Quantum Computing, Fault Tolerance, Error Correction, Logical Qubits.
qubits. For a total of: Data qubits plus syndrome measurement qubits plus flag qubits. 25 + 12 + 20 = 57 physical qubits. And I verified those numbers by counting the respective qubits in Figure 2 of the IBM paper. Heavy square code The basic formula: d² data qubits. 2 d (d minus 1) flag and