{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:IQC4AQOLHSOANDYQHL2A5XPX3I","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":"29770cf4eadcc0fb10f50938825d36a7b3236d4f7135f89c72bcd151034834f8","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2025-09-16T05:54:01Z","title_canon_sha256":"face2c81f370517efbf60006b00b9a59c5bdd960519ef2d4af97e28a9ce04a08"},"schema_version":"1.0","source":{"id":"2509.12703","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2509.12703","created_at":"2026-07-28T01:22:22Z"},{"alias_kind":"arxiv_version","alias_value":"2509.12703v2","created_at":"2026-07-28T01:22:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2509.12703","created_at":"2026-07-28T01:22:22Z"},{"alias_kind":"pith_short_12","alias_value":"IQC4AQOLHSOA","created_at":"2026-07-28T01:22:22Z"},{"alias_kind":"pith_short_16","alias_value":"IQC4AQOLHSOANDYQ","created_at":"2026-07-28T01:22:22Z"},{"alias_kind":"pith_short_8","alias_value":"IQC4AQOL","created_at":"2026-07-28T01:22:22Z"}],"graph_snapshots":[{"event_id":"sha256:a2569836a9bf9d00bc279917a6ba52674ff854175ef91bbb4fbcd9e72ba006eb","target":"graph","created_at":"2026-07-28T01:22:22Z","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/2509.12703/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Quantum state tomography (QST) is a central task in quantum information, and its efficiency is commonly characterized by sample complexity. Although collective measurements on multiple copies achieve optimal performance, they are difficult to implement on near-term devices, motivating the study of single-copy approaches. Here, we introduce a ancilla-free single-copy QST protocol based on logarithmic-depth local circuits on an $n$-qubit system. For rank-$r$ states in dimension $d=2^n$, our protocol achieves trace-norm error $\\epsilon$ using $\\mathcal{O}(dr^2\\log d/\\epsilon^2)$ copies, matching ","authors_text":"Dohun Kim, Gyungmin Cho","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2025-09-16T05:54:01Z","title":"Sample-optimal single-copy quantum state tomography via shallow depth measurements"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2509.12703","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":"sha256:5bac48eab6f8a6bf384ea8ea0a76fc94cee33bb4c04029e6acb6680dc2c80b6a","target":"record","created_at":"2026-07-28T01:22:22Z","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":"29770cf4eadcc0fb10f50938825d36a7b3236d4f7135f89c72bcd151034834f8","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2025-09-16T05:54:01Z","title_canon_sha256":"face2c81f370517efbf60006b00b9a59c5bdd960519ef2d4af97e28a9ce04a08"},"schema_version":"1.0","source":{"id":"2509.12703","kind":"arxiv","version":2}},"canonical_sha256":"4405c041cb3c9c068f103af40eddf7da2df3af9886dbfe1b5a41a3d6c516ad8b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4405c041cb3c9c068f103af40eddf7da2df3af9886dbfe1b5a41a3d6c516ad8b","first_computed_at":"2026-07-28T01:22:22.925994Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-28T01:22:22.925994Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"1KTXUV0M5E9wfEo7iB5WQe5iCXBsqomYD+fgCys84ipJKho+zWBLKxf7AFzkBHSz8I+G+BNHlb4CmSZ9CqYBBw==","signature_status":"signed_v1","signed_at":"2026-07-28T01:22:22.927071Z","signed_message":"canonical_sha256_bytes"},"source_id":"2509.12703","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5bac48eab6f8a6bf384ea8ea0a76fc94cee33bb4c04029e6acb6680dc2c80b6a","sha256:a2569836a9bf9d00bc279917a6ba52674ff854175ef91bbb4fbcd9e72ba006eb"],"state_sha256":"f64ea631c7ddfbb15fa8fdd205dc5196e8d93517d1bc8aebe5f9ee8df78f2ece"}