Secure communication using coherent states

Details Secure communication using coherent states Secure communication using coherent states

2002-10-11

arxiv.org/abs/quant-ph/0210089v2

Physics

Quantum Physics

2 1/2 pages, 1 figure, Proceedings of the Sixth International Conference on Quantum Communication, Measurement and Computing P

Scientific paper

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 P_e=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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