{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:S6G72XYXR2OWKMXWI7FSSSG5NC","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":"a8e916a804341687a84404fd165dc0eaad40f1d617ead979c9a5c4c7486d8614","cross_cats_sorted":["physics.atom-ph"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2026-08-07T05:12:17Z","title_canon_sha256":"1d7c6aff6046659f4263d3b929e1d2fc32bb83268fd47d3fc35bac4586fe7257"},"schema_version":"1.0","source":{"id":"2608.06815","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2608.06815","created_at":"2026-08-10T01:12:10Z"},{"alias_kind":"arxiv_version","alias_value":"2608.06815v1","created_at":"2026-08-10T01:12:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2608.06815","created_at":"2026-08-10T01:12:10Z"},{"alias_kind":"pith_short_12","alias_value":"S6G72XYXR2OW","created_at":"2026-08-10T01:12:10Z"},{"alias_kind":"pith_short_16","alias_value":"S6G72XYXR2OWKMXW","created_at":"2026-08-10T01:12:10Z"},{"alias_kind":"pith_short_8","alias_value":"S6G72XYX","created_at":"2026-08-10T01:12:10Z"}],"graph_snapshots":[{"event_id":"sha256:3d37deeb3d9c187ff3bb3a1311a469c13d8456aaff2a3ee6f5c6f56d427e69c1","target":"graph","created_at":"2026-08-10T01:12:10Z","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/2608.06815/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Optical atomic magnetometry is a powerful tool for continuous sensing applications, yet, in the absence of quantum correlations, its sensitivity is limited by the standard quantum limit (SQL) stemming from a trade-off between optical probe imprecision and quantum measurement backaction. Beyond-SQL sensitivity requires quantum correlations that modify these measurement noise sources. Here we demonstrate such sensitivity by using entangled state of the probe light and by engineering correlations between measurement imprecision and backaction. Having first explored SQL in a broad range of frequen","authors_text":"Andrea Grimaldi, Emil Zeuthen, Eugene Simon Polzik, J\\\"org Helge M\\\"uller, Jun Jia, Laurits M{\\o}berg, Maimouna Bocoum, Mikhail Balabas, T\\'ulio Brito Brasil","cross_cats":["physics.atom-ph"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2026-08-07T05:12:17Z","title":"Entanglement-enhanced optical magnetometry beyond the standard quantum limit"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2608.06815","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":"sha256:471bca037ec67f1c76e1a57c41d306d7d5353a3316507af609de86023c2aa66c","target":"record","created_at":"2026-08-10T01:12:10Z","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":"a8e916a804341687a84404fd165dc0eaad40f1d617ead979c9a5c4c7486d8614","cross_cats_sorted":["physics.atom-ph"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2026-08-07T05:12:17Z","title_canon_sha256":"1d7c6aff6046659f4263d3b929e1d2fc32bb83268fd47d3fc35bac4586fe7257"},"schema_version":"1.0","source":{"id":"2608.06815","kind":"arxiv","version":1}},"canonical_sha256":"978dfd5f178e9d6532f647cb2948dd68b5f2ba6f76b1748f0c07d621c57c4ec2","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"978dfd5f178e9d6532f647cb2948dd68b5f2ba6f76b1748f0c07d621c57c4ec2","first_computed_at":"2026-08-10T01:12:10.709922Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-08-10T01:12:10.709922Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"+3OPZ6h76ir9xniKsPKw9j/orhM14K+3lZ3y+Mqk24N4D02kbE+ODv0pXddv6Q3ysAFba4R2XutIuLo5sBouCw==","signature_status":"signed_v1","signed_at":"2026-08-10T01:12:10.712339Z","signed_message":"canonical_sha256_bytes"},"source_id":"2608.06815","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:471bca037ec67f1c76e1a57c41d306d7d5353a3316507af609de86023c2aa66c","sha256:3d37deeb3d9c187ff3bb3a1311a469c13d8456aaff2a3ee6f5c6f56d427e69c1"],"state_sha256":"a615887b41ac354629cc039ea358d7c18f5d6c13e9f732e78335fa1b515ccc39"}