{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:CYSTMKZ7VTRLP3XBBOJY3MI5B6","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":"7cb33bfa81ee19a695a2229a4f8d6bd9371bf202a5283c526aa8bd2d21ef1ef7","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"quant-ph","submitted_at":"2014-09-22T13:31:46Z","title_canon_sha256":"f90a4f7323269a29bc6bb5014c8828c0456003ef8baf5b970553d2ff78151fc9"},"schema_version":"1.0","source":{"id":"1409.6167","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1409.6167","created_at":"2026-05-18T01:21:23Z"},{"alias_kind":"arxiv_version","alias_value":"1409.6167v2","created_at":"2026-05-18T01:21:23Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1409.6167","created_at":"2026-05-18T01:21:23Z"},{"alias_kind":"pith_short_12","alias_value":"CYSTMKZ7VTRL","created_at":"2026-05-18T12:28:25Z"},{"alias_kind":"pith_short_16","alias_value":"CYSTMKZ7VTRLP3XB","created_at":"2026-05-18T12:28:25Z"},{"alias_kind":"pith_short_8","alias_value":"CYSTMKZ7","created_at":"2026-05-18T12:28:25Z"}],"graph_snapshots":[{"event_id":"sha256:a9c638a84f7da742c430d067682f27abb45b7d40a4e0211046688211d8da0523","target":"graph","created_at":"2026-05-18T01:21:23Z","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":"We propose a generalized form of entangled coherent states (ECS) and apply them in a multi-arm optical interferometer to estimate multiple phase shifts. We obtain the quantum Cramer-Rao bounds for both the linear and nonlinear parameterization protocols. Through the analysis, we find that, utilizing the simultaneous estimation, this generalized form of ECS gives a better precision than the generalized NOON states [Phys. Rev. Lett. \\textbf{111}, 070403 (2013)]. Moreover, comparing with the independent estimation, both the linear and nonlinear protocols have the same advantage in the relation to","authors_text":"Jing Liu, Xiaoguang Wang, Xiao-Ming Lu, Zhe Sun","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"quant-ph","submitted_at":"2014-09-22T13:31:46Z","title":"Quantum multiparameter metrology with generalized entangled coherent state"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1409.6167","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":"sha256:981e34fad763bfc0cbcae6fbc0255548ba00cc423e0db3d19a20101bdd6b8340","target":"record","created_at":"2026-05-18T01:21:23Z","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":"7cb33bfa81ee19a695a2229a4f8d6bd9371bf202a5283c526aa8bd2d21ef1ef7","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"quant-ph","submitted_at":"2014-09-22T13:31:46Z","title_canon_sha256":"f90a4f7323269a29bc6bb5014c8828c0456003ef8baf5b970553d2ff78151fc9"},"schema_version":"1.0","source":{"id":"1409.6167","kind":"arxiv","version":2}},"canonical_sha256":"1625362b3face2b7eee10b938db11d0facd60ae061687e3bbae3b036f6091dc7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1625362b3face2b7eee10b938db11d0facd60ae061687e3bbae3b036f6091dc7","first_computed_at":"2026-05-18T01:21:23.211884Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:21:23.211884Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"vvLhcFQ/GXiMtfrPYU2tmsFGYkPdzv7Q7oSbhrm7pZErpN3qpwNRvdnRi3FVKxlTWF1srjoG4Egyv5UrQXwqAg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:21:23.212559Z","signed_message":"canonical_sha256_bytes"},"source_id":"1409.6167","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:981e34fad763bfc0cbcae6fbc0255548ba00cc423e0db3d19a20101bdd6b8340","sha256:a9c638a84f7da742c430d067682f27abb45b7d40a4e0211046688211d8da0523"],"state_sha256":"28e4b4fa7f963c0403f1e2dfdece29cb0c87f9ba104481071b4aa3191928497a"}