Symbol n
n 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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An [[n, k, d]] code encodes k logical qubits into n physical qubits with distance d . The stabiliser generators are measured repeatedly. Because each commutes with every other and with the logical operators, measuring them extracts no information about which encoded state is present. What it extracts is whether an error has anticommuted with a given check — a single classical bit per generator, per round. That bit string is the syndrome.
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Equation 6 · Quantum Information
Error Correction Is the Whole Problem in Quantum Computing
This mathematical expression combines the displayed quantities; its precise role follows from the surrounding article text.
An [[n, k, d]] code encodes k logical qubits into n physical qubits with distance d . The stabiliser generators are measured repeatedly. Because each commutes with every other and with the logical operators, measuring them extracts no information about which encoded state is present. What it extracts is whether an error has anticommuted with a given check — a single classical bit per generator, per round. That bit string is the syndrome.