This handbook provides the first comprehensive overview of the field of Quantum Computing and Communications (QCC). It looks at the background to an emerging technology which promises to revolutionise information processing and, as a result, many areas of computing and communications. It gives an easy-to-follow introduction to the main areas of interest, including: - Fundamentals of Quantum Information; - Experimental Realizations; - Applications; - Quantum Cryptography; - Categories and Definitions.This is not just a reference for those working in the field; written in an accessible style by Michael Brooks - an experienced journalist for New Scientist magazine and the Guardian newspaper - it aims to communicate with anyone working in computer science, physics, chemistry, mathematics and engineering who wants to know what QCC technology will mean to them.