Quantum Cryptography with Coherent States

Details Quantum Cryptography with Coherent States Quantum Cryptography with Coherent States

1995-02-21

arxiv.org/abs/quant-ph/9502020v1

Physics

Quantum Physics

20 pp. Revtex, Figures available from the authors upon request, To be published in PRA (March 95)

Scientific paper

10.1103/PhysRevA.51.1863

The safety of a quantum key distribution system relies on the fact that any eavesdropping attempt on the quantum channel creates errors in the transmission. For a given error rate, the amount of information that may have leaked to the eavesdropper depends on both the particular system and the eavesdropping strategy. In this work, we discuss quantum cryptographic protocols based on the transmission of weak coherent states and present a new system, based on a symbiosis of two existing ones, and for which the information available to the eavesdropper is significantly reduced. This system is therefore safer than the two previous ones. We also suggest a possible experimental implementation.

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