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This thesis by Alvaro Alarcón Cuevas explores advancements in quantum communication through the development of a fiber-optic platform. The work addresses the challenges of data security in optical networks by implementing quantum key distribution (QKD) methods, which utilize natural properties rather than mathematical constructs for data encryption. The thesis introduces a novel approach that combines phase-coded systems with time-bin schemes, effectively reducing losses and demonstrating compatibility with existing optical networks. The study successfully transmits phase-coded single-photon states over a 500-meter few-mode fiber and supports orbital angular momentum (OAM) modes, paving the way for more efficient quantum communication systems. This research is intended for professionals and academics in the fields of quantum mechanics and optical engineering.

Quantum communication. --- Quantum cryptography.

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Jonathan Jogenfors' dissertation, 'Breaking the Unbreakable: Exploiting Loopholes in Bell’s Theorem to Hack Quantum Cryptography,' explores the vulnerabilities in quantum key distribution systems. By examining energy-time entangled systems, the work identifies loopholes that could be exploited by attackers. The thesis discusses the no-cloning theorem and the potential of quantum money, proposing a novel concept of Quantum Bitcoin, which integrates blockchain technology. The study aims to enhance the security of quantum cryptography and is intended for researchers and professionals in quantum physics and cryptography.

Quantum cryptography. --- Bell's theorem.

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"This new book discusses the concepts while also highlighting the challenges in the field of quantum cryptography, also covering cryptographic techniques and cyber security techniques, in a single volume. It comprehensively covers important topics in the field of quantum cryptography with applications, including quantum key distribution, position-based quantum cryptography, quantum teleportation, quantum e-commerce, quantum cloning, cyber security techniques architectures and design, cyber security techniques management, software defined networks, and cyber security techniques for 5G communication. The text also discusses the security of practical quantum key distribution systems, applications and algorithms developed for quantum cryptography, as well as cyber security through quantum computing and quantum cryptography. The text will be beneficial for graduate students, academic researchers, and professionals working in the fields of electrical engineering, electronics and communications engineering, computer science, and information technology"--

Data encryption (Computer science) --- Computer networks --- Quantum cryptography. --- Security measures.

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This open access book covers the most cutting-edge and hot research topics and fields of post-quantum cryptography. The main purpose of this book is to focus on the computational complexity theory of lattice ciphers, especially the reduction principle of Ajtai, in order to fill the gap that post-quantum ciphers focus on the implementation of encryption and decryption algorithms, but the theoretical proof is insufficient. In Chapter 3, Chapter 4 and Chapter 6, author introduces the theory and technology of LWE distribution, LWE cipher and homomorphic encryption in detail. When using random analysis tools, there is a problem of "ambiguity" in both definition and algorithm. The greatest feature of this book is to use probability distribution to carry out rigorous mathematical definition and mathematical demonstration for various unclear or imprecise expressions, so as to make it a rigorous theoretical system for classroom teaching and dissemination. Chapters 5 and 7 further expand and improve the theory of cyclic lattice, ideal lattice and generalized NTRU cryptography. This book is used as a professional book for graduate students majoring in mathematics and cryptography, as well as a reference book for scientific and technological personnel engaged in cryptography research.

Post-Quantum Cryptography --- Gauss Lattice --- Reduction --- Learning With Errors --- FHE --- Fourier transform --- Ideal lattice --- NTRU --- Smoothing parameters --- Discrete Gaussian measure

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Quantum communication --- Quantum communication. --- Quantum communications --- Optical communications --- quantum cryptography --- optical fibre networks --- quantum optics --- quantum computing --- quantum wireless communication --- Teoria quàntica --- Teoria quàntica.