Equation 29 · Error Correction Is the Whole Problem in Quantum Computing
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Below threshold means > 1 . Above threshold, adding qubits makes the logical qubit worse, because each additional physical qubit contributes more error than the larger code removes. This is the sense in which qubit count is not merely an incomplete figure of merit but can be an actively misleading one.
Sources cited in the article section
- [5] Resilient Quantum Computation ↗
- [6] Fault-Tolerant Quantum Computation with Constant Error Rate ↗
- [15] Suppressing quantum errors by scaling a surface code logical qubit ↗
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