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Quantum Cloning, Eavesdropping and Bell's inequality

N. Gisin, B. Huttner

quant-pharXiv:quant-ph/9611041

Abstract

We analyze various eavesdropping strategies on a quantum cryptographic channel. We present the optimal strategy for an eavesdropper restricted to a two-dimensional probe, interacting on-line with each transmitted signal. The link between safety of the transmission and the violation of Bell's inequality is discussed. We also use a quantum copying machine for eavesdropping and for broadcasting quantum information.

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