Describe the role of entanglement in quantum cellular automata and its impact on the computational capabilities and efficiency of QCA.

Entanglement plays a critical role in quantum cellular automata, enabling complex correlations between cells that can be harnessed for computational purposes. It enhances the computational capabilities of QCA by allowing for parallel processing and quantum parallelism. However, managing and maintaining entanglement is challenging due to decoherence and noise, which can affect the efficiency and fidelity of the computation.