Experimental eavesdropping attack against Ekert’s protocol based on Wigner’s inequality
Fabio Antonio Bovino, A.M. Colla, Giuseppe Castagnoli, Stefania Castelletto, Ivo Pietro Degiovanni, Maria Luisa Rastello · Physical Review A · 2003
We experimentally implemented an eavesdropping attack against the Ekert protocol for quantum key distribution based on the Wigner inequality. We demonstrate a serious lack of security of this protocol when the eavesdropper gains total control of the source. In addition we tested a modified Wigner inequality which should guarantee a secure quantum key distribution.