ABSTRACT
The most successful practical applications of quantum mechanics in information theory have been in the field of communication. This is a very old field that has taken inputs from engineering, pure mathematics and computer science apart from physics. It is only natural that application of quantum techniques here should be among the first to be considered and implemented. Modern technology in optical communication using laser light and optical fiber cables is sufficiently advanced that it can quickly be adapted to using photons as the quantum carriers of information.
