{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2024:RQHDCYMBAO4TXXVB3VLMVPXQSG","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":"90793b59b86c66ca4122d8f6e4ccc9ef3916ddbb33cb2dde7c90ad9e995a88f0","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2024-05-28T17:45:07Z","title_canon_sha256":"896dd24a27156014717b7b1060cf48163da99baa97c176cf4f6f23dae62ee38e"},"schema_version":"1.0","source":{"id":"2405.18404","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2405.18404","created_at":"2026-07-05T08:24:19Z"},{"alias_kind":"arxiv_version","alias_value":"2405.18404v1","created_at":"2026-07-05T08:24:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2405.18404","created_at":"2026-07-05T08:24:19Z"},{"alias_kind":"pith_short_12","alias_value":"RQHDCYMBAO4T","created_at":"2026-07-05T08:24:19Z"},{"alias_kind":"pith_short_16","alias_value":"RQHDCYMBAO4TXXVB","created_at":"2026-07-05T08:24:19Z"},{"alias_kind":"pith_short_8","alias_value":"RQHDCYMB","created_at":"2026-07-05T08:24:19Z"}],"graph_snapshots":[{"event_id":"sha256:9e656ffa6f2229bac5db26b7070b6b17a9fb7cb3221273018ea2b9ee4b639932","target":"graph","created_at":"2026-07-05T08:24:19Z","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/2405.18404/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We study the multiparameter sensitivity bounds of a sensor made by an array of $d$ spatially-distributed Mach-Zehnder interferometers (MZIs). A generic single non-classical state is mixed with $d-1$ vacuums to create a $d$-modes entangled state, each mode entering one input port of a MZI, while a coherent state enters its second port. We show that local measurements, independently performed on each MZI, are sufficient to provide a sensitivity saturating the quantum Cram\\'er-Rao bound. The sensor can overcome the shot noise limit for the estimation of arbitrary linear combinations of the $d$ ph","authors_text":"Augusto Smerzi, Luca Pezz\\`e","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2024-05-28T17:45:07Z","title":"Distributed quantum multiparameter estimation with optimal local measurements"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2405.18404","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:d1835160c93d224a16ede50e8edb1c4c73bea55fb00407486d5a6d6fdf2ddad2","target":"record","created_at":"2026-07-05T08:24:19Z","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":"90793b59b86c66ca4122d8f6e4ccc9ef3916ddbb33cb2dde7c90ad9e995a88f0","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2024-05-28T17:45:07Z","title_canon_sha256":"896dd24a27156014717b7b1060cf48163da99baa97c176cf4f6f23dae62ee38e"},"schema_version":"1.0","source":{"id":"2405.18404","kind":"arxiv","version":1}},"canonical_sha256":"8c0e31618103b93bdea1dd56cabef091a208e65b51c5b73aad939eac2f0d66e7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8c0e31618103b93bdea1dd56cabef091a208e65b51c5b73aad939eac2f0d66e7","first_computed_at":"2026-07-05T08:24:19.751468Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T08:24:19.751468Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"fDZgKC8eeMmqbse5nV4QuFtbyilyUFZXAoi8yXnP3XngdoSHwo6kYXenkhMgl5p7dQFF9Onn1f51THjt1ChBAw==","signature_status":"signed_v1","signed_at":"2026-07-05T08:24:19.751892Z","signed_message":"canonical_sha256_bytes"},"source_id":"2405.18404","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d1835160c93d224a16ede50e8edb1c4c73bea55fb00407486d5a6d6fdf2ddad2","sha256:9e656ffa6f2229bac5db26b7070b6b17a9fb7cb3221273018ea2b9ee4b639932"],"state_sha256":"c3e3b836fc64567ca16831c66ed89d4eeea3f32425b88b8537f9dae31a323a23"}