{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:6A4J6FRRSBRK23FS4XLC5DLHYJ","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":"a0d26e5e924d9490f8ea45311c8ff9657b22742c885667e118fcc0888698e164","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2019-04-29T13:56:10Z","title_canon_sha256":"2a80437f4d8a8813ae069034af4efffb48710a0f6dcedfaf87767029103c0531"},"schema_version":"1.0","source":{"id":"1904.12716","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1904.12716","created_at":"2026-05-17T23:47:34Z"},{"alias_kind":"arxiv_version","alias_value":"1904.12716v1","created_at":"2026-05-17T23:47:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1904.12716","created_at":"2026-05-17T23:47:34Z"},{"alias_kind":"pith_short_12","alias_value":"6A4J6FRRSBRK","created_at":"2026-05-18T12:33:10Z"},{"alias_kind":"pith_short_16","alias_value":"6A4J6FRRSBRK23FS","created_at":"2026-05-18T12:33:10Z"},{"alias_kind":"pith_short_8","alias_value":"6A4J6FRR","created_at":"2026-05-18T12:33:10Z"}],"graph_snapshots":[{"event_id":"sha256:e4c68d12bd2c5668649a9d2cebc74bd0d7d8fa4c76c070fa2c170c784acd8854","target":"graph","created_at":"2026-05-17T23:47:34Z","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":"Multiparameter estimation is a general problem that aims at measuring unknown physical quantities, obtaining high precision in the process. In this context, the adoption of quantum resources promises a substantial boost in the achievable performances with respect to the classical case. However, several open problems remain to be addressed in the multiparameter scenario. A crucial requirement is the identification of suitable platforms to develop and experimentally test novel efficient methodologies that can be employed in this general framework. We report the experimental implementation of a r","authors_text":"Andrea Crespi, Emanuele Polino, Fabio Sciarrino, Giacomo Corrielli, Martina Riva, Mauro Valeri, Nicol\\`o Spagnolo, Raffaele Silvestri, Roberto Osellame","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2019-04-29T13:56:10Z","title":"Experimental multiphase estimation on a chip"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1904.12716","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":"sha256:519c420bcaf8e689b8ef0033964bbc12f87e51638a81a4b384cc7fb09ac4b96e","target":"record","created_at":"2026-05-17T23:47:34Z","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":"a0d26e5e924d9490f8ea45311c8ff9657b22742c885667e118fcc0888698e164","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2019-04-29T13:56:10Z","title_canon_sha256":"2a80437f4d8a8813ae069034af4efffb48710a0f6dcedfaf87767029103c0531"},"schema_version":"1.0","source":{"id":"1904.12716","kind":"arxiv","version":1}},"canonical_sha256":"f0389f16319062ad6cb2e5d62e8d67c27059c3b8828bef6cd0bfd93757fd7a17","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f0389f16319062ad6cb2e5d62e8d67c27059c3b8828bef6cd0bfd93757fd7a17","first_computed_at":"2026-05-17T23:47:34.297989Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:47:34.297989Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Xhk7gHj+TkDgTapvCZLo46AiJmAfeRl0ceF/D4wVJ+3d1ZcI339XmOfL6fUlQBPHq/0XmxiSogqARRMliVPlBg==","signature_status":"signed_v1","signed_at":"2026-05-17T23:47:34.298597Z","signed_message":"canonical_sha256_bytes"},"source_id":"1904.12716","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:519c420bcaf8e689b8ef0033964bbc12f87e51638a81a4b384cc7fb09ac4b96e","sha256:e4c68d12bd2c5668649a9d2cebc74bd0d7d8fa4c76c070fa2c170c784acd8854"],"state_sha256":"0525d64735fb1692a55b75a3e223736f0c41b7115f8338bdfeddb44192186d44"}