{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:K4LLORPT2VJJ6Y2ZWJ7ZS7LAC6","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":"293594a80ff91e50e5bc20c982b6ea454e2fd303f8cfd1a6b197197ed6c4f818","cross_cats_sorted":["physics.atom-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2013-05-14T20:24:54Z","title_canon_sha256":"6fa9e4fb9c2956344bafb624db879be2b9f13a3666032f787349010d8f8fb084"},"schema_version":"1.0","source":{"id":"1305.3290","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1305.3290","created_at":"2026-05-18T02:42:13Z"},{"alias_kind":"arxiv_version","alias_value":"1305.3290v1","created_at":"2026-05-18T02:42:13Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1305.3290","created_at":"2026-05-18T02:42:13Z"},{"alias_kind":"pith_short_12","alias_value":"K4LLORPT2VJJ","created_at":"2026-05-18T12:27:49Z"},{"alias_kind":"pith_short_16","alias_value":"K4LLORPT2VJJ6Y2Z","created_at":"2026-05-18T12:27:49Z"},{"alias_kind":"pith_short_8","alias_value":"K4LLORPT","created_at":"2026-05-18T12:27:49Z"}],"graph_snapshots":[{"event_id":"sha256:a12ab2c135288f371020b6737fc3721a270a7c6adc7d470e5b615b217a994a39","target":"graph","created_at":"2026-05-18T02:42:13Z","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 describe a measurement-and-feedback technique to deterministically prepare low-entropy states of atomic spin ensembles. Using quantum non-demolition measurement and incoherent optical feedback, we drive arbitrary states in the spin-orientation space toward the origin of the spin space. We observe 12 dB of spin noise reduction, or a factor of 63 reduction in phase-space volume. We find optimal feedback conditions and show that multi-stage feedback is advantageous. An input-output calculation of quantum noise incorporating realistic quantum noise sources and experimental limitations agrees we","authors_text":"1, F. Martin Ciurana, G. Colangelo, M. Napolitano, M.W. Mitchell, N. Behbood, R. J. Sewell","cross_cats":["physics.atom-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2013-05-14T20:24:54Z","title":"Feedback-cooling of an atomic spin ensemble"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1305.3290","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":"sha256:93696810947c520eed6f0e0d52913191d753997917f912f3eb02bbc140139830","target":"record","created_at":"2026-05-18T02:42:13Z","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":"293594a80ff91e50e5bc20c982b6ea454e2fd303f8cfd1a6b197197ed6c4f818","cross_cats_sorted":["physics.atom-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2013-05-14T20:24:54Z","title_canon_sha256":"6fa9e4fb9c2956344bafb624db879be2b9f13a3666032f787349010d8f8fb084"},"schema_version":"1.0","source":{"id":"1305.3290","kind":"arxiv","version":1}},"canonical_sha256":"5716b745f3d5529f6359b27f997d6017aa4c52c3c953655c6549d62c94cbdb20","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5716b745f3d5529f6359b27f997d6017aa4c52c3c953655c6549d62c94cbdb20","first_computed_at":"2026-05-18T02:42:13.209202Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:42:13.209202Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"KpNG2qPIa/81/x1L8MT/1hFkhGjhYroSVmOYLF6TXU7iPRE+2Szxjk+EinpjSgg6YoWAcuANCdfHTIHHKOlMDg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:42:13.209757Z","signed_message":"canonical_sha256_bytes"},"source_id":"1305.3290","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:93696810947c520eed6f0e0d52913191d753997917f912f3eb02bbc140139830","sha256:a12ab2c135288f371020b6737fc3721a270a7c6adc7d470e5b615b217a994a39"],"state_sha256":"8aeed5689dc5b05b436fc5ee851ef520e0de8dfb6d37b966fd4e91f0174ae10b"}