{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:X27TGHXGZXVNOH24IWWRKXLDCS","short_pith_number":"pith:X27TGHXG","canonical_record":{"source":{"id":"1906.00476","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2019-06-02T20:27:10Z","cross_cats_sorted":["cs.DS"],"title_canon_sha256":"f2705a2047480d77dde6fbab60c71ae40e896afb3ccedc9b193a1d931d757e9c","abstract_canon_sha256":"51cb4df536598083caeefaff341d7a726fc0c021317f4ce1e4072590069f3d61"},"schema_version":"1.0"},"canonical_sha256":"bebf331ee6cdead71f5c45ad155d631480aa96de55d7d900cefb2095028daf39","source":{"kind":"arxiv","id":"1906.00476","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1906.00476","created_at":"2026-05-17T23:43:27Z"},{"alias_kind":"arxiv_version","alias_value":"1906.00476v3","created_at":"2026-05-17T23:43:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1906.00476","created_at":"2026-05-17T23:43:27Z"},{"alias_kind":"pith_short_12","alias_value":"X27TGHXGZXVN","created_at":"2026-05-18T12:33:33Z"},{"alias_kind":"pith_short_16","alias_value":"X27TGHXGZXVNOH24","created_at":"2026-05-18T12:33:33Z"},{"alias_kind":"pith_short_8","alias_value":"X27TGHXG","created_at":"2026-05-18T12:33:33Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:X27TGHXGZXVNOH24IWWRKXLDCS","target":"record","payload":{"canonical_record":{"source":{"id":"1906.00476","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2019-06-02T20:27:10Z","cross_cats_sorted":["cs.DS"],"title_canon_sha256":"f2705a2047480d77dde6fbab60c71ae40e896afb3ccedc9b193a1d931d757e9c","abstract_canon_sha256":"51cb4df536598083caeefaff341d7a726fc0c021317f4ce1e4072590069f3d61"},"schema_version":"1.0"},"canonical_sha256":"bebf331ee6cdead71f5c45ad155d631480aa96de55d7d900cefb2095028daf39","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:43:27.540189Z","signature_b64":"C/RwNXWwt1IzHvHnaNIY2p2REAE23nOgClLm5QEiLawSIJ2FLiOP4VoP8U0TxAOQE4K6H7FCL0Ucf19f9eeNAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"bebf331ee6cdead71f5c45ad155d631480aa96de55d7d900cefb2095028daf39","last_reissued_at":"2026-05-17T23:43:27.539659Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:43:27.539659Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1906.00476","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:43:27Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RGZrQRDppPZUw8iEKQ7F3eAb5EykXIGQSRxUlKbjMqJVVESht77GD2YEAjx1BlPEgugFWBEa54XpC6bck8CTBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T05:20:19.797926Z"},"content_sha256":"3eadac9ee289e7353ab450c2c621e1a196aa8bd7e344b7eb0bf206c8f3411ca3","schema_version":"1.0","event_id":"sha256:3eadac9ee289e7353ab450c2c621e1a196aa8bd7e344b7eb0bf206c8f3411ca3"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:X27TGHXGZXVNOH24IWWRKXLDCS","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Noise reduction using past causal cones in variational quantum algorithms","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.DS"],"primary_cat":"quant-ph","authors_text":"Cinthia H. Alderete, C. Monroe, Daiwei Zhu, Isaac H. Kim, Kevin Landsman, Nhung H. Nguyen, Norbert M. Linke, Omar Shehab","submitted_at":"2019-06-02T20:27:10Z","abstract_excerpt":"We introduce an approach to improve the accuracy and reduce the sample complexity of near term quantum-classical algorithms. We construct a simpler initial parameterized quantum state, or ansatz, based on the past causal cone of each observable, generally yielding fewer qubits and gates. We implement this protocol on a trapped ion quantum computer and demonstrate improvement in accuracy and time-to-solution at an arbitrary point in the variational search space. We report a $\\sim 27\\%$ improvement in the accuracy of the calculation of the deuteron binding energy and $\\sim 40\\%$ improvement in t"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1906.00476","kind":"arxiv","version":3},"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":"2026-05-17T23:43:27Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0QW9gdHMtsGz4kf5Gi5TZLoON/LnC6tZeGDjbC0t+0YWNf7+qltrxvbbf0oPtxZyvjjr3A7eP+dRIE++hT+NDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T05:20:19.798278Z"},"content_sha256":"3a5b6046122519d910093d886048a73bff43751f433017581e190faf2d77e240","schema_version":"1.0","event_id":"sha256:3a5b6046122519d910093d886048a73bff43751f433017581e190faf2d77e240"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/X27TGHXGZXVNOH24IWWRKXLDCS/bundle.json","state_url":"https://pith.science/pith/X27TGHXGZXVNOH24IWWRKXLDCS/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/X27TGHXGZXVNOH24IWWRKXLDCS/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":"2026-05-28T05:20:19Z","links":{"resolver":"https://pith.science/pith/X27TGHXGZXVNOH24IWWRKXLDCS","bundle":"https://pith.science/pith/X27TGHXGZXVNOH24IWWRKXLDCS/bundle.json","state":"https://pith.science/pith/X27TGHXGZXVNOH24IWWRKXLDCS/state.json","well_known_bundle":"https://pith.science/.well-known/pith/X27TGHXGZXVNOH24IWWRKXLDCS/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:X27TGHXGZXVNOH24IWWRKXLDCS","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":"51cb4df536598083caeefaff341d7a726fc0c021317f4ce1e4072590069f3d61","cross_cats_sorted":["cs.DS"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2019-06-02T20:27:10Z","title_canon_sha256":"f2705a2047480d77dde6fbab60c71ae40e896afb3ccedc9b193a1d931d757e9c"},"schema_version":"1.0","source":{"id":"1906.00476","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1906.00476","created_at":"2026-05-17T23:43:27Z"},{"alias_kind":"arxiv_version","alias_value":"1906.00476v3","created_at":"2026-05-17T23:43:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1906.00476","created_at":"2026-05-17T23:43:27Z"},{"alias_kind":"pith_short_12","alias_value":"X27TGHXGZXVN","created_at":"2026-05-18T12:33:33Z"},{"alias_kind":"pith_short_16","alias_value":"X27TGHXGZXVNOH24","created_at":"2026-05-18T12:33:33Z"},{"alias_kind":"pith_short_8","alias_value":"X27TGHXG","created_at":"2026-05-18T12:33:33Z"}],"graph_snapshots":[{"event_id":"sha256:3a5b6046122519d910093d886048a73bff43751f433017581e190faf2d77e240","target":"graph","created_at":"2026-05-17T23:43:27Z","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 introduce an approach to improve the accuracy and reduce the sample complexity of near term quantum-classical algorithms. We construct a simpler initial parameterized quantum state, or ansatz, based on the past causal cone of each observable, generally yielding fewer qubits and gates. We implement this protocol on a trapped ion quantum computer and demonstrate improvement in accuracy and time-to-solution at an arbitrary point in the variational search space. We report a $\\sim 27\\%$ improvement in the accuracy of the calculation of the deuteron binding energy and $\\sim 40\\%$ improvement in t","authors_text":"Cinthia H. Alderete, C. Monroe, Daiwei Zhu, Isaac H. Kim, Kevin Landsman, Nhung H. Nguyen, Norbert M. Linke, Omar Shehab","cross_cats":["cs.DS"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2019-06-02T20:27:10Z","title":"Noise reduction using past causal cones in variational quantum algorithms"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1906.00476","kind":"arxiv","version":3},"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":"sha256:3eadac9ee289e7353ab450c2c621e1a196aa8bd7e344b7eb0bf206c8f3411ca3","target":"record","created_at":"2026-05-17T23:43:27Z","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":"51cb4df536598083caeefaff341d7a726fc0c021317f4ce1e4072590069f3d61","cross_cats_sorted":["cs.DS"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2019-06-02T20:27:10Z","title_canon_sha256":"f2705a2047480d77dde6fbab60c71ae40e896afb3ccedc9b193a1d931d757e9c"},"schema_version":"1.0","source":{"id":"1906.00476","kind":"arxiv","version":3}},"canonical_sha256":"bebf331ee6cdead71f5c45ad155d631480aa96de55d7d900cefb2095028daf39","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"bebf331ee6cdead71f5c45ad155d631480aa96de55d7d900cefb2095028daf39","first_computed_at":"2026-05-17T23:43:27.539659Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:43:27.539659Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"C/RwNXWwt1IzHvHnaNIY2p2REAE23nOgClLm5QEiLawSIJ2FLiOP4VoP8U0TxAOQE4K6H7FCL0Ucf19f9eeNAg==","signature_status":"signed_v1","signed_at":"2026-05-17T23:43:27.540189Z","signed_message":"canonical_sha256_bytes"},"source_id":"1906.00476","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3eadac9ee289e7353ab450c2c621e1a196aa8bd7e344b7eb0bf206c8f3411ca3","sha256:3a5b6046122519d910093d886048a73bff43751f433017581e190faf2d77e240"],"state_sha256":"4124d73794709caf2d037ac56e18e7beab28d152fa8ec4c8c4eeab85ed1dfb06"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"aSWAaWswVOJah6IBLB6AbOevx77Pjxlc62q9N35t0l5kFYrs//e1VtDGWkOEKGNjjcWWhc371NsEZDMqr8B3Cw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T05:20:19.800506Z","bundle_sha256":"6c06fabb8726f6db11e40448df75285b7bedf260656443cf0569fda05e4d0591"}}