{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:URCKWUCVCU4RGMRHUETBDWSLG7","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":"3d495e81b55cb06d4a0ef0cb2062b90fa7a56f09b28840a4dbff28349e44b49e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2026-08-03T02:46:52Z","title_canon_sha256":"80082de85ea17b11d68f8e68aef0fbc096c12ca56689512d84b8c39382d772cd"},"schema_version":"1.0","source":{"id":"2608.01617","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2608.01617","created_at":"2026-08-04T02:06:08Z"},{"alias_kind":"arxiv_version","alias_value":"2608.01617v1","created_at":"2026-08-04T02:06:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2608.01617","created_at":"2026-08-04T02:06:08Z"},{"alias_kind":"pith_short_12","alias_value":"URCKWUCVCU4R","created_at":"2026-08-04T02:06:08Z"},{"alias_kind":"pith_short_16","alias_value":"URCKWUCVCU4RGMRH","created_at":"2026-08-04T02:06:08Z"},{"alias_kind":"pith_short_8","alias_value":"URCKWUCV","created_at":"2026-08-04T02:06:08Z"}],"graph_snapshots":[{"event_id":"sha256:195c85df6986a78e3213449d748682c2999d14fe49796da667861d7fabdbafbe","target":"graph","created_at":"2026-08-04T02:06:08Z","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/2608.01617/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Quantum metrology, which addresses parameter estimation in quantum systems, has broad applications across science and technology. Conventional metrology protocols for multi-qubit states in the multi-parameter regime typically require highly complex quantum measurements, leading to substantial quantum-resource costs. In this work, we introduce a family of metrology protocols that use only few-qubit measurements, thereby significantly reducing the required resources. For arbitrary pure states, one of our protocols approaches the quantum Cram\\'{e}r-Rao bound up to an overhead in sample complexity","authors_text":"Hsin-Yuan Huang, John Preskill, Liang Mao, Senrui Chen, Sisi Zhou","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2026-08-03T02:46:52Z","title":"Near-optimal quantum metrology with few-qubit measurements"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2608.01617","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":"sha256:228822c79f440a7bd1677a93ae3368971855e101a357df7bef0f501701b1acfd","target":"record","created_at":"2026-08-04T02:06:08Z","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":"3d495e81b55cb06d4a0ef0cb2062b90fa7a56f09b28840a4dbff28349e44b49e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2026-08-03T02:46:52Z","title_canon_sha256":"80082de85ea17b11d68f8e68aef0fbc096c12ca56689512d84b8c39382d772cd"},"schema_version":"1.0","source":{"id":"2608.01617","kind":"arxiv","version":1}},"canonical_sha256":"a444ab50551539133227a12611da4b37f6b6a54718533c05884bb604ad17c20a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a444ab50551539133227a12611da4b37f6b6a54718533c05884bb604ad17c20a","first_computed_at":"2026-08-04T02:06:08.253314Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-08-04T02:06:08.253314Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"msW7AO7A5zyOEl0m53rPsrGqBx/kqBMTmWFCLTgc/DlLLRwFv38RhbkUEZl3z8BrdJ2iHn/enljKMRj+Rn9CBA==","signature_status":"signed_v1","signed_at":"2026-08-04T02:06:08.254778Z","signed_message":"canonical_sha256_bytes"},"source_id":"2608.01617","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:228822c79f440a7bd1677a93ae3368971855e101a357df7bef0f501701b1acfd","sha256:195c85df6986a78e3213449d748682c2999d14fe49796da667861d7fabdbafbe"],"state_sha256":"5050a6895d3dc8515a39b9185513c60fa147ff56732421ad8a2a8110889895eb"}