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Phys. Rev. A 68, 034309 (2003) [4 pages]

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

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F. A. Bovino*, A. M. Colla, and G. Castagnoli
Elsag S.p.A., Via Puccini 2, 16154 Genova, Italy

S. Castelletto, I. P. Degiovanni†, and M. L. Rastello
Istituto Elettrotecnico Nazionale Galileo Ferraris, Strada delle Cacce 91, 10135 Torino, Italy

Received 28 April 2003; published 29 September 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.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevA.68.034309
DOI:
10.1103/PhysRevA.68.034309
PACS:
03.67.Dd, 03.65.Ud

*Electronic address: Fabio.Bovino@elsag.it

†Electronic address: degio@ien.it

 
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