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    "story_id": "mp-2026-11-09-009",
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    "headline": "The Safer Qubit Route Depends on Distance",
    "slug": "the-safer-qubit-route-depends-on-distance",
    "dek": "Noise modeling favors parallel spin shuttling over short paths and sequential motion over long ones.",
    "summary": "Noise modeling favors parallel spin shuttling over short paths and sequential motion over long ones.",
    "body_text": "Fault-tolerant semiconductor architectures may need to move logical qubits encoded across multiple spins. The authors model two-, three- and four-spin encodings under spatially and temporally correlated 1/f noise and derive fidelity and leakage for several shuttling protocols. Parallel motion generally protects short transfers best, while sequential motion wins at long range, with the crossover depending on device parameters. The analysis reduces prediction to a set of independently measurable pairwise dephasing factors. It is theoretical guidance rather than a device demonstration, but it connects trajectory choice directly to correlated noise and leakage.",
    "why_it_matters": "Noise modeling favors parallel spin shuttling over short paths and sequential motion over long ones.",
    "limitations": [],
    "importance": 8,
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    "first_published_at": "2026-11-09T09:00:00.000-05:00",
    "modified_at": "2026-11-09T09:00:00.000-05:00",
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        "text": "Noise modeling favors parallel spin shuttling over short paths and sequential motion over long ones.",
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    "tags": [
      "spin qubits",
      "shuttling",
      "decoherence"
    ],
    "image_url": null,
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  "sources": [
    {
      "source_id": "source-2026-11-09-009",
      "title": "arXiv preprint 2611.09873, original v1",
      "publisher": "arXiv",
      "url": "https://arxiv.org/abs/2611.09873v1",
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      "published_at": "2026-11-06T13:49:52.000-05:00",
      "accessed_at": "2026-11-09T08:25:54.496-05:00",
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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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    "title": "The Safer Qubit Route Depends on Distance",
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