{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:CQ7GMGEJDX3YZCQY4SLAUEV7TU","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":"b7865a0222f918dc31138e6e8cd9fae9da965c6d2f2174f32938b5cbf392d583","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2026-04-17T16:54:02Z","title_canon_sha256":"5fa7b63ca99064e06423d3c820154cce3bc38b32f52d6afdfc6b40256f256d81"},"schema_version":"1.0","source":{"id":"2604.16236","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2604.16236","created_at":"2026-05-20T02:05:43Z"},{"alias_kind":"arxiv_version","alias_value":"2604.16236v2","created_at":"2026-05-20T02:05:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2604.16236","created_at":"2026-05-20T02:05:43Z"},{"alias_kind":"pith_short_12","alias_value":"CQ7GMGEJDX3Y","created_at":"2026-05-20T02:05:43Z"},{"alias_kind":"pith_short_16","alias_value":"CQ7GMGEJDX3YZCQY","created_at":"2026-05-20T02:05:43Z"},{"alias_kind":"pith_short_8","alias_value":"CQ7GMGEJ","created_at":"2026-05-20T02:05:43Z"}],"graph_snapshots":[{"event_id":"sha256:7295f645fed9c1c64cc5ca125bb79f6ee5bb6e242d956cc61944b97f08dc37d1","target":"graph","created_at":"2026-05-20T02:05:43Z","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":4,"items":[{"attestation":"unclaimed","claim_id":"C1","kind":"strongest_claim","source":"verdict.strongest_claim","status":"machine_extracted","text":"Our results demonstrate excellent overall baseline resilience, with the system maintaining visibility above 97% and QBER below 1% on average."},{"attestation":"unclaimed","claim_id":"C2","kind":"weakest_assumption","source":"verdict.weakest_assumption","status":"machine_extracted","text":"The monitored periods and two specific fiber links are representative of typical operational conditions and that no undisclosed data filtering or post-selection affected the reported averages."},{"attestation":"unclaimed","claim_id":"C3","kind":"one_line_summary","source":"verdict.one_line_summary","status":"machine_extracted","text":"A commercial QKD device sustained visibility above 97% and QBER below 1% over extended operation on indoor and outdoor fibers in a tropical climate."},{"attestation":"unclaimed","claim_id":"C4","kind":"headline","source":"verdict.pith_extraction.headline","status":"machine_extracted","text":"A commercial QKD device maintains visibility above 97 percent and average QBER below 1 percent across months of continuous operation on Brazilian fiber links."}],"snapshot_sha256":"e79d6e1e3d8a714e79321f1e923d1750d82c2e6cb86cff92d4de52a5ae88288c"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2604.16236/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Quantum key distribution (QKD) has reached a commercially viable stage, with several companies offering hardware systems designed for operational deployment. Evaluating the performance of commercial QKD devices under real-world deployment conditions is essential for users seeking to understand the practical limitations and operational reliability of these systems. In this paper, we present a long-term performance analysis of ID Quantique's Clavis XGR deployed within the Hermes Quantum Network, in Brazil. Our study provides a detailed characterization of key operational metrics, such as secret ","authors_text":"Alisson Tezzin, Gustavo M. Uhdre, Oscar Martins, Sabrina Rufo, Vitor G.A. Carneiro","cross_cats":[],"headline":"A commercial QKD device maintains visibility above 97 percent and average QBER below 1 percent across months of continuous operation on Brazilian fiber links.","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2026-04-17T16:54:02Z","title":"Long-term Performance Analysis of a Commercial QKD Device Under Real-world Deployment Conditions"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2604.16236","kind":"arxiv","version":2},"verdict":{"created_at":"2026-05-10T08:43:45.256187Z","id":"fb423211-58b2-4505-bf4e-a6ada98aa3d3","model_set":{"reader":"grok-4.3"},"one_line_summary":"A commercial QKD device sustained visibility above 97% and QBER below 1% over extended operation on indoor and outdoor fibers in a tropical climate.","pipeline_version":"pith-pipeline@v0.9.0","pith_extraction_headline":"A commercial QKD device maintains visibility above 97 percent and average QBER below 1 percent across months of continuous operation on Brazilian fiber links.","strongest_claim":"Our results demonstrate excellent overall baseline resilience, with the system maintaining visibility above 97% and QBER below 1% on average.","weakest_assumption":"The monitored periods and two specific fiber links are representative of typical operational conditions and that no undisclosed data filtering or post-selection affected the reported averages."}},"verdict_id":"fb423211-58b2-4505-bf4e-a6ada98aa3d3"}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:86a1b48d87bcd6d9b51d2ef1c1a9a77e88e1b096721bc24fd467075256aa0f9a","target":"record","created_at":"2026-05-20T02:05:43Z","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":"b7865a0222f918dc31138e6e8cd9fae9da965c6d2f2174f32938b5cbf392d583","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2026-04-17T16:54:02Z","title_canon_sha256":"5fa7b63ca99064e06423d3c820154cce3bc38b32f52d6afdfc6b40256f256d81"},"schema_version":"1.0","source":{"id":"2604.16236","kind":"arxiv","version":2}},"canonical_sha256":"143e6618891df78c8a18e4960a12bf9d09a70c52aaaef7ff249c4741f9b7ff37","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"143e6618891df78c8a18e4960a12bf9d09a70c52aaaef7ff249c4741f9b7ff37","first_computed_at":"2026-05-20T02:05:43.283964Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-20T02:05:43.283964Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"t4bN/HGvCeG/y8Ju7pmFUHEQ+ZeaTzjrTDEv+NfkiLOQXiNVgmHlwFr5PlUzD2AuxHNWkkwDBzgceO34O03wBQ==","signature_status":"signed_v1","signed_at":"2026-05-20T02:05:43.285176Z","signed_message":"canonical_sha256_bytes"},"source_id":"2604.16236","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:86a1b48d87bcd6d9b51d2ef1c1a9a77e88e1b096721bc24fd467075256aa0f9a","sha256:7295f645fed9c1c64cc5ca125bb79f6ee5bb6e242d956cc61944b97f08dc37d1"],"state_sha256":"d13ec13998f9478749de70945043d5942aef637e42b3c4fabe421aa0f774c90b"}