Symbol Lambda
Lambda is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.
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Why this formula appears here
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.
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Equation 29 · Quantum Information
Error Correction Is the Whole Problem in Quantum Computing
This equation states a bound: one expression must stay on the indicated side of the other under the article’s assumptions.
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.
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