Example Concept: Entanglement allows for the creation of correlated qubit states across a quantum network, which is essential for quantum error correction schemes such as the surface code. These schemes use entangled qubits to detect and correct errors without directly measuring the qubits' states, preserving quantum information. However, maintaining entanglement over long distances can be challenging due to decoherence and noise, which increase error rates. Techniques like entanglement purification and quantum repeaters are employed to mitigate these effects and improve network reliability.