{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:STP3YO3FIBQ2RQG74KRT7SXBB2","short_pith_number":"pith:STP3YO3F","canonical_record":{"source":{"id":"2501.01301","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2025-01-02T15:29:47Z","cross_cats_sorted":[],"title_canon_sha256":"288a305bab14d51da62ff5a75ff67ed9e3e6c4ba14ef37ca933a367e3029b2e1","abstract_canon_sha256":"d53eccdc111415b42fa871cbf5cc5574902dcaa088c60541159be2dd6b14842e"},"schema_version":"1.0"},"canonical_sha256":"94dfbc3b654061a8c0dfe2a33fcae10ea8e035ace772c25355dca25b5221199c","source":{"kind":"arxiv","id":"2501.01301","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2501.01301","created_at":"2026-07-05T09:56:17Z"},{"alias_kind":"arxiv_version","alias_value":"2501.01301v1","created_at":"2026-07-05T09:56:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2501.01301","created_at":"2026-07-05T09:56:17Z"},{"alias_kind":"pith_short_12","alias_value":"STP3YO3FIBQ2","created_at":"2026-07-05T09:56:17Z"},{"alias_kind":"pith_short_16","alias_value":"STP3YO3FIBQ2RQG7","created_at":"2026-07-05T09:56:17Z"},{"alias_kind":"pith_short_8","alias_value":"STP3YO3F","created_at":"2026-07-05T09:56:17Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:STP3YO3FIBQ2RQG74KRT7SXBB2","target":"record","payload":{"canonical_record":{"source":{"id":"2501.01301","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2025-01-02T15:29:47Z","cross_cats_sorted":[],"title_canon_sha256":"288a305bab14d51da62ff5a75ff67ed9e3e6c4ba14ef37ca933a367e3029b2e1","abstract_canon_sha256":"d53eccdc111415b42fa871cbf5cc5574902dcaa088c60541159be2dd6b14842e"},"schema_version":"1.0"},"canonical_sha256":"94dfbc3b654061a8c0dfe2a33fcae10ea8e035ace772c25355dca25b5221199c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T09:56:17.720853Z","signature_b64":"6AjRe1+8uLg+UNwrzV2m8kQZCJ98K7HyV/jCpr/Z0McuT/69cxL9oBzxrAQaP0lyJaDeUm/5bOdOa3jeOd2fAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"94dfbc3b654061a8c0dfe2a33fcae10ea8e035ace772c25355dca25b5221199c","last_reissued_at":"2026-07-05T09:56:17.720369Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T09:56:17.720369Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2501.01301","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":"2026-07-05T09:56:17Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0DyzqzvV+xvCbrzGjmfOgZxsyYozjcsZpZTZ93BNMPK72uyabhenJlkc8GSE6Boe1rCll8BnNJm6A87ABLMVBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-07T12:25:41.519502Z"},"content_sha256":"1cec80a4eca764d9892dd64f04c0eb77824e77cd3372aeb3d30e94f909217c6c","schema_version":"1.0","event_id":"sha256:1cec80a4eca764d9892dd64f04c0eb77824e77cd3372aeb3d30e94f909217c6c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:STP3YO3FIBQ2RQG74KRT7SXBB2","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Four-Qubit Variational Algorithms in Silicon Photonics with Integrated Entangled Photon Sources","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Alessio Baldazzi, Lorenzo Pavesi, Massimo Borghi, Matteo Sanna, Stefano Azzini","submitted_at":"2025-01-02T15:29:47Z","abstract_excerpt":"Variational quantum algorithms are hybrid quantum-classical approaches extensively studied for their potential to leverage near-term quantum hardware for computational advantages. In this work, we successfully execute two variational quantum algorithms on a silicon photonic integrated circuit at room temperature: a variational quantum eigensolver for the Hydrogen molecule and a variational quantum factorization for semi-prime numbers. In our reconfigurable silicon photonic circuit, four identical spontaneous-four-wave-mixing-based integrated photon pair sources are used to prepare two path-ent"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2501.01301","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/2501.01301/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":"2026-07-05T09:56:17Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"E+yk6OckE3V/QsgwwFpKGNJlvcSvVGTWpXk55kzeaHjH9vlZVSWa+L+DcDFRDsTo5iDcjcBZlKjd9VIoVtlxAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-07T12:25:41.519874Z"},"content_sha256":"36985393b8b9906cfb882e64b4ee1cd89ebed334044d6da6f823560185c25d38","schema_version":"1.0","event_id":"sha256:36985393b8b9906cfb882e64b4ee1cd89ebed334044d6da6f823560185c25d38"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/STP3YO3FIBQ2RQG74KRT7SXBB2/bundle.json","state_url":"https://pith.science/pith/STP3YO3FIBQ2RQG74KRT7SXBB2/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/STP3YO3FIBQ2RQG74KRT7SXBB2/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":"2026-07-07T12:25:41Z","links":{"resolver":"https://pith.science/pith/STP3YO3FIBQ2RQG74KRT7SXBB2","bundle":"https://pith.science/pith/STP3YO3FIBQ2RQG74KRT7SXBB2/bundle.json","state":"https://pith.science/pith/STP3YO3FIBQ2RQG74KRT7SXBB2/state.json","well_known_bundle":"https://pith.science/.well-known/pith/STP3YO3FIBQ2RQG74KRT7SXBB2/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:STP3YO3FIBQ2RQG74KRT7SXBB2","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":"d53eccdc111415b42fa871cbf5cc5574902dcaa088c60541159be2dd6b14842e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2025-01-02T15:29:47Z","title_canon_sha256":"288a305bab14d51da62ff5a75ff67ed9e3e6c4ba14ef37ca933a367e3029b2e1"},"schema_version":"1.0","source":{"id":"2501.01301","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2501.01301","created_at":"2026-07-05T09:56:17Z"},{"alias_kind":"arxiv_version","alias_value":"2501.01301v1","created_at":"2026-07-05T09:56:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2501.01301","created_at":"2026-07-05T09:56:17Z"},{"alias_kind":"pith_short_12","alias_value":"STP3YO3FIBQ2","created_at":"2026-07-05T09:56:17Z"},{"alias_kind":"pith_short_16","alias_value":"STP3YO3FIBQ2RQG7","created_at":"2026-07-05T09:56:17Z"},{"alias_kind":"pith_short_8","alias_value":"STP3YO3F","created_at":"2026-07-05T09:56:17Z"}],"graph_snapshots":[{"event_id":"sha256:36985393b8b9906cfb882e64b4ee1cd89ebed334044d6da6f823560185c25d38","target":"graph","created_at":"2026-07-05T09:56:17Z","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/2501.01301/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Variational quantum algorithms are hybrid quantum-classical approaches extensively studied for their potential to leverage near-term quantum hardware for computational advantages. In this work, we successfully execute two variational quantum algorithms on a silicon photonic integrated circuit at room temperature: a variational quantum eigensolver for the Hydrogen molecule and a variational quantum factorization for semi-prime numbers. In our reconfigurable silicon photonic circuit, four identical spontaneous-four-wave-mixing-based integrated photon pair sources are used to prepare two path-ent","authors_text":"Alessio Baldazzi, Lorenzo Pavesi, Massimo Borghi, Matteo Sanna, Stefano Azzini","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2025-01-02T15:29:47Z","title":"Four-Qubit Variational Algorithms in Silicon Photonics with Integrated Entangled Photon Sources"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2501.01301","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":"sha256:1cec80a4eca764d9892dd64f04c0eb77824e77cd3372aeb3d30e94f909217c6c","target":"record","created_at":"2026-07-05T09:56:17Z","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":"d53eccdc111415b42fa871cbf5cc5574902dcaa088c60541159be2dd6b14842e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2025-01-02T15:29:47Z","title_canon_sha256":"288a305bab14d51da62ff5a75ff67ed9e3e6c4ba14ef37ca933a367e3029b2e1"},"schema_version":"1.0","source":{"id":"2501.01301","kind":"arxiv","version":1}},"canonical_sha256":"94dfbc3b654061a8c0dfe2a33fcae10ea8e035ace772c25355dca25b5221199c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"94dfbc3b654061a8c0dfe2a33fcae10ea8e035ace772c25355dca25b5221199c","first_computed_at":"2026-07-05T09:56:17.720369Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T09:56:17.720369Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"6AjRe1+8uLg+UNwrzV2m8kQZCJ98K7HyV/jCpr/Z0McuT/69cxL9oBzxrAQaP0lyJaDeUm/5bOdOa3jeOd2fAQ==","signature_status":"signed_v1","signed_at":"2026-07-05T09:56:17.720853Z","signed_message":"canonical_sha256_bytes"},"source_id":"2501.01301","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1cec80a4eca764d9892dd64f04c0eb77824e77cd3372aeb3d30e94f909217c6c","sha256:36985393b8b9906cfb882e64b4ee1cd89ebed334044d6da6f823560185c25d38"],"state_sha256":"e536441bcf83d65018595bd5085a6754a4440691c3cca8ebec819c3d78a088fa"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"u26OUJBHVwP/lXW4gIzL7jVI10bIIxwZuT6fi3DzON4Pc3rAoLe7gjJl71PKszcA7UuXpEJE9n8ES+ZmnU1ABg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-07T12:25:41.521829Z","bundle_sha256":"1504ba46d454456b024b5609748bc4d0dc43d93659b6e9722fb13e5a4b3c4a09"}}