A theoretical and experimental test on the security of quantum cryptography key distribution Ekert's protocol based on Wigner's inequality

Stefania Castelletto; Ivo Pietro Degiovanni; Maria Luisa Rastello; Ivano Ruo Berchera; Fabio Antonio Bovino; Anna Maria Colla; Giuseppe Castagnoli

doi:10.1117/12.506703

3 February 2004 A theoretical and experimental test on the security of quantum cryptography key distribution Ekert's protocol based on Wigner's inequality

Stefania Castelletto, Ivo Pietro Degiovanni, Maria Luisa Rastello, Ivano Ruo Berchera, Fabio Antonio Bovino, Anna Maria Colla, Giuseppe Castagnoli

Author Affiliations +

Proceedings Volume 5161, Quantum Communications and Quantum Imaging; (2004) https://doi.org/10.1117/12.506703
Event: Optical Science and Technology, SPIE's 48th Annual Meeting, 2003, San Diego, California, United States

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.

Citation Download Citation

Stefania Castelletto, Ivo Pietro Degiovanni, Maria Luisa Rastello, Ivano Ruo Berchera, Fabio Antonio Bovino, Anna Maria Colla, and Giuseppe Castagnoli "A theoretical and experimental test on the security of quantum cryptography key distribution Ekert's protocol based on Wigner's inequality", Proc. SPIE 5161, Quantum Communications and Quantum Imaging, (3 February 2004); https://doi.org/10.1117/12.506703

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available