Quantum Computing, Fault Tolerance, Error Correction, Logical Qubits.
65 physical qubits per logical qubit. My goal here is not to delve into the details of the formula, but simply to show how the two numbers were derived. Heavy hexagon code The basic formula: (5 * d² — 2 * d — 1) / 2 So for d = 5: (5 * 5² — 2 * 5–1) / 2 = (125–10–1) / 2 = 114 / 2 = 57 physical