{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:THZWYLV5U4PTWFFMYUPLMA6HIR","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":"dec53be5f6926b558ca4d2498753a88b91c8a16c94f16f2305ab773d43f1a1d3","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2012-08-24T17:34:57Z","title_canon_sha256":"76a03e4d414d5e3cb52026f2c6eb50257b59304c6bd148d0594a8d1591da1f5a"},"schema_version":"1.0","source":{"id":"1208.5015","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1208.5015","created_at":"2026-05-18T03:30:55Z"},{"alias_kind":"arxiv_version","alias_value":"1208.5015v2","created_at":"2026-05-18T03:30:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1208.5015","created_at":"2026-05-18T03:30:55Z"},{"alias_kind":"pith_short_12","alias_value":"THZWYLV5U4PT","created_at":"2026-05-18T12:27:23Z"},{"alias_kind":"pith_short_16","alias_value":"THZWYLV5U4PTWFFM","created_at":"2026-05-18T12:27:23Z"},{"alias_kind":"pith_short_8","alias_value":"THZWYLV5","created_at":"2026-05-18T12:27:23Z"}],"graph_snapshots":[{"event_id":"sha256:ab411b82ee4bf7810bdcb023f81153b27219d2c0d91e46601887aee5a30671a5","target":"graph","created_at":"2026-05-18T03:30:55Z","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":"The need to perform quantum state tomography on ever larger systems has spurred a search for methods that yield good estimates from incomplete data. We study the performance of compressed sensing (CS) and least squares (LS) estimators in a fast protocol based on continuous measurement on an ensemble of cesium atomic spins. Both efficiently reconstruct nearly pure states in the 16-dimensional ground manifold, reaching average fidelities FCS = 0.92 and FLS = 0.88 using similar amounts of incomplete data. Surprisingly, the main advantage of CS in our protocol is an increased robustness to experim","authors_text":"A. Smith, B. E. Anderson, C. A. Riofr\\'io, H. Sosa-Martinez, I. H. Deutsch, P. S. Jessen","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2012-08-24T17:34:57Z","title":"Quantum state tomography by continuous measurement and compressed sensing"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1208.5015","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":"sha256:464a5b452937ab85674de3f3b73110363f138938412f2538a5943e4d17944a45","target":"record","created_at":"2026-05-18T03:30:55Z","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":"dec53be5f6926b558ca4d2498753a88b91c8a16c94f16f2305ab773d43f1a1d3","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2012-08-24T17:34:57Z","title_canon_sha256":"76a03e4d414d5e3cb52026f2c6eb50257b59304c6bd148d0594a8d1591da1f5a"},"schema_version":"1.0","source":{"id":"1208.5015","kind":"arxiv","version":2}},"canonical_sha256":"99f36c2ebda71f3b14acc51eb603c74464296a3f223560e56a0a7c1164554c9d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"99f36c2ebda71f3b14acc51eb603c74464296a3f223560e56a0a7c1164554c9d","first_computed_at":"2026-05-18T03:30:55.404191Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:30:55.404191Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"0L4Nl5zAPOeAqh8pnDghZXCcfybvAsRGoCpzshpMoqAu1vQKILKJJCqwlE8Oh7o30Uc7hEM9XCqR4wAfBc8gDg==","signature_status":"signed_v1","signed_at":"2026-05-18T03:30:55.405006Z","signed_message":"canonical_sha256_bytes"},"source_id":"1208.5015","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:464a5b452937ab85674de3f3b73110363f138938412f2538a5943e4d17944a45","sha256:ab411b82ee4bf7810bdcb023f81153b27219d2c0d91e46601887aee5a30671a5"],"state_sha256":"038cb6f7525d25e3d5c54be58678ca45096f9a3be96e236b7c7460fc46c616d7"}