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Lecture notes in computer science

Practical Free-Space Quantum Cryptography

Richard Hughes, W. T. Buttler, Paul G. Kwiat, S. K. Lamoreaux, G. G. Luther, George L. Morgan, J. E. Nordholt, Charles G. Peterson, Charles M. Simmons

Published Jan 1, 1999• 3 citations
Publisher
DOI
10.1007/3-540-49208-9_17

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A new practical free space quantum communication system is proposed, it is based on the principle of quantum secure direct communication. Quantum cryptography is a practical method to realize free space optical communication. Different from the existing free space quantum key distribution communication system, the free space quantum secure direct communication is deterministic and the system is more simple. In this paper, a new structure of four transmitting channels is prensented, this structure could increase the security and capacity of system. The setup of transmitter and receiver of each transmitting channel is discussed in detail, and the communication process is analyzed. The result shows that this free space quantum system could be realized and can work over long distance.