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    "story_id": "mp-2026-08-20-004",
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    "headline": "The Error Check Grew Beyond Two Levels",
    "slug": "the-error-check-grew-beyond-two-levels",
    "dek": "Generalized Pauli checks mapped higher-dimensional errors to ancilla readouts and exceeded 97.5 percent mitigated fidelity in numerical tests.",
    "summary": "Generalized Pauli checks mapped higher-dimensional errors to ancilla readouts and exceeded 97.5 percent mitigated fidelity in numerical tests.",
    "body_text": "The proposed check pairs extend Pauli Check Sandwiching from qubits to arbitrary-dimensional qudits with Heisenberg-Weyl operators. The authors prove that each modeled error maps to a distinct ancilla readout and validate the construction from dimension two through nine, reporting error-mitigated fidelities above 97.5 percent under simulated depolarizing noise. Hardware overhead and real-device behavior remain open engineering questions.",
    "why_it_matters": "Generalized Pauli checks mapped higher-dimensional errors to ancilla readouts and exceeded 97.5 percent mitigated fidelity in numerical tests.",
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      "Hardware overhead and real-device behavior remain open engineering questions."
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    "first_published_at": "2026-08-20T09:00:00.000-04:00",
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        "qualification": "Hardware overhead and real-device behavior remain open engineering questions."
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    "tags": [
      "quantum error mitigation",
      "qudits",
      "Pauli checks"
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  "sources": [
    {
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      "title": "arXiv preprint 2608.18332",
      "publisher": "arXiv",
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      "published_at": "2026-08-17T20:00:00.000-04:00",
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    "title": "The Error Check Grew Beyond Two Levels",
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