Secure communication using coherent states
Geraldo A. Barbosa, Eric Corndorf, Prem Kumar, Horace P. Yuen, G. Mauro D'Ariano, Matteo G. A. Paris, Paolo Perinotti
Abstract
We demonstrate that secure communication using coherent states is possible. The optimal eavesdropping strategy for an M-ry ciphering scheme shows that the minimum probability of error in a measurement for bit determination can be made arbitrarily close to the pure guessing value Pe=1/2. This ciphering scheme can be optically amplified without degrading the security level. New avenues are open to secure communications at high speeds in fiber-optic or free-space channels.
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