"quant-ph","submitted_at":"2025-07-30T10:23:54Z","title_canon_sha256":"9a9399b328d75c670d982d790696e9ca49a7d097caf33e2440717b237da8d87f"},"schema_version":"1.0","source":{"id":"2507.22550","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2507.22550","created_at":"2026-07-05T11:45:44Z"},{"alias_kind":"arxiv_version","alias_value":"2507.22550v1","created_at":"2026-07-05T11:45:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2507.22550","created_at":"2026-07-05T11:45:44Z"},{"alias_kind":"pith_short_12","alias_value":"OTZ6IFBTGFKJ","created_at":"2026-07-05T11:45:44Z"},{"alias_kind":"pith_short_16","alias_value":"OTZ6IFBTGFKJ4TG5","created_at":"2026-07-05T11:45:44Z"},{"alias_kind":"pith_short_8","alias_value":"OTZ6IFBT","created_at":"2026-07-05T11:45:44Z"}],"graph_snapshots":[{"event_id":"sha256:9b1335b637659056dcb61395234d18846017562a3423ff1ca8401471920b2757","target":"graph","created_at":"2026-07-05T11:45:44Z","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/2507.22550/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"In the context of Variational Quantum Algorithms (VQAs), selecting an appropriate ansatz is crucial for efficient problem-solving. Hamiltonian expressibility has been introduced as a metric to quantify a circuit's ability to uniformly explore the energy landscape associated with a Hamiltonian ground state search problem. However, its influence on solution quality remains largely unexplored. In this work, we estimate the Hamiltonian expressibility of a well-defined set of circuits applied to various Hamiltonians using a Monte Carlo-based approach. We analyze how ansatz depth influences expressi","authors_text":"Filippo Brozzi, Filippo Caruso, Gloria Turati, Maurizio Ferrari Dacrema, Paolo Cremonesi","cross_cats":["cs.ET"],"headline":"","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"quant-ph","submitted_at":"2025-07-30T10:23:54Z","title":"Hamiltonian Expressibility for Ansatz Selection in Variational Quantum Algorithms"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2507.22550","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":"sha256:1063489e3e7d069cab30d84260b93cc0e7b6d4218d776ee07254bcb5da1d7939","target":"record","created_at":"2026-07-05T11:45:44Z","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":"456810b1eb6b3d39d44addfd2a85a4520ba77524c6b934b298e48b9b31894cc8","cross_cats_sorted":["cs.ET"],"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"quant-ph","submitted_at":"2025-07-30T10:23:54Z","title_canon_sha256":"9a9399b328d75c670d982d790696e9ca49a7d097caf33e2440717b237da8d87f"},"schema_version":"1.0","source":{"id":"2507.22550","kind":"arxiv","version":1}},"canonical_sha256":"74f3e4143331549e4cddf02108fb0f3572182cedb770e4210582b4cf360cbbce","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"74f3e4143331549e4cddf02108fb0f3572182cedb770e4210582b4cf360cbbce","first_computed_at":"2026-07-05T11:45:44.425608Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T11:45:44.425608Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"9wZ2ssp2VNKwMWZsAz6tzElCSS2mpcgIEayqontz/KheqUBPFFbkR8jRJjr/3/DaZBGYmmPyfkKKxV/9IVqWCw==","signature_status":"signed_v1","signed_at":"2026-07-05T11:45:44.426086Z","signed_message":"canonical_sha256_bytes"},"source_id":"2507.22550","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1063489e3e7d069cab30d84260b93cc0e7b6d4218d776ee07254bcb5da1d7939","sha256:9b1335b637659056dcb61395234d18846017562a3423ff1ca8401471920b2757"],"state_sha256":"bc7c85b65910d6c9d4b90ec93b5a20d2c06962f3fb46841ca8a82cb5adf4692e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"aPXFRNhyT89WFPdPkibCs7OWYi3lxT5D0TqUUqCJS+x9qrsQQxhBdOs2eIS1u9DYWLDN2AcInSDGjSPbEeT/Dg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-10T09:07:58.252419Z","bundle_sha256":"4d1dbb03fa1ca76f70e708060db6b3ffaa414689c2d76464f961c2196e63430d"}}