{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:YU3MFBV3BPIHKZYYYKAPQWUSOK","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":"869b7e0df81ce3b1c86d1f727dfe2790b668a7396c0dc3ca7ba17e91435bb377","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2018-09-04T14:12:47Z","title_canon_sha256":"ddfdaf4e0874e76c9bbf01f194d6b90b7c75cb6e22b0c5a25208a999817e6223"},"schema_version":"1.0","source":{"id":"1809.01007","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1809.01007","created_at":"2026-05-17T23:46:46Z"},{"alias_kind":"arxiv_version","alias_value":"1809.01007v1","created_at":"2026-05-17T23:46:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1809.01007","created_at":"2026-05-17T23:46:46Z"},{"alias_kind":"pith_short_12","alias_value":"YU3MFBV3BPIH","created_at":"2026-05-18T12:33:04Z"},{"alias_kind":"pith_short_16","alias_value":"YU3MFBV3BPIHKZYY","created_at":"2026-05-18T12:33:04Z"},{"alias_kind":"pith_short_8","alias_value":"YU3MFBV3","created_at":"2026-05-18T12:33:04Z"}],"graph_snapshots":[{"event_id":"sha256:7c1855b5fad8c4f1522f3a2cc2bfce131376ad601a477028b18ade41f7fcbf7e","target":"graph","created_at":"2026-05-17T23:46:46Z","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":"Quantum mechanics imposes a limit on the precision of a continuous position measurement of a harmonic oscillator, as a result of quantum backaction arising from quantum fluctuations in the measurement field. A variety of techniques to surpass this standard quantum limit have been proposed, such as variational measurements, stroboscopic quantum non-demolition and two tone backaction-evading (BAE) measurements. The latter proceed by monitoring only one of the two non-commuting quadratures of the motion. This technique, originally proposed in the context of gravitational wave detection, has not b","authors_text":"Andreas Nunnenkamp, Daniel Malz, Itay Shomroni, Liu Qiu, Tobias J. Kippenberg","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2018-09-04T14:12:47Z","title":"Optical Backaction-Evading Measurement of a Mechanical Oscillator"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1809.01007","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":"sha256:7093ee34f440684ae6959c93d8c57a08b1a127a20b43bc87a2614f760e37fbfd","target":"record","created_at":"2026-05-17T23:46:46Z","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":"869b7e0df81ce3b1c86d1f727dfe2790b668a7396c0dc3ca7ba17e91435bb377","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2018-09-04T14:12:47Z","title_canon_sha256":"ddfdaf4e0874e76c9bbf01f194d6b90b7c75cb6e22b0c5a25208a999817e6223"},"schema_version":"1.0","source":{"id":"1809.01007","kind":"arxiv","version":1}},"canonical_sha256":"c536c286bb0bd0756718c280f85a92728270ce192e696b043ae884373c49c97b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c536c286bb0bd0756718c280f85a92728270ce192e696b043ae884373c49c97b","first_computed_at":"2026-05-17T23:46:46.201683Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:46:46.201683Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"q19uEtYRAHK9uaJoEUpSS7stXn4LcWDgUDH1rStNYygSJgnDtAwbbdPuwvJXc0b2CFltz8/ia5I5/qYmAZMEDw==","signature_status":"signed_v1","signed_at":"2026-05-17T23:46:46.202188Z","signed_message":"canonical_sha256_bytes"},"source_id":"1809.01007","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7093ee34f440684ae6959c93d8c57a08b1a127a20b43bc87a2614f760e37fbfd","sha256:7c1855b5fad8c4f1522f3a2cc2bfce131376ad601a477028b18ade41f7fcbf7e"],"state_sha256":"7bc096e9800fd28744d3340c0c4ace0866bad054245aa7c5103d566864fbf73b"}