Quantum Cryptography

William P. Risk and Donald S. Bethune

The desire to communicate in secrecy is an ancient one: literature surviving from the time of the Roman Empire describes a substitution cipher used by Julius Caesar; earlier Greek writings describe methods used to conceal confidential military and diplomatic communiqu├ęs from the eyes of unauthorized readers. Two millennia later, modern concepts of quantum mechanics are being combined with state-of-the-art optoelectronics to provide a truly novel solution to this ancient problem.

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