{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:NKCANVSKFTBZAO7OGY4EZ7SUIJ","short_pith_number":"pith:NKCANVSK","canonical_record":{"source":{"id":"1805.04116","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2018-05-10T18:00:11Z","cross_cats_sorted":["cond-mat.mes-hall","physics.ins-det","physics.optics"],"title_canon_sha256":"63b01ae033d15b35cc50842cd4d75cc5b1d5797ebfd4620a24ff78c31eb4e696","abstract_canon_sha256":"4a9041d3b5dc14ca1c40200eed0a6ff8c64689f76d7f083c5bbf86f7625c2445"},"schema_version":"1.0"},"canonical_sha256":"6a8406d64a2cc3903bee36384cfe54427dd9fc5a353a28322f23ea513e639988","source":{"kind":"arxiv","id":"1805.04116","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1805.04116","created_at":"2026-05-17T23:48:23Z"},{"alias_kind":"arxiv_version","alias_value":"1805.04116v3","created_at":"2026-05-17T23:48:23Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1805.04116","created_at":"2026-05-17T23:48:23Z"},{"alias_kind":"pith_short_12","alias_value":"NKCANVSKFTBZ","created_at":"2026-05-18T12:32:40Z"},{"alias_kind":"pith_short_16","alias_value":"NKCANVSKFTBZAO7O","created_at":"2026-05-18T12:32:40Z"},{"alias_kind":"pith_short_8","alias_value":"NKCANVSK","created_at":"2026-05-18T12:32:40Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:NKCANVSKFTBZAO7OGY4EZ7SUIJ","target":"record","payload":{"canonical_record":{"source":{"id":"1805.04116","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2018-05-10T18:00:11Z","cross_cats_sorted":["cond-mat.mes-hall","physics.ins-det","physics.optics"],"title_canon_sha256":"63b01ae033d15b35cc50842cd4d75cc5b1d5797ebfd4620a24ff78c31eb4e696","abstract_canon_sha256":"4a9041d3b5dc14ca1c40200eed0a6ff8c64689f76d7f083c5bbf86f7625c2445"},"schema_version":"1.0"},"canonical_sha256":"6a8406d64a2cc3903bee36384cfe54427dd9fc5a353a28322f23ea513e639988","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:48:23.884878Z","signature_b64":"0wJ4REuMw59rZvxm2JNd7P4NLhFJOuepr1C4oxaiqak99NNIw7piO2Q7gm1ZBjkjJY3fVjmmv5pmTroWkRU3CA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6a8406d64a2cc3903bee36384cfe54427dd9fc5a353a28322f23ea513e639988","last_reissued_at":"2026-05-17T23:48:23.884302Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:48:23.884302Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1805.04116","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:48:23Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"gVCGR0KQnQDR3loO40ou1L1wKFLc2woI+fYuCuiYGIuiNXm2vnzZLbiZr9nOX4dMyET3dM5/KG4ghKpKkEAFDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-23T10:03:58.787992Z"},"content_sha256":"9d99492de2e11408e969c55f46777b2d7e15905b9f45c00bf25fa30303a92867","schema_version":"1.0","event_id":"sha256:9d99492de2e11408e969c55f46777b2d7e15905b9f45c00bf25fa30303a92867"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:NKCANVSKFTBZAO7OGY4EZ7SUIJ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Towards superresolution surface metrology: Quantum estimation of angular and axial separations","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.mes-hall","physics.ins-det","physics.optics"],"primary_cat":"quant-ph","authors_text":"Carmine Napoli, Gerardo Adesso, Richard Leach, Samanta Piano, Tommaso Tufarelli","submitted_at":"2018-05-10T18:00:11Z","abstract_excerpt":"We investigate the localization of two incoherent point sources with arbitrary angular and axial separations in the paraxial approximation. By using quantum metrology techniques, we show that a simultaneous estimation of the two separations is achievable by a single quantum measurement, with a precision saturating the ultimate limit stemming from the quantum Cram\\'er-Rao bound. Such a precision is not degraded in the sub-wavelength regime, thus overcoming the traditional limitations of classical direct imaging derived from Rayleigh's criterion. Our results are qualitatively independent of the "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1805.04116","kind":"arxiv","version":3},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:48:23Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fLMHgudkZbMxKModp6Oif61TAGEjRfaaTe6qbZxQb/4KXL89CnJ/WEb547mm5DFpf2odYKvJY6S7HB1BWfKdDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-23T10:03:58.788769Z"},"content_sha256":"cb656c257edd9fd3fa8d2b5f799139e619920f431ec2c28a44c5d18140bed7f5","schema_version":"1.0","event_id":"sha256:cb656c257edd9fd3fa8d2b5f799139e619920f431ec2c28a44c5d18140bed7f5"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/NKCANVSKFTBZAO7OGY4EZ7SUIJ/bundle.json","state_url":"https://pith.science/pith/NKCANVSKFTBZAO7OGY4EZ7SUIJ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/NKCANVSKFTBZAO7OGY4EZ7SUIJ/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-05-23T10:03:58Z","links":{"resolver":"https://pith.science/pith/NKCANVSKFTBZAO7OGY4EZ7SUIJ","bundle":"https://pith.science/pith/NKCANVSKFTBZAO7OGY4EZ7SUIJ/bundle.json","state":"https://pith.science/pith/NKCANVSKFTBZAO7OGY4EZ7SUIJ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/NKCANVSKFTBZAO7OGY4EZ7SUIJ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:NKCANVSKFTBZAO7OGY4EZ7SUIJ","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":"4a9041d3b5dc14ca1c40200eed0a6ff8c64689f76d7f083c5bbf86f7625c2445","cross_cats_sorted":["cond-mat.mes-hall","physics.ins-det","physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2018-05-10T18:00:11Z","title_canon_sha256":"63b01ae033d15b35cc50842cd4d75cc5b1d5797ebfd4620a24ff78c31eb4e696"},"schema_version":"1.0","source":{"id":"1805.04116","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1805.04116","created_at":"2026-05-17T23:48:23Z"},{"alias_kind":"arxiv_version","alias_value":"1805.04116v3","created_at":"2026-05-17T23:48:23Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1805.04116","created_at":"2026-05-17T23:48:23Z"},{"alias_kind":"pith_short_12","alias_value":"NKCANVSKFTBZ","created_at":"2026-05-18T12:32:40Z"},{"alias_kind":"pith_short_16","alias_value":"NKCANVSKFTBZAO7O","created_at":"2026-05-18T12:32:40Z"},{"alias_kind":"pith_short_8","alias_value":"NKCANVSK","created_at":"2026-05-18T12:32:40Z"}],"graph_snapshots":[{"event_id":"sha256:cb656c257edd9fd3fa8d2b5f799139e619920f431ec2c28a44c5d18140bed7f5","target":"graph","created_at":"2026-05-17T23:48:23Z","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 investigate the localization of two incoherent point sources with arbitrary angular and axial separations in the paraxial approximation. By using quantum metrology techniques, we show that a simultaneous estimation of the two separations is achievable by a single quantum measurement, with a precision saturating the ultimate limit stemming from the quantum Cram\\'er-Rao bound. Such a precision is not degraded in the sub-wavelength regime, thus overcoming the traditional limitations of classical direct imaging derived from Rayleigh's criterion. Our results are qualitatively independent of the ","authors_text":"Carmine Napoli, Gerardo Adesso, Richard Leach, Samanta Piano, Tommaso Tufarelli","cross_cats":["cond-mat.mes-hall","physics.ins-det","physics.optics"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2018-05-10T18:00:11Z","title":"Towards superresolution surface metrology: Quantum estimation of angular and axial separations"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1805.04116","kind":"arxiv","version":3},"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":"sha256:9d99492de2e11408e969c55f46777b2d7e15905b9f45c00bf25fa30303a92867","target":"record","created_at":"2026-05-17T23:48:23Z","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":"4a9041d3b5dc14ca1c40200eed0a6ff8c64689f76d7f083c5bbf86f7625c2445","cross_cats_sorted":["cond-mat.mes-hall","physics.ins-det","physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2018-05-10T18:00:11Z","title_canon_sha256":"63b01ae033d15b35cc50842cd4d75cc5b1d5797ebfd4620a24ff78c31eb4e696"},"schema_version":"1.0","source":{"id":"1805.04116","kind":"arxiv","version":3}},"canonical_sha256":"6a8406d64a2cc3903bee36384cfe54427dd9fc5a353a28322f23ea513e639988","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6a8406d64a2cc3903bee36384cfe54427dd9fc5a353a28322f23ea513e639988","first_computed_at":"2026-05-17T23:48:23.884302Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:48:23.884302Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"0wJ4REuMw59rZvxm2JNd7P4NLhFJOuepr1C4oxaiqak99NNIw7piO2Q7gm1ZBjkjJY3fVjmmv5pmTroWkRU3CA==","signature_status":"signed_v1","signed_at":"2026-05-17T23:48:23.884878Z","signed_message":"canonical_sha256_bytes"},"source_id":"1805.04116","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9d99492de2e11408e969c55f46777b2d7e15905b9f45c00bf25fa30303a92867","sha256:cb656c257edd9fd3fa8d2b5f799139e619920f431ec2c28a44c5d18140bed7f5"],"state_sha256":"8f55692fca67f5617c2a8cf3993d44af9515788a9b3116271784c4505841fad8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dLFpyx/X+AGrh5/W+r5Tuen9fKgh9LbmigZlvwfYm8cTEMAHLCtH3mO+ulRGCgUkwBCAgaWdbZ7YLR07xcDjBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-23T10:03:58.793702Z","bundle_sha256":"a76b92ec79b9a74a112b30276e20846b6ab23472c3bdf01a77c42d2f4c9bf819"}}