Optimal eavesdropping on noisy states in quantum key distribution

Details Optimal eavesdropping on noisy states in quantum key distribution Optimal eavesdropping on noisy states in quantum key distribution

2008-04-03

arxiv.org/abs/0804.0587v1

Int. J. Quant. Inform. 7, 297 - 306 (2009)

Physics

Quantum Physics

5 pages, 2 figures

Scientific paper

10.1142/S0219749909004554

We study eavesdropping in quantum key distribution with the six state protocol,when the signal states are mixed with white noise. This situation may arise either when Alice deliberately adds noise to the signal states before they leave her lab, or in a realistic scenario where Eve cannot replace the noisy quantum channel by a noiseless one. We find Eve's optimal mutual information with Alice, for individual attacks, as a function of the qubit error rate. Our result is that added quantum noise can make quantum key distribution more robust against eavesdropping.

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