Quantum Computing, Fault Tolerance, Error Correction, Logical Qubits.
of near-perfect qubits — with qubit reliability in the range 99.9% to 99.9999%. FTSSQ — Fault-Tolerant Small-Scale Quantum devices. Under 50 or so logical qubits. Perfect computation, but insufficient for quantum advantage. FTISQ — Fault-Tolerant Intermediate-Scale Quantum devices. Start of quantum