{"paper":{"title":"Multipartite Bell-GHZ nonclassicality from interwoven frustrated down-conversion","license":"http://creativecommons.org/licenses/by/4.0/","headline":"A multi-observer extension of interwoven frustrated parametric down-conversion violates a lifted Clauser-Horne Bell inequality through controllable interference of multi-pair emissions.","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Konrad Schlichtholz, Marcin Markiewicz, Marek \\.Zukowski, Pawe{\\l} Cie\\'sli\\'nski","submitted_at":"2026-02-20T17:41:45Z","abstract_excerpt":"We present a theory of an interference process that starts with N coherently pumped two-mode parametric down-conversion (PDC) sources, whose output modes are directed to N observers such that each observer receives modes from two different source crystals. Each observation station is equipped with a locally controlled PDC crystal, coherently pumped with the source crystals, whose output modes are perfectly aligned with the input modes from the source PDCs. By varying the local phases of the input modes, perfect 2N-photon interference can be observed in 2N single-photon registrations, one in ea"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"We extend this scheme to a multi-observer configuration and show that it violates a lifted Clauser-Horne Bell inequality in a scenario where the local PDC processes at the measurement stations implement on/off measurement settings.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The violation originates from interference between multi-pair emissions in the source crystals and in the local PDCs, which becomes observable only when the local pump powers are included as controllable parameters.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"A multi-observer configuration of interwoven frustrated down-conversion produces interference from multi-pair emissions that violates a lifted Clauser-Horne Bell inequality when local pump powers are treated as controllable parameters.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"A multi-observer extension of interwoven frustrated parametric down-conversion violates a lifted Clauser-Horne Bell inequality through controllable interference of multi-pair emissions.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"46a5b7118ad6489e08882922471290beff06d8e444e7443efbd7f674358a950f"},"source":{"id":"2602.18381","kind":"arxiv","version":3},"verdict":{"id":"af02e23b-c9fc-4f6f-9579-1f0009a4297a","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-15T20:18:39.423586Z","strongest_claim":"We extend this scheme to a multi-observer configuration and show that it violates a lifted Clauser-Horne Bell inequality in a scenario where the local PDC processes at the measurement stations implement on/off measurement settings.","one_line_summary":"A multi-observer configuration of interwoven frustrated down-conversion produces interference from multi-pair emissions that violates a lifted Clauser-Horne Bell inequality when local pump powers are treated as controllable parameters.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"The violation originates from interference between multi-pair emissions in the source crystals and in the local PDCs, which becomes observable only when the local pump powers are included as controllable parameters.","pith_extraction_headline":"A multi-observer extension of interwoven frustrated parametric down-conversion violates a lifted Clauser-Horne Bell inequality through controllable interference of multi-pair emissions."},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2602.18381/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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"}