{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2012:F7U6CHABTKOXE6XB6YJCGNYZJ3","short_pith_number":"pith:F7U6CHAB","schema_version":"1.0","canonical_sha256":"2fe9e11c019a9d727ae1f6122337194ef702f559b81283ebb195bcae1a2623b3","source":{"kind":"arxiv","id":"1208.4971","version":3},"attestation_state":"computed","paper":{"title":"An all-fiber source of pulsed twin beams at telecom band for quantum communication","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.optics"],"primary_cat":"quant-ph","authors_text":"Lei Yang, Nannan Liu, Xiaoying Li, Xueshi Guo, Z. Y. Ou","submitted_at":"2012-08-24T13:26:07Z","abstract_excerpt":"Motivated by the pursuit of a simple system to produce non-classical light sources for long- distance quantum communication, we generate for the first time an all-fiber source of pulsed twin beams in 1550 nm band by using a high gain fiber optical parametric amplifier. The noise of intensity difference of the twin beams is below the shot noise limit by 3.1 dB (10.4 dB after correction for losses). A detailed study reveals a number of limiting factors for higher noise reduction. Therefore, further noise reduction will be feasible once care is taken for these limiting factors."},"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":"1208.4971","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2012-08-24T13:26:07Z","cross_cats_sorted":["physics.optics"],"title_canon_sha256":"82efe056bd302a91b7707d2944ba04687a181cd4e9c17eefc6425f1beb376ec9","abstract_canon_sha256":"76475956bbb344c80fdf349e366e049d04c72401e6d8fb998fb9a6ca7f5be79d"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:37:40.954148Z","signature_b64":"eecJMxZuoroW9O5Y90UHg/KOVSK51x4th0v8eiYSfPbKyg1tMtQvjx1NrqFnMEKd99kEO5b6rJY+TYcUnchrCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2fe9e11c019a9d727ae1f6122337194ef702f559b81283ebb195bcae1a2623b3","last_reissued_at":"2026-05-18T03:37:40.953515Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:37:40.953515Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"An all-fiber source of pulsed twin beams at telecom band for quantum communication","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.optics"],"primary_cat":"quant-ph","authors_text":"Lei Yang, Nannan Liu, Xiaoying Li, Xueshi Guo, Z. Y. Ou","submitted_at":"2012-08-24T13:26:07Z","abstract_excerpt":"Motivated by the pursuit of a simple system to produce non-classical light sources for long- distance quantum communication, we generate for the first time an all-fiber source of pulsed twin beams in 1550 nm band by using a high gain fiber optical parametric amplifier. The noise of intensity difference of the twin beams is below the shot noise limit by 3.1 dB (10.4 dB after correction for losses). A detailed study reveals a number of limiting factors for higher noise reduction. Therefore, further noise reduction will be feasible once care is taken for these limiting factors."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1208.4971","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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1208.4971","created_at":"2026-05-18T03:37:40.953584+00:00"},{"alias_kind":"arxiv_version","alias_value":"1208.4971v3","created_at":"2026-05-18T03:37:40.953584+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1208.4971","created_at":"2026-05-18T03:37:40.953584+00:00"},{"alias_kind":"pith_short_12","alias_value":"F7U6CHABTKOX","created_at":"2026-05-18T12:27:04.183437+00:00"},{"alias_kind":"pith_short_16","alias_value":"F7U6CHABTKOXE6XB","created_at":"2026-05-18T12:27:04.183437+00:00"},{"alias_kind":"pith_short_8","alias_value":"F7U6CHAB","created_at":"2026-05-18T12:27:04.183437+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/F7U6CHABTKOXE6XB6YJCGNYZJ3","json":"https://pith.science/pith/F7U6CHABTKOXE6XB6YJCGNYZJ3.json","graph_json":"https://pith.science/api/pith-number/F7U6CHABTKOXE6XB6YJCGNYZJ3/graph.json","events_json":"https://pith.science/api/pith-number/F7U6CHABTKOXE6XB6YJCGNYZJ3/events.json","paper":"https://pith.science/paper/F7U6CHAB"},"agent_actions":{"view_html":"https://pith.science/pith/F7U6CHABTKOXE6XB6YJCGNYZJ3","download_json":"https://pith.science/pith/F7U6CHABTKOXE6XB6YJCGNYZJ3.json","view_paper":"https://pith.science/paper/F7U6CHAB","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1208.4971&json=true","fetch_graph":"https://pith.science/api/pith-number/F7U6CHABTKOXE6XB6YJCGNYZJ3/graph.json","fetch_events":"https://pith.science/api/pith-number/F7U6CHABTKOXE6XB6YJCGNYZJ3/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/F7U6CHABTKOXE6XB6YJCGNYZJ3/action/timestamp_anchor","attest_storage":"https://pith.science/pith/F7U6CHABTKOXE6XB6YJCGNYZJ3/action/storage_attestation","attest_author":"https://pith.science/pith/F7U6CHABTKOXE6XB6YJCGNYZJ3/action/author_attestation","sign_citation":"https://pith.science/pith/F7U6CHABTKOXE6XB6YJCGNYZJ3/action/citation_signature","submit_replication":"https://pith.science/pith/F7U6CHABTKOXE6XB6YJCGNYZJ3/action/replication_record"}},"created_at":"2026-05-18T03:37:40.953584+00:00","updated_at":"2026-05-18T03:37:40.953584+00:00"}