{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:MXUKPXPSGRITEW6AFLN33BIROC","short_pith_number":"pith:MXUKPXPS","canonical_record":{"source":{"id":"2505.18090","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2025-05-23T16:46:14Z","cross_cats_sorted":[],"title_canon_sha256":"5fba76395d448b78d1981a1a266d9752cdade933f5aabd3cedae5f56e7189900","abstract_canon_sha256":"c3a52868162c749bff37b293e248bd7ca2a73bf099030e3cd8b332c6120065d4"},"schema_version":"1.0"},"canonical_sha256":"65e8a7ddf23451325bc02adbbd85117083004c90b76cb5f8b0f3a498295fc5f2","source":{"kind":"arxiv","id":"2505.18090","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2505.18090","created_at":"2026-07-05T11:20:54Z"},{"alias_kind":"arxiv_version","alias_value":"2505.18090v2","created_at":"2026-07-05T11:20:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2505.18090","created_at":"2026-07-05T11:20:54Z"},{"alias_kind":"pith_short_12","alias_value":"MXUKPXPSGRIT","created_at":"2026-07-05T11:20:54Z"},{"alias_kind":"pith_short_16","alias_value":"MXUKPXPSGRITEW6A","created_at":"2026-07-05T11:20:54Z"},{"alias_kind":"pith_short_8","alias_value":"MXUKPXPS","created_at":"2026-07-05T11:20:54Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:MXUKPXPSGRITEW6AFLN33BIROC","target":"record","payload":{"canonical_record":{"source":{"id":"2505.18090","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2025-05-23T16:46:14Z","cross_cats_sorted":[],"title_canon_sha256":"5fba76395d448b78d1981a1a266d9752cdade933f5aabd3cedae5f56e7189900","abstract_canon_sha256":"c3a52868162c749bff37b293e248bd7ca2a73bf099030e3cd8b332c6120065d4"},"schema_version":"1.0"},"canonical_sha256":"65e8a7ddf23451325bc02adbbd85117083004c90b76cb5f8b0f3a498295fc5f2","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T11:20:54.464848Z","signature_b64":"SpZJB4xjg5Vv0ZhftodwMUbguP3yWisBHRdoP5708j+M7SezQV+E4V2BqjnJTM198xl3Sb2f7FZjnqAyz28uAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"65e8a7ddf23451325bc02adbbd85117083004c90b76cb5f8b0f3a498295fc5f2","last_reissued_at":"2026-07-05T11:20:54.464377Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T11:20:54.464377Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2505.18090","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":"2026-07-05T11:20:54Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"hhGZhH3u9kdLIXjhZuy7CmpYu1dzx0yepU6MRS/9CwD43nYU2yU3xq+s2y1Xx0FruclhIujF1+lWULMPNzVwAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-14T16:18:39.235241Z"},"content_sha256":"776ca20a056290c8f7b31d365e70385f70a467775e13bdc65371fff648518278","schema_version":"1.0","event_id":"sha256:776ca20a056290c8f7b31d365e70385f70a467775e13bdc65371fff648518278"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:MXUKPXPSGRITEW6AFLN33BIROC","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Evaluation of derivatives using approximate generalized parameter shift rule","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Charles Moussa, Evan Philip, Kaonan Micadei, Mario Dagrada, Panagiotis Barkoutsos, Roland Guichard, Vincent E. Elfving, Vytautas Abramavicius","submitted_at":"2025-05-23T16:46:14Z","abstract_excerpt":"Parameter shift rules are instrumental for derivatives estimation in a wide range of quantum algorithms, especially in the context of Quantum Machine Learning. Application of single-gap parameter shift rule is often not possible in algorithms running on noisy intermediate-scale quantum (NISQ) hardware due to noise effects and interaction between device qubits. In such cases, generalized parameter shift rules must be applied yet are computationally expensive for larger systems. In this paper we present the approximate generalized parameter rule (aGPSR) that can handle arbitrary device Hamiltoni"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2505.18090","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2505.18090/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":"2026-07-05T11:20:54Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"n49BQy23rok44kET+bI+J3xWFWAUYXu0MnfBIwMEV1HJkSwiy/53t+4TP2kPJ58qMFTpGe44Gt07f+O6/Gj5Cw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-14T16:18:39.236193Z"},"content_sha256":"4892bd03dec65cf2c6b556cc08a6265a01b44b26e506f84af93603881dca8138","schema_version":"1.0","event_id":"sha256:4892bd03dec65cf2c6b556cc08a6265a01b44b26e506f84af93603881dca8138"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/MXUKPXPSGRITEW6AFLN33BIROC/bundle.json","state_url":"https://pith.science/pith/MXUKPXPSGRITEW6AFLN33BIROC/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/MXUKPXPSGRITEW6AFLN33BIROC/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":"2026-08-14T16:18:39Z","links":{"resolver":"https://pith.science/pith/MXUKPXPSGRITEW6AFLN33BIROC","bundle":"https://pith.science/pith/MXUKPXPSGRITEW6AFLN33BIROC/bundle.json","state":"https://pith.science/pith/MXUKPXPSGRITEW6AFLN33BIROC/state.json","well_known_bundle":"https://pith.science/.well-known/pith/MXUKPXPSGRITEW6AFLN33BIROC/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:MXUKPXPSGRITEW6AFLN33BIROC","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":"c3a52868162c749bff37b293e248bd7ca2a73bf099030e3cd8b332c6120065d4","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2025-05-23T16:46:14Z","title_canon_sha256":"5fba76395d448b78d1981a1a266d9752cdade933f5aabd3cedae5f56e7189900"},"schema_version":"1.0","source":{"id":"2505.18090","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2505.18090","created_at":"2026-07-05T11:20:54Z"},{"alias_kind":"arxiv_version","alias_value":"2505.18090v2","created_at":"2026-07-05T11:20:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2505.18090","created_at":"2026-07-05T11:20:54Z"},{"alias_kind":"pith_short_12","alias_value":"MXUKPXPSGRIT","created_at":"2026-07-05T11:20:54Z"},{"alias_kind":"pith_short_16","alias_value":"MXUKPXPSGRITEW6A","created_at":"2026-07-05T11:20:54Z"},{"alias_kind":"pith_short_8","alias_value":"MXUKPXPS","created_at":"2026-07-05T11:20:54Z"}],"graph_snapshots":[{"event_id":"sha256:4892bd03dec65cf2c6b556cc08a6265a01b44b26e506f84af93603881dca8138","target":"graph","created_at":"2026-07-05T11:20:54Z","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/2505.18090/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Parameter shift rules are instrumental for derivatives estimation in a wide range of quantum algorithms, especially in the context of Quantum Machine Learning. Application of single-gap parameter shift rule is often not possible in algorithms running on noisy intermediate-scale quantum (NISQ) hardware due to noise effects and interaction between device qubits. In such cases, generalized parameter shift rules must be applied yet are computationally expensive for larger systems. In this paper we present the approximate generalized parameter rule (aGPSR) that can handle arbitrary device Hamiltoni","authors_text":"Charles Moussa, Evan Philip, Kaonan Micadei, Mario Dagrada, Panagiotis Barkoutsos, Roland Guichard, Vincent E. Elfving, Vytautas Abramavicius","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2025-05-23T16:46:14Z","title":"Evaluation of derivatives using approximate generalized parameter shift rule"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2505.18090","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":"sha256:776ca20a056290c8f7b31d365e70385f70a467775e13bdc65371fff648518278","target":"record","created_at":"2026-07-05T11:20:54Z","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":"c3a52868162c749bff37b293e248bd7ca2a73bf099030e3cd8b332c6120065d4","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2025-05-23T16:46:14Z","title_canon_sha256":"5fba76395d448b78d1981a1a266d9752cdade933f5aabd3cedae5f56e7189900"},"schema_version":"1.0","source":{"id":"2505.18090","kind":"arxiv","version":2}},"canonical_sha256":"65e8a7ddf23451325bc02adbbd85117083004c90b76cb5f8b0f3a498295fc5f2","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"65e8a7ddf23451325bc02adbbd85117083004c90b76cb5f8b0f3a498295fc5f2","first_computed_at":"2026-07-05T11:20:54.464377Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T11:20:54.464377Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"SpZJB4xjg5Vv0ZhftodwMUbguP3yWisBHRdoP5708j+M7SezQV+E4V2BqjnJTM198xl3Sb2f7FZjnqAyz28uAQ==","signature_status":"signed_v1","signed_at":"2026-07-05T11:20:54.464848Z","signed_message":"canonical_sha256_bytes"},"source_id":"2505.18090","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:776ca20a056290c8f7b31d365e70385f70a467775e13bdc65371fff648518278","sha256:4892bd03dec65cf2c6b556cc08a6265a01b44b26e506f84af93603881dca8138"],"state_sha256":"ed7911a9c4f59f6dad223438b7492a39a167ea5f0cf07f01beb561b977c04ffa"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RZhexNlmB9QUw90TmtkhjP5qxNQSzYVsIQ7IEnlvum2NIp3IkV2iYuE4K5c/wtxc1vxgB+oXaau1Kh5fphcdBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-14T16:18:39.246780Z","bundle_sha256":"16b8711da8020c9ddb5ab8f03f80704d0905de275b25d56f1bb14ab9121fa993"}}