Quantum Computing, Fault Tolerance, Error Correction, Logical Qubits.
10, 50, 33, or 20 operations. Two nines. Such as 99%, 99.5%, or even 99.8%. One error in 100 operations. Three nines. Such as 99.9%, 99.95%, or even 99.98%. One error in 1,000 operations. Four nines. Such as 99.99%, 99.995%, or even 99.998%. One error in 10,000 operations. Five nines. Such as