Example Concept: Quantum error correction codes, such as the Shor code or the surface code, handle simultaneous qubit errors by using a combination of redundancy and syndrome measurements. These codes encode a logical qubit into multiple physical qubits and perform syndrome measurements to detect error patterns. By analyzing these syndromes, the code can identify the type and location of errors, allowing for correction through appropriate gate operations. The surface code, in particular, is known for its ability to handle multiple errors through a 2D lattice of qubits, where local measurements provide the necessary information to correct errors across the lattice.