Equation 5 · Part 2 · Error Correction Is the Whole Problem in Quantum Computing
Symbol psi_L
What this part means
ps is part of the quantity the equation computes from the expression on the right.
Its job in the formula
ps is part of the quantity the equation computes from the expression on the right.
Full expression→Symbol psi_L→Article meaning
The passage around this formula
The technique that makes this work is the stabiliser formalism, given its general fault-tolerant treatment by Gottesman [ 4 ] . A code is defined not by listing its states but by naming a set of commuting Pauli operators — the stabiliser generators — whose joint +1 eigenspace is the code space: . 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…
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