{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:FFAZMVRLK5IF4RSWKO4E5BF6O6","short_pith_number":"pith:FFAZMVRL","canonical_record":{"source":{"id":"2009.00815","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2020-09-02T04:39:45Z","cross_cats_sorted":[],"title_canon_sha256":"bbd2b84dc5f390736bd24c801b0b953e0caed7adfe78b06dd6a5f016ba40eeb3","abstract_canon_sha256":"ade4c357643c993436aadcd57f5aab7d2516e4336915804b9ef50732083328d2"},"schema_version":"1.0"},"canonical_sha256":"294196562b57505e465653b84e84be778b9e20b4f9e2f792c62baee79665221d","source":{"kind":"arxiv","id":"2009.00815","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2009.00815","created_at":"2026-07-05T02:13:48Z"},{"alias_kind":"arxiv_version","alias_value":"2009.00815v2","created_at":"2026-07-05T02:13:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2009.00815","created_at":"2026-07-05T02:13:48Z"},{"alias_kind":"pith_short_12","alias_value":"FFAZMVRLK5IF","created_at":"2026-07-05T02:13:48Z"},{"alias_kind":"pith_short_16","alias_value":"FFAZMVRLK5IF4RSW","created_at":"2026-07-05T02:13:48Z"},{"alias_kind":"pith_short_8","alias_value":"FFAZMVRL","created_at":"2026-07-05T02:13:48Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:FFAZMVRLK5IF4RSWKO4E5BF6O6","target":"record","payload":{"canonical_record":{"source":{"id":"2009.00815","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2020-09-02T04:39:45Z","cross_cats_sorted":[],"title_canon_sha256":"bbd2b84dc5f390736bd24c801b0b953e0caed7adfe78b06dd6a5f016ba40eeb3","abstract_canon_sha256":"ade4c357643c993436aadcd57f5aab7d2516e4336915804b9ef50732083328d2"},"schema_version":"1.0"},"canonical_sha256":"294196562b57505e465653b84e84be778b9e20b4f9e2f792c62baee79665221d","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:13:48.978758Z","signature_b64":"EH7qAWT5pXnrVFYqCWyu0DrR1KhaPFexec5I2lCNZ2+0/1NK3KI40tSlzx4kZKZQWiFCwr9WZjJAT9PfwF8LBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"294196562b57505e465653b84e84be778b9e20b4f9e2f792c62baee79665221d","last_reissued_at":"2026-07-05T02:13:48.978274Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:13:48.978274Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2009.00815","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":"2026-07-05T02:13:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"JJOspQTVz5P6akYsy9MzWthgDY7zPI8aTBG5aZJiPibgTCNh3NXMEGeuAbk1gxrPSPXbTPladmGwE40vpABaDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-11T02:15:50.554241Z"},"content_sha256":"394b334a870ab50cc6b77e4c8c0196c7fa055cd22fc155c5cd527ae3de11b6c9","schema_version":"1.0","event_id":"sha256:394b334a870ab50cc6b77e4c8c0196c7fa055cd22fc155c5cd527ae3de11b6c9"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:FFAZMVRLK5IF4RSWKO4E5BF6O6","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Maximal entropy approach for quantum state tomography","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Raphael D. Levine, Rishabh Gupta, Rongxin Xia, Sabre Kais","submitted_at":"2020-09-02T04:39:45Z","abstract_excerpt":"Quantum computation has been growing rapidly in both theory and experiments. In particular, quantum computing devices with a large number of qubits have been developed by IBM, Google, IonQ, and others. The current quantum computing devices are noisy intermediate-scale quantum $($NISQ$)$ devices, and so approaches to validate quantum processing on these quantum devices are needed. One of the most common ways of validation for an n-qubit quantum system is quantum tomography, which tries to reconstruct a quantum system's density matrix by a complete set of observables. However, the inherent noise"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2009.00815","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/2009.00815/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":"2026-07-05T02:13:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZP8/M0RSXbwAlpMIprwqwJ01tnfr/FnGrCgO9v/vJZma+zeQYuqBjMsaScWCgJxM+rjJLfdsK9ZqCKJvVzupDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-11T02:15:50.555025Z"},"content_sha256":"b78eb24ca448a28d41f6a75851080d172a461ab674769de89dc8ba17a61dbcf9","schema_version":"1.0","event_id":"sha256:b78eb24ca448a28d41f6a75851080d172a461ab674769de89dc8ba17a61dbcf9"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/FFAZMVRLK5IF4RSWKO4E5BF6O6/bundle.json","state_url":"https://pith.science/pith/FFAZMVRLK5IF4RSWKO4E5BF6O6/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/FFAZMVRLK5IF4RSWKO4E5BF6O6/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":"2026-08-11T02:15:50Z","links":{"resolver":"https://pith.science/pith/FFAZMVRLK5IF4RSWKO4E5BF6O6","bundle":"https://pith.science/pith/FFAZMVRLK5IF4RSWKO4E5BF6O6/bundle.json","state":"https://pith.science/pith/FFAZMVRLK5IF4RSWKO4E5BF6O6/state.json","well_known_bundle":"https://pith.science/.well-known/pith/FFAZMVRLK5IF4RSWKO4E5BF6O6/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:FFAZMVRLK5IF4RSWKO4E5BF6O6","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":"ade4c357643c993436aadcd57f5aab7d2516e4336915804b9ef50732083328d2","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2020-09-02T04:39:45Z","title_canon_sha256":"bbd2b84dc5f390736bd24c801b0b953e0caed7adfe78b06dd6a5f016ba40eeb3"},"schema_version":"1.0","source":{"id":"2009.00815","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2009.00815","created_at":"2026-07-05T02:13:48Z"},{"alias_kind":"arxiv_version","alias_value":"2009.00815v2","created_at":"2026-07-05T02:13:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2009.00815","created_at":"2026-07-05T02:13:48Z"},{"alias_kind":"pith_short_12","alias_value":"FFAZMVRLK5IF","created_at":"2026-07-05T02:13:48Z"},{"alias_kind":"pith_short_16","alias_value":"FFAZMVRLK5IF4RSW","created_at":"2026-07-05T02:13:48Z"},{"alias_kind":"pith_short_8","alias_value":"FFAZMVRL","created_at":"2026-07-05T02:13:48Z"}],"graph_snapshots":[{"event_id":"sha256:b78eb24ca448a28d41f6a75851080d172a461ab674769de89dc8ba17a61dbcf9","target":"graph","created_at":"2026-07-05T02:13:48Z","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/2009.00815/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Quantum computation has been growing rapidly in both theory and experiments. In particular, quantum computing devices with a large number of qubits have been developed by IBM, Google, IonQ, and others. The current quantum computing devices are noisy intermediate-scale quantum $($NISQ$)$ devices, and so approaches to validate quantum processing on these quantum devices are needed. One of the most common ways of validation for an n-qubit quantum system is quantum tomography, which tries to reconstruct a quantum system's density matrix by a complete set of observables. However, the inherent noise","authors_text":"Raphael D. Levine, Rishabh Gupta, Rongxin Xia, Sabre Kais","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2020-09-02T04:39:45Z","title":"Maximal entropy approach for quantum state tomography"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2009.00815","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":"sha256:394b334a870ab50cc6b77e4c8c0196c7fa055cd22fc155c5cd527ae3de11b6c9","target":"record","created_at":"2026-07-05T02:13:48Z","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":"ade4c357643c993436aadcd57f5aab7d2516e4336915804b9ef50732083328d2","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2020-09-02T04:39:45Z","title_canon_sha256":"bbd2b84dc5f390736bd24c801b0b953e0caed7adfe78b06dd6a5f016ba40eeb3"},"schema_version":"1.0","source":{"id":"2009.00815","kind":"arxiv","version":2}},"canonical_sha256":"294196562b57505e465653b84e84be778b9e20b4f9e2f792c62baee79665221d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"294196562b57505e465653b84e84be778b9e20b4f9e2f792c62baee79665221d","first_computed_at":"2026-07-05T02:13:48.978274Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:13:48.978274Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"EH7qAWT5pXnrVFYqCWyu0DrR1KhaPFexec5I2lCNZ2+0/1NK3KI40tSlzx4kZKZQWiFCwr9WZjJAT9PfwF8LBA==","signature_status":"signed_v1","signed_at":"2026-07-05T02:13:48.978758Z","signed_message":"canonical_sha256_bytes"},"source_id":"2009.00815","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:394b334a870ab50cc6b77e4c8c0196c7fa055cd22fc155c5cd527ae3de11b6c9","sha256:b78eb24ca448a28d41f6a75851080d172a461ab674769de89dc8ba17a61dbcf9"],"state_sha256":"319886f537f1840da7344560891f2fa7aaa2876464eb414c72315e7aa44bd7f3"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+MUR28MSXJWlD3RVfKj7KvLN4NVxd8wKiTRLnnLPDhvjO2mH6nG/y54nJBkz92tl14u+0HXtt9GUeOQkJX+uCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-11T02:15:50.560727Z","bundle_sha256":"ac66fed5e757f2f96af8937bc03eddd5c460224107f3074d9cec704a660a059d"}}