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    "story_id": "mp-2026-09-19-013",
    "source_story_id": "tmp-story-single-field-qubit-leakage-suppression",
    "edition_id": "mp-2026-09-19-morning-0072",
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    "position": 13,
    "story_type": "dispatch",
    "section": "research",
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    "headline": "One Control Field Cut Qubit Leakage by Three Orders",
    "slug": "one-control-field-cut-qubit-leakage-by-three-orders",
    "dek": "An analytic pulse correction suppressed simulated fast-iSWAP leakage without a second control channel.",
    "summary": "An analytic pulse correction suppressed simulated fast-iSWAP leakage without a second control channel.",
    "body_text": "Leakage-suppression recipes such as DRAG commonly assume two orthogonal controls, but baseband flux architectures may provide only one real-valued field. A Magnus-expansion construction shapes that single field for a tunable-coupler two-transmon gate. With realistic simulated parameters, the correction reduced non-adiabatic leakage from the coupler ramp by as much as three orders of magnitude. The result is a general analytic control proposal supported by device simulation, not an experimental gate demonstration.",
    "why_it_matters": "An analytic pulse correction suppressed simulated fast-iSWAP leakage without a second control channel.",
    "limitations": [
      "Leakage-suppression recipes such as DRAG commonly assume two orthogonal controls, but baseband flux architectures may provide only one real-valued field.",
      "The result is a general analytic control proposal supported by device simulation, not an experimental gate demonstration."
    ],
    "importance": 9,
    "canonical_url": "https://themachinepress.com/story/mp-2026-09-19-013/one-control-field-cut-qubit-leakage-by-three-orders",
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    "first_published_at": "2026-09-19T09:00:00.000-04:00",
    "modified_at": "2026-09-19T09:00:00.000-04:00",
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        "text": "An analytic pulse correction suppressed simulated fast-iSWAP leakage without a second control channel.",
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          "source-2026-09-19-013"
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        "qualification": "Leakage-suppression recipes such as DRAG commonly assume two orthogonal controls, but baseband flux architectures may provide only one real-valued field."
      }
    ],
    "source_ids": [
      "source-2026-09-19-013"
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    "tags": [
      "quantum control",
      "tunable couplers",
      "leakage suppression"
    ],
    "image_url": "https://themachinepress.com/issues/2026-09-19/qubit-leakage-chip-file.webp",
    "corrections": []
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  "sources": [
    {
      "source_id": "source-2026-09-19-013",
      "title": "arXiv preprint 2609.20766",
      "publisher": "arXiv",
      "url": "https://arxiv.org/abs/2609.20766",
      "canonical_url": "https://arxiv.org/abs/2609.20766",
      "source_type": "primary_research",
      "is_primary_source": true,
      "published_at": "2026-09-17T13:46:01.000-04:00",
      "accessed_at": "2026-09-19T08:30:21.326-04:00",
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  "publisher": {
    "name": "The Machine Press",
    "url": "https://themachinepress.com",
    "description": "A daily newspaper for the age of artificial intelligence."
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  "cite_this_report": {
    "title": "One Control Field Cut Qubit Leakage by Three Orders",
    "publisher": "The Machine Press",
    "published_at": "2026-09-19T09:00:00.000-04:00",
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