Karol Bartkiewicz, Karel Lemr, Antonín Černoch, Jan Soubusta, Adam Miranowicz
We present experimental symmetric individual eavesdropping on some quantum key distribution protocols using optimally cloned qubits generated by a recently developed photonic multifunctional state-dependent quantum cloner. We established new security bounds on bit-error rates, equal to 13.65% and 14.9%, for the analyzed attacks on the Bennett-Brassard BB84 protocol and on the trine-state spherical code protocol of Renes, respectively. We showed that high success rate of our device makes the eavesdropping possible by hiding it in usual transmission losses.
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http://arxiv.org/abs/1206.0144
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