{"paper":{"title":"Reducing Postselection Overhead in Magic-State Cultivation by In-Patch Multiplexing","license":"http://creativecommons.org/licenses/by/4.0/","headline":"In-patch multiplexing reduces expected attempts in magic-state cultivation by creating multiple early opportunities inside one logical patch.","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Aniket Patra, Dongmin Kim, Jeonggeun Seo, Youngsun Han","submitted_at":"2026-05-05T10:42:57Z","abstract_excerpt":"Fault-tolerant quantum computing requires high-fidelity logical magic states for implementing non-Clifford operations. Magic-state cultivation provides a lower-overhead route to logical magic-state preparation, but its efficiency is limited by postselection loss during the early injection-and-cultivation stages. In this work, we propose an in-patch multiplexing scheme that uses early-stage idle resources within a single logical patch to create multiple local cultivation opportunities. A candidate that passes the early stages is forwarded to the standard escape pathway, while the escape stage a"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"Under a uniform depolarizing noise model with idle noise, the proposed protocol substantially reduces the injection-and-cultivation discard rate and the expected number of attempts required to obtain an accepted early-stage candidate. At a physical error rate of p=2×10^{-3}, the injection-and-cultivation expected attempts are reduced by 45.46% for d1=3 and by 72.91% for d1=5, relative to the single-site MSC baseline. In the direct full-cycle evaluation including escape, the expected attempts per kept logical output are further reduced by 49.04% for d1=3 and by 78.69% for d1=5.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The escape stage and the decoder-based acceptance procedure can be kept identical to the single-site baseline without introducing new error sources or changing the logical-error behavior, and the uniform depolarizing noise model with idle noise accurately captures the relevant hardware behavior during multiplexing.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"In-patch multiplexing reduces expected attempts for early-stage magic-state cultivation by 45.46% (d1=3) to 72.91% (d1=5) and full-cycle attempts by 49-79% at p=2e-3, while final logical error rates stay governed by the escape-stage threshold.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"In-patch multiplexing reduces expected attempts in magic-state cultivation by creating multiple early opportunities inside one logical patch.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"e6dd34d4db0a1e6bf8e42cd03a3d8a36463466f7d2efb738fd9ff7535f38148c"},"source":{"id":"2605.03616","kind":"arxiv","version":2},"verdict":{"id":"2244a258-4aac-4154-8a3e-5f6acc7fde06","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-07T17:07:34.146653Z","strongest_claim":"Under a uniform depolarizing noise model with idle noise, the proposed protocol substantially reduces the injection-and-cultivation discard rate and the expected number of attempts required to obtain an accepted early-stage candidate. At a physical error rate of p=2×10^{-3}, the injection-and-cultivation expected attempts are reduced by 45.46% for d1=3 and by 72.91% for d1=5, relative to the single-site MSC baseline. In the direct full-cycle evaluation including escape, the expected attempts per kept logical output are further reduced by 49.04% for d1=3 and by 78.69% for d1=5.","one_line_summary":"In-patch multiplexing reduces expected attempts for early-stage magic-state cultivation by 45.46% (d1=3) to 72.91% (d1=5) and full-cycle attempts by 49-79% at p=2e-3, while final logical error rates stay governed by the escape-stage threshold.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"The escape stage and the decoder-based acceptance procedure can be kept identical to the single-site baseline without introducing new error sources or changing the logical-error behavior, and the uniform depolarizing noise model with idle noise accurately captures the relevant hardware behavior during multiplexing.","pith_extraction_headline":"In-patch multiplexing reduces expected attempts in magic-state cultivation by creating multiple early opportunities inside one logical patch."},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2605.03616/integrity.json","findings":[],"available":true,"detectors_run":[{"name":"ai_meta_artifact","ran_at":"2026-05-20T13:37:35.276907Z","status":"completed","version":"1.0.0","findings_count":0},{"name":"doi_title_agreement","ran_at":"2026-05-20T00:31:21.914587Z","status":"completed","version":"1.0.0","findings_count":0},{"name":"doi_compliance","ran_at":"2026-05-19T15:12:06.436147Z","status":"completed","version":"1.0.0","findings_count":0}],"snapshot_sha256":"8d3ff1f0f71fc87c34f4732169ef2ae693672b40a01c509e6d2d59966de3f4b8"},"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"}