{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:BUDHULHX7GRYHRHYSHRC5OGKMI","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":"104dcda5af0a7ca9d3bbd70db7f0c4ea0fa66e3f42388e268e7314e881a27334","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2012-07-02T20:00:00Z","title_canon_sha256":"824cad2217f476cd607dc26e54e54952b7c11e6e63bbb2a4f7d92f09b3a24c05"},"schema_version":"1.0","source":{"id":"1207.0494","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1207.0494","created_at":"2026-05-18T01:34:55Z"},{"alias_kind":"arxiv_version","alias_value":"1207.0494v1","created_at":"2026-05-18T01:34:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1207.0494","created_at":"2026-05-18T01:34:55Z"},{"alias_kind":"pith_short_12","alias_value":"BUDHULHX7GRY","created_at":"2026-05-18T12:27:01Z"},{"alias_kind":"pith_short_16","alias_value":"BUDHULHX7GRYHRHY","created_at":"2026-05-18T12:27:01Z"},{"alias_kind":"pith_short_8","alias_value":"BUDHULHX","created_at":"2026-05-18T12:27:01Z"}],"graph_snapshots":[{"event_id":"sha256:6e92f12696e36637f929ca8aa02006b5d7411b1ec2dc0221445cca44145e4d0a","target":"graph","created_at":"2026-05-18T01:34:55Z","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":"In this letter, we show that for all the so-called path-symmetric states, the measurement of parity of photon number at the output of an optical interferometer achieves maximal phase sensitivity at the quantum Cramer-Rao bound. Such optimal phase sensitivity with parity is attained at a suitable bias phase, which can be determined a priori. Our scheme is applicable for local phase estimation.","authors_text":"Hwang Lee, Jonathan P. Dowling, Kaushik P. Seshadreesan, Sejong Kim","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2012-07-02T20:00:00Z","title":"Parity Measurement is Sufficient for Phase Estimation at the Quantum Cramer-Rao Bound for Path-Symmetric States"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1207.0494","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:a958d7ce20e1b6d243935928e6f91307fa1515c1bb312fee55afc1b89b2043aa","target":"record","created_at":"2026-05-18T01:34:55Z","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":"104dcda5af0a7ca9d3bbd70db7f0c4ea0fa66e3f42388e268e7314e881a27334","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2012-07-02T20:00:00Z","title_canon_sha256":"824cad2217f476cd607dc26e54e54952b7c11e6e63bbb2a4f7d92f09b3a24c05"},"schema_version":"1.0","source":{"id":"1207.0494","kind":"arxiv","version":1}},"canonical_sha256":"0d067a2cf7f9a383c4f891e22eb8ca622bdef8f0c95bb13145a0aecbb0cede46","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0d067a2cf7f9a383c4f891e22eb8ca622bdef8f0c95bb13145a0aecbb0cede46","first_computed_at":"2026-05-18T01:34:55.816474Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:34:55.816474Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"T1RQ6Ic5BOcDifIOze1LOemJ7x0WT9wsvxr4P70Tb/CzpWa6CIk19ph5h02pd4fijQP372oNrnN84RFlsssYBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:34:55.817139Z","signed_message":"canonical_sha256_bytes"},"source_id":"1207.0494","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a958d7ce20e1b6d243935928e6f91307fa1515c1bb312fee55afc1b89b2043aa","sha256:6e92f12696e36637f929ca8aa02006b5d7411b1ec2dc0221445cca44145e4d0a"],"state_sha256":"2def11118ef351508a9113ecc56ab782ecc868329a98b966c47e63a49587e22f"}