State-of-the-Art in Quantum Key Distribution for Next-Generation Wireless Networks

By leveraging the fundamental principles of quantum mechanics, quantum cryptography represents a paradigm shift in secure communication by providing information-theoretic security, where any eavesdropping attempt can be intrinsically detected, and by offering resistance to computational attacks, including those posed by future quantum computers that threaten classical cryptographic schemes. To establish Quantum Key Distribution (QKD) as a significant tool in cybersecurity, this study examines the foundational principles of quantum cryptography, focusing on quantum algorithms, quantum bits, and quantum gates. We examine the fundamental QKD protocols and conduct a comparative study of prominent QKD protocols, including BB84, B92, E91, B92, SARG04, COW, Continuous Variable, Six State, Device Independent, and advanced protocols such as MDI-QKD and Twin-Field QKD, to evaluate key rate, distance, and security parameters. A systematic review of the literature has been conducted on the evolution of QKD protocols and networks, QKD integration with advanced technologies like blockchain, IoT, and machine learning, and the practical deployment of quantum communication is studied in this paper. The integration of AI and ML into QKD systems is investigated to explain future algorithm development and performance improvements. Also the function of QKD in quantum networks and the Internet of Things (IoT) is assessed. This paper further delves into the operation of quantum networks, detailing the roles of quantum relays, routers, repeaters, and Free Space Optics (FSO) in enhancing the efficiency and scalability of QKD. Assessing simulators such as SimulaQron, Qiskit, QuNetSim, and QKDNetSim, offering a perception into experimental implementation and protocol validation, resolves the difficulties in quantum-secured communication systems. At last, some security threats are discussed, including Laser damage, Trojan horse attacks, photon-number splitting, and detector blinding, for mitigation of risk strategies. Overall, this work contributes to the importance of QKD and quantum networks in shaping the future of secure wireless communication.