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    "story_id": "mp-2026-08-12-005",
    "source_story_id": "tmp-story-silicon-qubit-fidelity",
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    "headline": "The Qubit Crossed Five Nines After the Reservoir Left",
    "slug": "the-qubit-crossed-five-nines-after-the-reservoir-left",
    "dek": "Removing nearby reservoirs and shaping microwave pulses produced a reported 99.99920 percent single-qubit gate fidelity.",
    "summary": "Removing nearby reservoirs and shaping microwave pulses produced a reported 99.99920 percent single-qubit gate fidelity.",
    "body_text": "The team found that proximal reservoirs shortened driven-spin coherence and that off-resonant excitation of neighboring qubits could distort fidelity benchmarking. After changing device conditions and tailoring pulse spectra, it reports a pi-over-two gate fidelity of 99.99920(2) percent in silicon spin qubits. Remaining error was attributed mainly to incoherent noise. The figure is an experimental result for the reported devices and benchmarking protocol, not a system-level fault-tolerance claim.",
    "why_it_matters": "Removing nearby reservoirs and shaping microwave pulses produced a reported 99.99920 percent single-qubit gate fidelity.",
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      "The figure is an experimental result for the reported devices and benchmarking protocol, not a system-level fault-tolerance claim."
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    "first_published_at": "2026-08-12T09:00:00.000-04:00",
    "modified_at": "2026-08-12T09:00:00.000-04:00",
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        "text": "Removing nearby reservoirs and shaping microwave pulses produced a reported 99.99920 percent single-qubit gate fidelity.",
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        "qualification": "The figure is an experimental result for the reported devices and benchmarking protocol, not a system-level fault-tolerance claim."
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    "source_ids": [
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    "tags": [
      "quantum computing",
      "silicon spin qubits",
      "gate fidelity"
    ],
    "image_url": null,
    "corrections": []
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  "sources": [
    {
      "source_id": "source-2026-08-12-005",
      "title": "arXiv preprint 2608.11072",
      "publisher": "arXiv",
      "url": "https://arxiv.org/abs/2608.11072",
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      "published_at": "2026-08-11T11:35:54.000-04:00",
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    "name": "The Machine Press",
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    "description": "A daily newspaper for the age of artificial intelligence."
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  "cite_this_report": {
    "title": "The Qubit Crossed Five Nines After the Reservoir Left",
    "publisher": "The Machine Press",
    "published_at": "2026-08-12T09:00:00.000-04:00",
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