Quantum Computing, Fault Tolerance, Error Correction, Logical Qubits.
qubits — 5 and 8 logical qubits — are hardware fabrication — more qubits, lower error rate, and better connectivity, rather than a pressing need to develop algorithms and applications for 5–20 qubits. Ditto for 12, 16, and 20 logical qubits — fabrication challenges are the critical driver, not