{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2023:E6RQ3LZWVFPIDUEVPYTBJYL4MP","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":"ae2ed85f91244da6ae2e6b2283d1202b18da5759093ae30c4265e47cf722f5d2","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2023-10-09T20:41:53Z","title_canon_sha256":"22b7efeb06fb1a29c3beedc866ab8f13fa15c7751a76fb6233f7d216b2663ba7"},"schema_version":"1.0","source":{"id":"2310.06142","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2310.06142","created_at":"2026-07-05T07:50:52Z"},{"alias_kind":"arxiv_version","alias_value":"2310.06142v2","created_at":"2026-07-05T07:50:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2310.06142","created_at":"2026-07-05T07:50:52Z"},{"alias_kind":"pith_short_12","alias_value":"E6RQ3LZWVFPI","created_at":"2026-07-05T07:50:52Z"},{"alias_kind":"pith_short_16","alias_value":"E6RQ3LZWVFPIDUEV","created_at":"2026-07-05T07:50:52Z"},{"alias_kind":"pith_short_8","alias_value":"E6RQ3LZW","created_at":"2026-07-05T07:50:52Z"}],"graph_snapshots":[{"event_id":"sha256:b30b0cf32b2b85f24019a79fd959c54eb082d0e2f9d7636edb191497e5c2d017","target":"graph","created_at":"2026-07-05T07:50:52Z","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/2310.06142/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Quantum estimation of parameters defining open-system dynamics may be enhanced by using ancillas that are entangled with the probe but are not submitted to the dynamics. Here we consider the important problem of estimation of transmission of light by a sample, with losses due to absorption and scattering. We show, through the determination of the quantum Fisher information, that the ancilla strategy leads to the best possible precision in single-mode estimation, the one obtained for a Fock state input, through joint photon-counting of probe and ancilla, which are modes of a bimodal squeezed st","authors_text":"Girish S. Agarwal, Jiaxuan Wang, Luiz Davidovich, Ruynet. L. de Matos Filho","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2023-10-09T20:41:53Z","title":"Quantum advantage of time-reversed ancilla-based metrology of absorption parameters"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2310.06142","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:f3d023083fdec2c9192a13018d962c16ca5f85de36c1296d14355e1a73bb6c06","target":"record","created_at":"2026-07-05T07:50:52Z","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":"ae2ed85f91244da6ae2e6b2283d1202b18da5759093ae30c4265e47cf722f5d2","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2023-10-09T20:41:53Z","title_canon_sha256":"22b7efeb06fb1a29c3beedc866ab8f13fa15c7751a76fb6233f7d216b2663ba7"},"schema_version":"1.0","source":{"id":"2310.06142","kind":"arxiv","version":2}},"canonical_sha256":"27a30daf36a95e81d0957e2614e17c63dc8ac6b1680850f54b94dfc2a06e4bc9","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"27a30daf36a95e81d0957e2614e17c63dc8ac6b1680850f54b94dfc2a06e4bc9","first_computed_at":"2026-07-05T07:50:52.891912Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T07:50:52.891912Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"aWGs0f2aJBJ2ose5SOOKDm3aMqkidJkdEJHLVW1KZbISTSdeKk/Qmbtn4549Zjvo/vDX2jMYu7/xN2YcPc1BCw==","signature_status":"signed_v1","signed_at":"2026-07-05T07:50:52.892386Z","signed_message":"canonical_sha256_bytes"},"source_id":"2310.06142","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f3d023083fdec2c9192a13018d962c16ca5f85de36c1296d14355e1a73bb6c06","sha256:b30b0cf32b2b85f24019a79fd959c54eb082d0e2f9d7636edb191497e5c2d017"],"state_sha256":"d48f2e08420388bf102048f4ffad23e52baa6ee9adc4af03eba6fcd54af4f39d"}