{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2010:SQAQQXT2APYZDXRPVWC363UHQA","short_pith_number":"pith:SQAQQXT2","schema_version":"1.0","canonical_sha256":"9401085e7a03f191de2fad85bf6e87801e2c4b4af321a40cb2617d964da8f6ac","source":{"kind":"arxiv","id":"1007.3825","version":1},"attestation_state":"computed","paper":{"title":"Stationary entanglement in N-atom subradiant degenerate cascade systems","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Massimo Borrelli, Matteo G. A. Paris, Nicola Piovella","submitted_at":"2010-07-22T08:32:38Z","abstract_excerpt":"We address ultracold $N$-atom degenerate cascade systems and show that stationary subradiant states, already observed in the semiclassical regime, also exist in a fully quantum regime and for a small number of atoms. We explicitly evaluate the amount of stationary entanglement for the two-atom configuration and show full inseparability for the three-atom case. We also show that a continuous variable description of the systems is not suitable to detect entanglement due to the nonGaussianity of subradiant states."},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1007.3825","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2010-07-22T08:32:38Z","cross_cats_sorted":[],"title_canon_sha256":"31cb42986dd6d74b940f63f9e6c6bc3d8dff4daa939a66d661f493f279d76848","abstract_canon_sha256":"4926eeef5b5cf698e6125a3da72f59e5a7a0e1ffb630d4c24156ca3b241483dd"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:15:06.703062Z","signature_b64":"ojl2w5MyTJCsesjTwWQubruWDUH2eKNMyNBkcWVY0E1D315kjGueMBxLwMFFey4t9PhlTRZCAIdmm61qI+xHAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"9401085e7a03f191de2fad85bf6e87801e2c4b4af321a40cb2617d964da8f6ac","last_reissued_at":"2026-05-18T04:15:06.702336Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:15:06.702336Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Stationary entanglement in N-atom subradiant degenerate cascade systems","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Massimo Borrelli, Matteo G. A. Paris, Nicola Piovella","submitted_at":"2010-07-22T08:32:38Z","abstract_excerpt":"We address ultracold $N$-atom degenerate cascade systems and show that stationary subradiant states, already observed in the semiclassical regime, also exist in a fully quantum regime and for a small number of atoms. We explicitly evaluate the amount of stationary entanglement for the two-atom configuration and show full inseparability for the three-atom case. We also show that a continuous variable description of the systems is not suitable to detect entanglement due to the nonGaussianity of subradiant states."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1007.3825","kind":"arxiv","version":1},"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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1007.3825","created_at":"2026-05-18T04:15:06.702474+00:00"},{"alias_kind":"arxiv_version","alias_value":"1007.3825v1","created_at":"2026-05-18T04:15:06.702474+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1007.3825","created_at":"2026-05-18T04:15:06.702474+00:00"},{"alias_kind":"pith_short_12","alias_value":"SQAQQXT2APYZ","created_at":"2026-05-18T12:26:13.927090+00:00"},{"alias_kind":"pith_short_16","alias_value":"SQAQQXT2APYZDXRP","created_at":"2026-05-18T12:26:13.927090+00:00"},{"alias_kind":"pith_short_8","alias_value":"SQAQQXT2","created_at":"2026-05-18T12:26:13.927090+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/SQAQQXT2APYZDXRPVWC363UHQA","json":"https://pith.science/pith/SQAQQXT2APYZDXRPVWC363UHQA.json","graph_json":"https://pith.science/api/pith-number/SQAQQXT2APYZDXRPVWC363UHQA/graph.json","events_json":"https://pith.science/api/pith-number/SQAQQXT2APYZDXRPVWC363UHQA/events.json","paper":"https://pith.science/paper/SQAQQXT2"},"agent_actions":{"view_html":"https://pith.science/pith/SQAQQXT2APYZDXRPVWC363UHQA","download_json":"https://pith.science/pith/SQAQQXT2APYZDXRPVWC363UHQA.json","view_paper":"https://pith.science/paper/SQAQQXT2","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1007.3825&json=true","fetch_graph":"https://pith.science/api/pith-number/SQAQQXT2APYZDXRPVWC363UHQA/graph.json","fetch_events":"https://pith.science/api/pith-number/SQAQQXT2APYZDXRPVWC363UHQA/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/SQAQQXT2APYZDXRPVWC363UHQA/action/timestamp_anchor","attest_storage":"https://pith.science/pith/SQAQQXT2APYZDXRPVWC363UHQA/action/storage_attestation","attest_author":"https://pith.science/pith/SQAQQXT2APYZDXRPVWC363UHQA/action/author_attestation","sign_citation":"https://pith.science/pith/SQAQQXT2APYZDXRPVWC363UHQA/action/citation_signature","submit_replication":"https://pith.science/pith/SQAQQXT2APYZDXRPVWC363UHQA/action/replication_record"}},"created_at":"2026-05-18T04:15:06.702474+00:00","updated_at":"2026-05-18T04:15:06.702474+00:00"}