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Proceedings Paper

A theoretical and experimental test on the security of quantum cryptography key distribution Ekert's protocol based on Wigner's inequality
Author(s): Stefania Castelletto; Ivo Pietro Degiovanni; Maria Luisa Rastello; Ivano Ruo Berchera; Fabio Antonio Bovino; Anna Maria Colla; Giuseppe Castagnoli
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Paper Abstract

In this paper we prove both theoretically and experimentally the insecurity of the Ekert’s protocol for quantum-key distribution when based on the Wigner inequality when entangled photon pairs are used as source. The security proof of the Eckert’s protocol based on Wigner’s inequality consists in verifying the violation of W ≥ 0 (which corresponds to local-realistic theories). We highlight that a violation of the Wigner’s inequality occurs when Eve controls the two quantum channels. We give the theoretical motivation for this result and we perform an experiment proving this weakness, by realizing the condition of Eve gaining total control of the source of photon pairs. In addition we calculate the modified version of this inequality which guarantees safe quantum-key distribution, thus proving it experimentally.

Paper Details

Date Published: 3 February 2004
PDF: 11 pages
Proc. SPIE 5161, Quantum Communications and Quantum Imaging, (3 February 2004); doi: 10.1117/12.506703
Show Author Affiliations
Stefania Castelletto, Istituto Elettrotechnio Nazionale Galieo Ferraris (Italy)
Ivo Pietro Degiovanni, Istituto Elettrotechnio Nazionale Galieo Ferraris (Italy)
Maria Luisa Rastello, Istituto Elettrotechnio Nazionale Galieo Ferraris (Italy)
Ivano Ruo Berchera, Istituto Elettrotechnio Nazionale Galieo Ferraris (Italy)
Fabio Antonio Bovino, Elsag SpA (Italy)
Anna Maria Colla, Elsag SpA (Italy)
Giuseppe Castagnoli, Elsag SpA (Italy)

Published in SPIE Proceedings Vol. 5161:
Quantum Communications and Quantum Imaging
Ronald E. Meyers; Yanhua Shih, Editor(s)

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