{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:PPITTHQWLHHD6SNFJVOVLEKLS5","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":"36780e88444e0a2de7c17783b58f3501e647bdd6020063a1c1dbe59832d06379","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2018-04-23T09:04:48Z","title_canon_sha256":"765c48ebd451202ada54e43b3a9a861b2d8c771deac883c6964c292ed421dd59"},"schema_version":"1.0","source":{"id":"1804.08296","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1804.08296","created_at":"2026-05-17T23:55:20Z"},{"alias_kind":"arxiv_version","alias_value":"1804.08296v2","created_at":"2026-05-17T23:55:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1804.08296","created_at":"2026-05-17T23:55:20Z"},{"alias_kind":"pith_short_12","alias_value":"PPITTHQWLHHD","created_at":"2026-05-18T12:32:46Z"},{"alias_kind":"pith_short_16","alias_value":"PPITTHQWLHHD6SNF","created_at":"2026-05-18T12:32:46Z"},{"alias_kind":"pith_short_8","alias_value":"PPITTHQW","created_at":"2026-05-18T12:32:46Z"}],"graph_snapshots":[{"event_id":"sha256:d325337ee2d8564ad95b80d23ddf18d6bc1cb997ce0f83e1d81b69af9e99226f","target":"graph","created_at":"2026-05-17T23:55:20Z","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":"Understanding the distribution of quantum entanglement over many parties is a fundamental challenge of quantum physics and is of practical relevance for several applications in the field of quantum information. Here we use methods from quantum metrology to microscopically characterize the entanglement structure of multimode continuous-variable states in all possible multi-partitions and in all reduced distributions. From experimentally measured covariance matrices of Gaussian states with 2, 3, and 4 photonic modes with controllable losses, we extract the metrological sensitivity as well as an ","authors_text":"Augusto Smerzi, Dongmei Han, Kunchi Peng, Manuel Gessner, Weidong Li, Xiaolong Su, Xiaowei Deng, Zhihong Ren, Zhongzhong Qin","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2018-04-23T09:04:48Z","title":"Characterizing the multipartite continuous-variable entanglement structure from squeezing coefficients and the Fisher information"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1804.08296","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:f1ee7e17398ff3b7dd9508c546b0008a6fe55f86d67d09e4213867bdf7f7aebf","target":"record","created_at":"2026-05-17T23:55:20Z","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":"36780e88444e0a2de7c17783b58f3501e647bdd6020063a1c1dbe59832d06379","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2018-04-23T09:04:48Z","title_canon_sha256":"765c48ebd451202ada54e43b3a9a861b2d8c771deac883c6964c292ed421dd59"},"schema_version":"1.0","source":{"id":"1804.08296","kind":"arxiv","version":2}},"canonical_sha256":"7bd1399e1659ce3f49a54d5d55914b97569c931721a7adb3ac557560f094ed8f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7bd1399e1659ce3f49a54d5d55914b97569c931721a7adb3ac557560f094ed8f","first_computed_at":"2026-05-17T23:55:20.925709Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:55:20.925709Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"/UY71S5MS4OMDmCZJnUA94y9r/zzWMVhUkTqSFyi3gra7JxxQm6srIXmSt8gwW/hrRelVbRZMgw6ilGTseDpCg==","signature_status":"signed_v1","signed_at":"2026-05-17T23:55:20.926282Z","signed_message":"canonical_sha256_bytes"},"source_id":"1804.08296","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f1ee7e17398ff3b7dd9508c546b0008a6fe55f86d67d09e4213867bdf7f7aebf","sha256:d325337ee2d8564ad95b80d23ddf18d6bc1cb997ce0f83e1d81b69af9e99226f"],"state_sha256":"689cfdd14044fad975273e0c3e4705d5ed36ab45b18ead38f5956e20f5d295ac"}