Quantum Computing, Nisq, Qubit Fidelity, Quantum Error Correction, Near Perfect Qubits.
number of nines of qubit fidelity provided or required for noisy qubits — N1, N2, or N3, etc. And N1.5 and N2.5 as well — fractional nines of reliability. Also, a contrived notation for fewer than a single nine of qubit fidelity — N0.5 for 85%, N0.05 for 80%, N0.005 for 75%, N0.0005 for 70%, and