{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:DJXG6CINX3NIMNB3HIDHBSH6QJ","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":"da860c87b04e90e359650930285b882406ccd7c973db06e35fed132a8c448ff8","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-10-30T18:52:03Z","title_canon_sha256":"90212aa3c282910764f7543b338ff8354e3b9e0815ee9b2fbb0e16e5a0c035e6"},"schema_version":"1.0","source":{"id":"0910.5942","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0910.5942","created_at":"2026-05-18T03:23:57Z"},{"alias_kind":"arxiv_version","alias_value":"0910.5942v1","created_at":"2026-05-18T03:23:57Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0910.5942","created_at":"2026-05-18T03:23:57Z"},{"alias_kind":"pith_short_12","alias_value":"DJXG6CINX3NI","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_16","alias_value":"DJXG6CINX3NIMNB3","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_8","alias_value":"DJXG6CIN","created_at":"2026-05-18T12:25:59Z"}],"graph_snapshots":[{"event_id":"sha256:26ed67a970a0f28e7cfe366ab218443d68db8c8b2858a49464cbc34492da4952","target":"graph","created_at":"2026-05-18T03:23:57Z","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":"We study the sensitivity and resolution of phase measurement in a Mach-Zehnder interferometer with two-mode squeezed vacuum (<n> photons on average). We show that super-resolution and sub-Heisenberg sensitivity is obtained with parity detection. In particular, in our setup, dependence of the signal on the phase evolves <n> times faster than in traditional schemes, and uncertainty in the phase estimation is better than 1/<n>.","authors_text":"Aravind Chiruvelli, Gretchen M. Raterman, Hwang Lee, Jonathan P. Dowling, Petr M. Anisimov, Sean D. Huver, William N. Plick","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-10-30T18:52:03Z","title":"Quantum Metrology with Two-Mode Squeezed Vacuum: Parity Detection Beats the Heisenberg Limit"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0910.5942","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:f37e6c5076f5c29c9c593bcac0159fddc22f3a2b78f5126674d7b30b421971b8","target":"record","created_at":"2026-05-18T03:23:57Z","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":"da860c87b04e90e359650930285b882406ccd7c973db06e35fed132a8c448ff8","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-10-30T18:52:03Z","title_canon_sha256":"90212aa3c282910764f7543b338ff8354e3b9e0815ee9b2fbb0e16e5a0c035e6"},"schema_version":"1.0","source":{"id":"0910.5942","kind":"arxiv","version":1}},"canonical_sha256":"1a6e6f090dbeda86343b3a0670c8fe826086b8c0cd9edeacf939288e79d4ef27","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1a6e6f090dbeda86343b3a0670c8fe826086b8c0cd9edeacf939288e79d4ef27","first_computed_at":"2026-05-18T03:23:57.023776Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:23:57.023776Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"LawzNeQmYC45G/eHOrk8Lr1PKYfeo6TdGsCZg2Qb/DejPdINIcvzKh2q8E8ewnzV0HbSeQ8ZkOOePnFUPa+yDg==","signature_status":"signed_v1","signed_at":"2026-05-18T03:23:57.024443Z","signed_message":"canonical_sha256_bytes"},"source_id":"0910.5942","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f37e6c5076f5c29c9c593bcac0159fddc22f3a2b78f5126674d7b30b421971b8","sha256:26ed67a970a0f28e7cfe366ab218443d68db8c8b2858a49464cbc34492da4952"],"state_sha256":"8b39d69f5f7c1219bd80a7c140a013a247555e12747037e0e627a1ed1668f129"}