Quantum key distribution: theory for application

Masahiro Takeoka

Jincheng Zhang

Quantum Key Distribution (QKD) promises unconditionally secure communication based on the laws of physics. This paper explores the application of information theory to optimize the key distribution process within a QKD protocol. We propose an algorithm that leverages quantum entanglement to enhance key distribution efficiency and security. The core mechanism involves manipulating the state of entangled particles to shift the key towards a more secure state. The paper presents a novel approach to optimize the entanglement parameters, demonstrating potential improvements in key generation and security compared to existing QKD protocols. The study analyzes the impact of optimized entanglement on key generation, focusing on the reduction of computational complexity and the amplification of the security level.

Dagmar Bruß, Norbert Lütkenhaus

Takeoka, Masahiro, Masahiro Takeoka

This chapter describes quantum cryptography. Quantum cryptography is one of the most successful applications of quantum optics and quantum information theory. The key technology of quantum cryptography is quantum key distribution (QKD), which can distribute secret keys that are unbreakable by any computational means or physical eavesdropping attacks. The chapter starts with a brief overview of the current cryptographies and their potential threats, then describes the security and basic operation principles of quantum cryptography. We will also see that quantum cryptography has already been deployed into the field testbed, and proof-of-concept demonstrations of its applications will soon be available in practical use.

László Gyöngyösi, László Bacsárdi, Sándor Imre

Quantum key distribution (QKD) protocols represent an important practical application of quantum information theory. QKD schemes enable legal parties to establish unconditionally secret communication by exploiting the fundamental attributes of quantum mechanics. Here we present an overview of QKD rotocols. We review the principles of QKD systems, the implementation basis, and the application of QKD protocols in the standard Internet and the quantum Internet.

Daniel J. Rogers