Quantum Communication and Cybersecurity

Abstract: This book presents a comprehensive and interdisciplinary examination of the convergence between quantum information science and cybersecurity. It addresses the foundational problem of securing digital communication against both current and future threats, particularly those arising from the advent of quantum computing. The book begins by analyzing core principles of quantum mechanics—such as superposition, entanglement, and the no-cloning theorem—that enable physically secured methods for information transmission. Classical cryptographic systems are reviewed in parallel, with emphasis on their vulnerabilities in the face of quantum attack models such as Shor’s and Grover’s algorithms. Methodologically, the book synthesizes theoretical modeling, protocol design, security analysis, and network architecture to evaluate quantum key distribution (QKD), quantum communication networks, and post-quantum cryptography. Implementation challenges, including quantum error correction, side-channel threats, and interoperability with classical systems, are systematically addressed. Case studies and experimental benchmarks provide insight into real-world deployment scenarios. The book concludes by exploring ethical, legal, and geopolitical implications of quantum-secure infrastructures. It proposes a multidimensional governance framework that promotes transparency, equity, and strategic collaboration. By combining technical depth with policy awareness, this work offers an integrated roadmap for building secure communication systems in the emerging post-quantum era. Keywords Quantum communication, cybersecurity, quantum key distribution, QKD, quantum cryptography, post-quantum cryptography, quantum networks, Shor’s algorithm, Grover’s algorithm, quantum error correction, entanglement, quantum protocols, cryptographic security, digital sovereignty, quantum internet, information theory, cyber policy, secure communication, quantum ethics, quantum governance