{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:4DAOTF4UPTXL355WAN7S246M53","short_pith_number":"pith:4DAOTF4U","canonical_record":{"source":{"id":"2102.08403","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2021-02-16T19:00:05Z","cross_cats_sorted":["cond-mat.str-el"],"title_canon_sha256":"cbaef05d98bb77d83c2458893161006d05d0a78715586732b43b4bb840b55f38","abstract_canon_sha256":"a740c43e308c43cc628c23b66a20f51798c15a52502e48c83ba6e54d04c4145e"},"schema_version":"1.0"},"canonical_sha256":"e0c0e997947ceebdf7b6037f2d73cceec0b05daf0e7d8663a92ea0fe04ad68b8","source":{"kind":"arxiv","id":"2102.08403","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2102.08403","created_at":"2026-07-05T02:16:02Z"},{"alias_kind":"arxiv_version","alias_value":"2102.08403v1","created_at":"2026-07-05T02:16:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2102.08403","created_at":"2026-07-05T02:16:02Z"},{"alias_kind":"pith_short_12","alias_value":"4DAOTF4UPTXL","created_at":"2026-07-05T02:16:02Z"},{"alias_kind":"pith_short_16","alias_value":"4DAOTF4UPTXL355W","created_at":"2026-07-05T02:16:02Z"},{"alias_kind":"pith_short_8","alias_value":"4DAOTF4U","created_at":"2026-07-05T02:16:02Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:4DAOTF4UPTXL355WAN7S246M53","target":"record","payload":{"canonical_record":{"source":{"id":"2102.08403","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2021-02-16T19:00:05Z","cross_cats_sorted":["cond-mat.str-el"],"title_canon_sha256":"cbaef05d98bb77d83c2458893161006d05d0a78715586732b43b4bb840b55f38","abstract_canon_sha256":"a740c43e308c43cc628c23b66a20f51798c15a52502e48c83ba6e54d04c4145e"},"schema_version":"1.0"},"canonical_sha256":"e0c0e997947ceebdf7b6037f2d73cceec0b05daf0e7d8663a92ea0fe04ad68b8","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:16:02.443249Z","signature_b64":"Iz2sgjMGPkQp6fALsUejL0U7doxpW3bf7QDUwTA6zjlUUihuitjT9X/OZqL3t3KDQ9wMBcXBMYiJk4StYQTSAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e0c0e997947ceebdf7b6037f2d73cceec0b05daf0e7d8663a92ea0fe04ad68b8","last_reissued_at":"2026-07-05T02:16:02.442794Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:16:02.442794Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2102.08403","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":"2026-07-05T02:16:02Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"s1LlfK/P5/8JhTSqWJHv+xNIt7n/MeQ/lcxFaTqtJsi19aO7IpjeEa3saKsiX3gpCo/ZR3V8vtENsaiGG+wUCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-06T20:45:40.294226Z"},"content_sha256":"882266bc54aac6142ff8f9404ff23326094b163c832257bacf00f266f2e8b38a","schema_version":"1.0","event_id":"sha256:882266bc54aac6142ff8f9404ff23326094b163c832257bacf00f266f2e8b38a"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:4DAOTF4UPTXL355WAN7S246M53","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Unitary Block Optimization for Variational Quantum Algorithms","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.str-el"],"primary_cat":"quant-ph","authors_text":"Benjamin Villalonga, Bryan K. Clark, Lucas Slattery","submitted_at":"2021-02-16T19:00:05Z","abstract_excerpt":"Variational quantum algorithms are a promising hybrid framework for solving chemistry and physics problems with broad applicability to optimization as well. They are particularly well suited for noisy intermediate scale quantum (NISQ) computers. In this paper, we describe the unitary block optimization scheme (UBOS) and apply it to two variational quantum algorithms: the variational quantum eigensolver (VQE) and variational time evolution. The goal of VQE is to optimize a classically intractable parameterized quantum wave function to target a physical state of a Hamiltonian or solve an optimiz"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2102.08403","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/2102.08403/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":"2026-07-05T02:16:02Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Ai3GmgGV3xHVkT/JRmJiVhEcYQOWXW/EbSGh7ff+kgaZzXPgfwCdULuuUaxLxYk8sJlcnNAEqHBB0QgCQ5W8BA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-06T20:45:40.294613Z"},"content_sha256":"75de816a84df9c20e645c4c3bf0530f1e6e66216daff15a392b27b9f32b2cfb9","schema_version":"1.0","event_id":"sha256:75de816a84df9c20e645c4c3bf0530f1e6e66216daff15a392b27b9f32b2cfb9"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/4DAOTF4UPTXL355WAN7S246M53/bundle.json","state_url":"https://pith.science/pith/4DAOTF4UPTXL355WAN7S246M53/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/4DAOTF4UPTXL355WAN7S246M53/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":"2026-07-06T20:45:40Z","links":{"resolver":"https://pith.science/pith/4DAOTF4UPTXL355WAN7S246M53","bundle":"https://pith.science/pith/4DAOTF4UPTXL355WAN7S246M53/bundle.json","state":"https://pith.science/pith/4DAOTF4UPTXL355WAN7S246M53/state.json","well_known_bundle":"https://pith.science/.well-known/pith/4DAOTF4UPTXL355WAN7S246M53/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:4DAOTF4UPTXL355WAN7S246M53","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":"a740c43e308c43cc628c23b66a20f51798c15a52502e48c83ba6e54d04c4145e","cross_cats_sorted":["cond-mat.str-el"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2021-02-16T19:00:05Z","title_canon_sha256":"cbaef05d98bb77d83c2458893161006d05d0a78715586732b43b4bb840b55f38"},"schema_version":"1.0","source":{"id":"2102.08403","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2102.08403","created_at":"2026-07-05T02:16:02Z"},{"alias_kind":"arxiv_version","alias_value":"2102.08403v1","created_at":"2026-07-05T02:16:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2102.08403","created_at":"2026-07-05T02:16:02Z"},{"alias_kind":"pith_short_12","alias_value":"4DAOTF4UPTXL","created_at":"2026-07-05T02:16:02Z"},{"alias_kind":"pith_short_16","alias_value":"4DAOTF4UPTXL355W","created_at":"2026-07-05T02:16:02Z"},{"alias_kind":"pith_short_8","alias_value":"4DAOTF4U","created_at":"2026-07-05T02:16:02Z"}],"graph_snapshots":[{"event_id":"sha256:75de816a84df9c20e645c4c3bf0530f1e6e66216daff15a392b27b9f32b2cfb9","target":"graph","created_at":"2026-07-05T02:16:02Z","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/2102.08403/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Variational quantum algorithms are a promising hybrid framework for solving chemistry and physics problems with broad applicability to optimization as well. They are particularly well suited for noisy intermediate scale quantum (NISQ) computers. In this paper, we describe the unitary block optimization scheme (UBOS) and apply it to two variational quantum algorithms: the variational quantum eigensolver (VQE) and variational time evolution. The goal of VQE is to optimize a classically intractable parameterized quantum wave function to target a physical state of a Hamiltonian or solve an optimiz","authors_text":"Benjamin Villalonga, Bryan K. Clark, Lucas Slattery","cross_cats":["cond-mat.str-el"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2021-02-16T19:00:05Z","title":"Unitary Block Optimization for Variational Quantum Algorithms"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2102.08403","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":"sha256:882266bc54aac6142ff8f9404ff23326094b163c832257bacf00f266f2e8b38a","target":"record","created_at":"2026-07-05T02:16:02Z","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":"a740c43e308c43cc628c23b66a20f51798c15a52502e48c83ba6e54d04c4145e","cross_cats_sorted":["cond-mat.str-el"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2021-02-16T19:00:05Z","title_canon_sha256":"cbaef05d98bb77d83c2458893161006d05d0a78715586732b43b4bb840b55f38"},"schema_version":"1.0","source":{"id":"2102.08403","kind":"arxiv","version":1}},"canonical_sha256":"e0c0e997947ceebdf7b6037f2d73cceec0b05daf0e7d8663a92ea0fe04ad68b8","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e0c0e997947ceebdf7b6037f2d73cceec0b05daf0e7d8663a92ea0fe04ad68b8","first_computed_at":"2026-07-05T02:16:02.442794Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:16:02.442794Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Iz2sgjMGPkQp6fALsUejL0U7doxpW3bf7QDUwTA6zjlUUihuitjT9X/OZqL3t3KDQ9wMBcXBMYiJk4StYQTSAA==","signature_status":"signed_v1","signed_at":"2026-07-05T02:16:02.443249Z","signed_message":"canonical_sha256_bytes"},"source_id":"2102.08403","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:882266bc54aac6142ff8f9404ff23326094b163c832257bacf00f266f2e8b38a","sha256:75de816a84df9c20e645c4c3bf0530f1e6e66216daff15a392b27b9f32b2cfb9"],"state_sha256":"8c842437cd301c2eac971817a888e004440e9f68688a94561e70061536cfebc9"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NSYOoQSdRbtjYA1XdxiA72TAHEfDuHsFtjMHnTS6zBRVQA+1kasAjnXDnXilMUJpzXNzmmtuQjcsQy/cHVUIBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-06T20:45:40.296672Z","bundle_sha256":"eb1799c6fdb9039d7c7ea1b6c189c443eac34c361068dea03b9ccafb308e6cb1"}}