Example Concept: Quantum error correction works by encoding logical qubits into multiple physical qubits, allowing the system to detect and correct errors without measuring the quantum information directly. For instance, in the surface code, a logical qubit is represented by a 2D lattice of physical qubits, where stabilizer measurements identify errors, and correction operations are applied to maintain the integrity of the logical qubit. This process effectively increases the threshold for error rates, enabling more complex and longer quantum computations.