{"paper":{"title":"Single Spatio-Temporal Mode Bright Twin-Beam Source Across the Near- and Mid-Infrared","license":"http://creativecommons.org/licenses/by/4.0/","headline":"A bright entangled twin-beam source maintains nearly single spatio-temporal mode operation from near- to mid-infrared while directing 95-97 percent of its entanglement resource into occupational degrees of freedom.","cross_cats":["physics.optics"],"primary_cat":"quant-ph","authors_text":"Amauri Perraton Elorza, Andrei Rasputnyi, Denis Seletskiy, Eli Martel, Esteban Murillo Zapata, Gabriel Demontigny, Maria Chekhova, Patrick Cusson, St\\'ephane Virally","submitted_at":"2026-05-14T20:15:37Z","abstract_excerpt":"We introduce an ultrafast, bright, entangled twin-beam source generated by type-0 parametric down-conversion in periodically-poled lithium niobate at MHz repetition rate, with continuously tunable Schmidt number $K$ set by the pump pulse duration. Photon-number statistics characterization via $g^{(2)}(0)$ and singular-value decomposition of the signal spectral density matrix yield $K\\simeq1.05$ and $K\\simeq1.03$, respectively, maintained over multiple orders of magnitude in brightness. Group-delay dispersion of the pump drives a continuous transition from single-mode operation to a controlled "},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"In the bright few-mode limit, the total entanglement resource is clearly separated between modal and occupational degrees of freedom, and our source allocates up to 95-97% of that resource to the occupational sector.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"That the measured g^{(2)}(0) values and singular-value decomposition of the signal spectral density matrix accurately capture the true Schmidt number K without significant undetected modes, spatial filtering effects, or calibration errors in the non-degenerate setup.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"A tunable single spatio-temporal mode bright twin-beam source across near- and mid-infrared with high occupational entanglement allocation in the bright limit.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"A bright entangled twin-beam source maintains nearly single spatio-temporal mode operation from near- to mid-infrared while directing 95-97 percent of its entanglement resource into occupational degrees of freedom.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"486b9a5ffc63ff6d37fbdd5541d241afd2271c3e869d023e4d615b9e59429da4"},"source":{"id":"2605.15385","kind":"arxiv","version":1},"verdict":{"id":"23bd0b65-1eaa-4098-bc4f-767974344506","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-19T15:29:00.389417Z","strongest_claim":"In the bright few-mode limit, the total entanglement resource is clearly separated between modal and occupational degrees of freedom, and our source allocates up to 95-97% of that resource to the occupational sector.","one_line_summary":"A tunable single spatio-temporal mode bright twin-beam source across near- and mid-infrared with high occupational entanglement allocation in the bright limit.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"That the measured g^{(2)}(0) values and singular-value decomposition of the signal spectral density matrix accurately capture the true Schmidt number K without significant undetected modes, spatial filtering effects, or calibration errors in the non-degenerate setup.","pith_extraction_headline":"A bright entangled twin-beam source maintains nearly single spatio-temporal mode operation from near- to mid-infrared while directing 95-97 percent of its entanglement resource into occupational degrees of freedom."},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2605.15385/integrity.json","findings":[],"available":true,"detectors_run":[{"name":"doi_title_agreement","ran_at":"2026-05-19T16:01:18.040084Z","status":"completed","version":"1.0.0","findings_count":0},{"name":"citation_quote_validity","ran_at":"2026-05-19T15:51:00.510951Z","status":"completed","version":"0.1.0","findings_count":0},{"name":"doi_compliance","ran_at":"2026-05-19T15:40:38.983558Z","status":"completed","version":"1.0.0","findings_count":0},{"name":"claim_evidence","ran_at":"2026-05-19T14:21:54.174798Z","status":"completed","version":"1.0.0","findings_count":0},{"name":"ai_meta_artifact","ran_at":"2026-05-19T13:33:22.726998Z","status":"skipped","version":"1.0.0","findings_count":0}],"snapshot_sha256":"a40e86758447f875c8b67bdafd986253facbfbab45c7605feac3275bb8fb2878"},"references":{"count":55,"sample":[{"doi":"","year":1997,"title":"P . G. Kwiat, “Hyper-entangled states,” J. Mod. 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