Quantum Computing, Fault Tolerance, Error Correction, Logical Qubits.
encodes 1 logical qubit in 9 physical qubits and can correct for arbitrary errors in a single qubit.” https://en.wikipedia.org/wiki/Quantum_error_correction 7 “Andrew Steane found a code which does the same with 7 instead of 9 qubits, see Steane code.”