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We experimentally implemented an eavesdropping attack against the Ekertprotocol for quantum key distribution based on the Wigner inequality. Wedemonstrate a serious lack of security of this protocol when the eavesdroppergains total control of the source. In addition we tested a modified Wignerinequality which should guarantee a secure quantum key distribution.Comment: RevTex style, 5 pages, 6 figures, to appear on PRA with minor  revisio

Experimental eavesdropping attack against Ekert’s protocol based on Wigner’s inequality