Example Concept: In a quantum circuit, entanglement is used to create correlations between qubits, which is essential for quantum algorithms like Grover's or Shor's. However, entangled qubits are more susceptible to correlated errors, where a single error event can affect multiple qubits simultaneously. To mitigate this, quantum error correction codes, such as the surface code, are employed to detect and correct errors by spreading the information of a logical qubit across multiple physical qubits, thus protecting the entangled state.