Quantum Error Correction, Noise & Decoherence

Why real qubits are noisy, the difference between physical and logical qubits, and how surface codes trade physical qubit count for error resilience.

Read

55 min

Practice MCQs

25

Interview QA

25

Edition

v2

Editorial status

Reviewed

Relevant for

Quantum Software Engineer

Scope: IBM Quantum current QEC, noise, mitigation, and fault-tolerance guidance; surface-code and QEC literature reviewed 2026-09-04.