{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:3YXHHS4VOO5E6FAK6ZUU4XFKB3","short_pith_number":"pith:3YXHHS4V","canonical_record":{"source":{"id":"0906.0962","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-06-04T19:00:47Z","cross_cats_sorted":[],"title_canon_sha256":"e62392ae6ff72f10eff536f8cc5fbf1d6858061f755fed5cde309979320125ca","abstract_canon_sha256":"a43edf23277beca81a3a161869f89ba83bd141f4652339e69a4ba8caad3893f4"},"schema_version":"1.0"},"canonical_sha256":"de2e73cb9573ba4f140af6694e5caa0ecd485e50bf3d0daf974f29c617e35680","source":{"kind":"arxiv","id":"0906.0962","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0906.0962","created_at":"2026-05-18T04:37:34Z"},{"alias_kind":"arxiv_version","alias_value":"0906.0962v3","created_at":"2026-05-18T04:37:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0906.0962","created_at":"2026-05-18T04:37:34Z"},{"alias_kind":"pith_short_12","alias_value":"3YXHHS4VOO5E","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"3YXHHS4VOO5E6FAK","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"3YXHHS4V","created_at":"2026-05-18T12:25:58Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:3YXHHS4VOO5E6FAK6ZUU4XFKB3","target":"record","payload":{"canonical_record":{"source":{"id":"0906.0962","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-06-04T19:00:47Z","cross_cats_sorted":[],"title_canon_sha256":"e62392ae6ff72f10eff536f8cc5fbf1d6858061f755fed5cde309979320125ca","abstract_canon_sha256":"a43edf23277beca81a3a161869f89ba83bd141f4652339e69a4ba8caad3893f4"},"schema_version":"1.0"},"canonical_sha256":"de2e73cb9573ba4f140af6694e5caa0ecd485e50bf3d0daf974f29c617e35680","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:37:34.078053Z","signature_b64":"CI50lKfpQgrb1o7NUnW5pvMF+l81rx1Exzuf1MDERtEOOpogETPU4YBLkeUPRbbSth35CaTJszKJODG3yGjyAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"de2e73cb9573ba4f140af6694e5caa0ecd485e50bf3d0daf974f29c617e35680","last_reissued_at":"2026-05-18T04:37:34.077518Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:37:34.077518Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0906.0962","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":"2026-05-18T04:37:34Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"n3QJzQJZu/V/z+C3g3Ic1WdZZ/2LgKhv45+DPy9mUUguiL6oVWPO6Y6Wa1Kcu67cPItjntmPle3QfhGmPnvuCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T12:41:14.795809Z"},"content_sha256":"e3fa0f8ad527e59f19484d387f0913484a4e7d50b33910d405bf9ca423da0604","schema_version":"1.0","event_id":"sha256:e3fa0f8ad527e59f19484d387f0913484a4e7d50b33910d405bf9ca423da0604"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:3YXHHS4VOO5E6FAK6ZUU4XFKB3","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Quantum-limited metrology and Bose-Einstein condensates","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Alexandre B. Tacla, Anil Shaji, Animesh Datta, Carlton M. Caves, Matthew J. Davis, Sergio Boixo","submitted_at":"2009-06-04T19:00:47Z","abstract_excerpt":"We discuss a quantum-metrology protocol designed to estimate a physical parameter in a Bose-Einstein condensate of N atoms, and we show that the measurement uncertainty can decrease faster than 1/N. The 1/N scaling is usually thought to be the best possible in any measurement scheme. From the perspective of quantum information theory, we outline the main idea that leads to a measurement uncertainty that scales better than 1/N. We examine in detail some potential problems and challenges that arise in implementing such a measurement protocol using a Bose-Einstein condensate. We discuss how some "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0906.0962","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":"2026-05-18T04:37:34Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EW72HkCujRnE53PEKU4Po1w3AsCznkIG3KkZrZn/0RzVheYiBa9BfBXyKr9IDHVOBd2uL95D6rYqtK8jtzYEBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T12:41:14.796374Z"},"content_sha256":"be739a654e15e7053d5237f0a7458ad3a4a164ce802cc1fc98f8cd0802c2d8e5","schema_version":"1.0","event_id":"sha256:be739a654e15e7053d5237f0a7458ad3a4a164ce802cc1fc98f8cd0802c2d8e5"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/3YXHHS4VOO5E6FAK6ZUU4XFKB3/bundle.json","state_url":"https://pith.science/pith/3YXHHS4VOO5E6FAK6ZUU4XFKB3/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/3YXHHS4VOO5E6FAK6ZUU4XFKB3/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":"2026-05-27T12:41:14Z","links":{"resolver":"https://pith.science/pith/3YXHHS4VOO5E6FAK6ZUU4XFKB3","bundle":"https://pith.science/pith/3YXHHS4VOO5E6FAK6ZUU4XFKB3/bundle.json","state":"https://pith.science/pith/3YXHHS4VOO5E6FAK6ZUU4XFKB3/state.json","well_known_bundle":"https://pith.science/.well-known/pith/3YXHHS4VOO5E6FAK6ZUU4XFKB3/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:3YXHHS4VOO5E6FAK6ZUU4XFKB3","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":"a43edf23277beca81a3a161869f89ba83bd141f4652339e69a4ba8caad3893f4","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-06-04T19:00:47Z","title_canon_sha256":"e62392ae6ff72f10eff536f8cc5fbf1d6858061f755fed5cde309979320125ca"},"schema_version":"1.0","source":{"id":"0906.0962","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0906.0962","created_at":"2026-05-18T04:37:34Z"},{"alias_kind":"arxiv_version","alias_value":"0906.0962v3","created_at":"2026-05-18T04:37:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0906.0962","created_at":"2026-05-18T04:37:34Z"},{"alias_kind":"pith_short_12","alias_value":"3YXHHS4VOO5E","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"3YXHHS4VOO5E6FAK","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"3YXHHS4V","created_at":"2026-05-18T12:25:58Z"}],"graph_snapshots":[{"event_id":"sha256:be739a654e15e7053d5237f0a7458ad3a4a164ce802cc1fc98f8cd0802c2d8e5","target":"graph","created_at":"2026-05-18T04:37:34Z","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 discuss a quantum-metrology protocol designed to estimate a physical parameter in a Bose-Einstein condensate of N atoms, and we show that the measurement uncertainty can decrease faster than 1/N. The 1/N scaling is usually thought to be the best possible in any measurement scheme. From the perspective of quantum information theory, we outline the main idea that leads to a measurement uncertainty that scales better than 1/N. We examine in detail some potential problems and challenges that arise in implementing such a measurement protocol using a Bose-Einstein condensate. We discuss how some ","authors_text":"Alexandre B. Tacla, Anil Shaji, Animesh Datta, Carlton M. Caves, Matthew J. Davis, Sergio Boixo","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-06-04T19:00:47Z","title":"Quantum-limited metrology and Bose-Einstein condensates"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0906.0962","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:e3fa0f8ad527e59f19484d387f0913484a4e7d50b33910d405bf9ca423da0604","target":"record","created_at":"2026-05-18T04:37:34Z","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":"a43edf23277beca81a3a161869f89ba83bd141f4652339e69a4ba8caad3893f4","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-06-04T19:00:47Z","title_canon_sha256":"e62392ae6ff72f10eff536f8cc5fbf1d6858061f755fed5cde309979320125ca"},"schema_version":"1.0","source":{"id":"0906.0962","kind":"arxiv","version":3}},"canonical_sha256":"de2e73cb9573ba4f140af6694e5caa0ecd485e50bf3d0daf974f29c617e35680","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"de2e73cb9573ba4f140af6694e5caa0ecd485e50bf3d0daf974f29c617e35680","first_computed_at":"2026-05-18T04:37:34.077518Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:37:34.077518Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"CI50lKfpQgrb1o7NUnW5pvMF+l81rx1Exzuf1MDERtEOOpogETPU4YBLkeUPRbbSth35CaTJszKJODG3yGjyAA==","signature_status":"signed_v1","signed_at":"2026-05-18T04:37:34.078053Z","signed_message":"canonical_sha256_bytes"},"source_id":"0906.0962","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e3fa0f8ad527e59f19484d387f0913484a4e7d50b33910d405bf9ca423da0604","sha256:be739a654e15e7053d5237f0a7458ad3a4a164ce802cc1fc98f8cd0802c2d8e5"],"state_sha256":"ce42924677f39a8c5d2693f95d901c7f250c86a83def8604a924220124eb0a8e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lNbs4gBhsn9J4w7DR9N5a/6jRqV4f+Cey+cGFVjFp/SN+dZKR787Dv6w7XVMMl73hFxyiwfqyTvH1zDMBtAnCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T12:41:14.799024Z","bundle_sha256":"584dec96a2548c6ab83c53744e8fa9d653fb4a6f5c51d679dd6c5d8931bb1a12"}}