{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:NA3GTARRLNWRQVS2JM426YZ6IR","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":"bef907b1d241b9007220f2a1554183c4848919e2a1585c485792bbd362a12815","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-02-08T13:43:38Z","title_canon_sha256":"ca703e9fed5dae9f20072bf578083e4a3c231fdae51512a3806043abdedceef2"},"schema_version":"1.0","source":{"id":"1502.02249","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1502.02249","created_at":"2026-05-18T01:19:06Z"},{"alias_kind":"arxiv_version","alias_value":"1502.02249v2","created_at":"2026-05-18T01:19:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1502.02249","created_at":"2026-05-18T01:19:06Z"},{"alias_kind":"pith_short_12","alias_value":"NA3GTARRLNWR","created_at":"2026-05-18T12:29:32Z"},{"alias_kind":"pith_short_16","alias_value":"NA3GTARRLNWRQVS2","created_at":"2026-05-18T12:29:32Z"},{"alias_kind":"pith_short_8","alias_value":"NA3GTARR","created_at":"2026-05-18T12:29:32Z"}],"graph_snapshots":[{"event_id":"sha256:230facc3ae4b014b46c3e8ba5342171ccc53284f626afea50772d325a99faf6b","target":"graph","created_at":"2026-05-18T01:19:06Z","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 propose an efficient four-intensity decoy-state BB84 protocol and derive concise security bounds for this protocol with the universally composable finite-key analysis method. Comparing with the efficient three-intensity protocol, we find that our efficient four-intensity protocol can increase the secret key rate by at least $30\\%$. Particularly, this increasing rate of secret key rate will be raised as the transmission distance increases. At a large transmission distance, our efficient four-intensity protocol can improve the performance of quantum key distribution profoundly.","authors_text":"Bao Yan, Haodong Jiang, Ming Gao, Weilong Wang, Zhi Ma","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-02-08T13:43:38Z","title":"Universally-composable finite-key analysis for efficient four-intensity decoy-state quantum key distribution"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1502.02249","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":"sha256:47aa18eebcbbfe319b15abc7edd245904e4d0a72a6231e002cf06e2dfeeacef3","target":"record","created_at":"2026-05-18T01:19:06Z","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":"bef907b1d241b9007220f2a1554183c4848919e2a1585c485792bbd362a12815","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-02-08T13:43:38Z","title_canon_sha256":"ca703e9fed5dae9f20072bf578083e4a3c231fdae51512a3806043abdedceef2"},"schema_version":"1.0","source":{"id":"1502.02249","kind":"arxiv","version":2}},"canonical_sha256":"68366982315b6d18565a4b39af633e446dba7ca06b331de9de58319461281e55","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"68366982315b6d18565a4b39af633e446dba7ca06b331de9de58319461281e55","first_computed_at":"2026-05-18T01:19:06.225985Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:19:06.225985Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"IujuKV8wza4vNpvRSXmVkFyPor3tI0cME4x2d5qdmDDc5EADQRUwNtpCbPlypUmYE77J3fQ2qopHdoRpHgxyCA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:19:06.226750Z","signed_message":"canonical_sha256_bytes"},"source_id":"1502.02249","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:47aa18eebcbbfe319b15abc7edd245904e4d0a72a6231e002cf06e2dfeeacef3","sha256:230facc3ae4b014b46c3e8ba5342171ccc53284f626afea50772d325a99faf6b"],"state_sha256":"98524c586c25aac3edce3739f1f1c61573fbe58198b776f98a4834f1f972f103"}