Quantum Key Distribution
Philip Chan, Itzel Lucio-Mart\'inez, Xiaofan Mo, and Wolfgang Tittel

TL;DR
This chapter introduces quantum key distribution (QKD), explaining its principles, current state, and a real-world deployment, highlighting the role of diode lasers and future quantum network prospects.
Contribution
It provides an accessible overview of QKD, details a practical deployment example, and discusses future developments in quantum networks.
Findings
Description of a real-world QKD system between Calgary and SAIT
Overview of diode lasers in QKD applications
Discussion on future quantum network developments
Abstract
This chapter describes the application of lasers, specifically diode lasers, in the area of quantum key distribution (QKD). First, we motivate the distribution of cryptographic keys based on quantum physical properties of light, give a brief introduction to QKD assuming the reader has no or very little knowledge about cryptography, and briefly present the state-of-the-art of QKD. In the second half of the chapter we describe, as an example of a real-world QKD system, the system deployed between the University of Calgary and SAIT Polytechnic. We conclude the chapter with a brief discussion of quantum networks and future steps.
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Taxonomy
TopicsQuantum Information and Cryptography · Quantum Mechanics and Applications · Advanced Statistical Modeling Techniques
