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Device-independent quantum communication offers a powerful route to secure information processing, but its practical realization over long distances remains challenging due to loss, imperfect light–matter interfaces, and detector inefficiencies. In this talk, I will present a feasible scheme for demonstrating Bell nonlocality and implementing device-independent quantum key distribution (DIQKD) between distant atomic qubits in cavity-based architectures using hybrid atom–light entanglement. A comprehensive theoretical model is developed that incorporates the dominant experimental imperfections, including transmission losses, finite light–matter coupling strengths, and realistic detection efficiencies. Our results show that significant violations of the Bell–Clauser–Horne–Shimony–Holt (CHSH) inequality, together with positive device-independent key rates over distances of several tens of kilometers, can be achieved with current or near-term experimental capabilities. These findings highlight cavity-based quantum networks with coherent-state photonic encodings as a promising and scalable platform for long-distance device-independent quantum communication. |