{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:PHWDBU7P55N7UNEXVZDSV6SCK7","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":"ca9791f87b1f7b942838ef7e0a14bf149f8c975e8c67950517325538773ae1b6","cross_cats_sorted":["quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2014-11-21T09:53:48Z","title_canon_sha256":"8d6e1cf19387b287b6c37cce9d40b8c0e5ca8d25996217bb99981e3cd05d0413"},"schema_version":"1.0","source":{"id":"1411.5812","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1411.5812","created_at":"2026-05-18T01:41:28Z"},{"alias_kind":"arxiv_version","alias_value":"1411.5812v2","created_at":"2026-05-18T01:41:28Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1411.5812","created_at":"2026-05-18T01:41:28Z"},{"alias_kind":"pith_short_12","alias_value":"PHWDBU7P55N7","created_at":"2026-05-18T12:28:43Z"},{"alias_kind":"pith_short_16","alias_value":"PHWDBU7P55N7UNEX","created_at":"2026-05-18T12:28:43Z"},{"alias_kind":"pith_short_8","alias_value":"PHWDBU7P","created_at":"2026-05-18T12:28:43Z"}],"graph_snapshots":[{"event_id":"sha256:2d2322c7a522c9d810ff43a9cb7c95b3765df32382bfb53b640c0edba968ec8c","target":"graph","created_at":"2026-05-18T01:41:28Z","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 experimentally demonstrate an atom number detector capable of simultaneous detection of two mesoscopic ensembles with single-atom resolution. Such a sensitivity is a prerequisite for quantum metrology at a precision approaching the Heisenberg limit. Our system is based on fluorescence detection of atoms in a novel hybrid trap in which a dipole barrier divides a magneto-optical trap into two separated wells. We introduce a noise model describing the various sources contributing to the measurement error and report a limit of up to 500 atoms for single-atom resolution in the atom number differ","authors_text":"David B. Hume, Ion Stroescu, Markus K. Oberthaler","cross_cats":["quant-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2014-11-21T09:53:48Z","title":"A double-well atom trap for fluorescence detection at the Heisenberg limit"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1411.5812","kind":"arxiv","version":2},"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:a0f16b4acc041b7d5bcafd721e059f71a0ced305641bf7ede31b736497e79b17","target":"record","created_at":"2026-05-18T01:41:28Z","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":"ca9791f87b1f7b942838ef7e0a14bf149f8c975e8c67950517325538773ae1b6","cross_cats_sorted":["quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2014-11-21T09:53:48Z","title_canon_sha256":"8d6e1cf19387b287b6c37cce9d40b8c0e5ca8d25996217bb99981e3cd05d0413"},"schema_version":"1.0","source":{"id":"1411.5812","kind":"arxiv","version":2}},"canonical_sha256":"79ec30d3efef5bfa3497ae472afa4257c90013fe0d655af6fce49737641674e1","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"79ec30d3efef5bfa3497ae472afa4257c90013fe0d655af6fce49737641674e1","first_computed_at":"2026-05-18T01:41:28.591453Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:41:28.591453Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"U7Qt0bx/jW7nrUwaCay8RrAcfBq8fFSZTgLJsrCB5aywSB6oiqQ1Uas5HfwIAfOGig22l8qmrczhdU/w6iBCCw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:41:28.592106Z","signed_message":"canonical_sha256_bytes"},"source_id":"1411.5812","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a0f16b4acc041b7d5bcafd721e059f71a0ced305641bf7ede31b736497e79b17","sha256:2d2322c7a522c9d810ff43a9cb7c95b3765df32382bfb53b640c0edba968ec8c"],"state_sha256":"a13440285613ca13dc933761ec87fe2f33bca2cac7fbc00bcfd6808d73bd4c27"}