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首页> 外文会议>Conference on Quantum Communications and Quantum Imaging; Aug 6-8, 2003; San Diego, California, USA >A theoretical and experimental test on the security of quantum cryptography key distribution Ekert's protocol based on Wigner's inequality
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A theoretical and experimental test on the security of quantum cryptography key distribution Ekert's protocol based on Wigner's inequality

机译：基于Wigner不等式的量子密码密钥分发Ekert协议的安全性的理论和实验测试

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摘要

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 Ekert'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.
机译：在本文中，我们在理论上和实验上都证明了当以纠缠光子对为源时基于Wigner不等式的Ekert量子密钥分配协议的不安全性。基于Wigner不等式的Ekert协议的安全性证明在于验证对W≥0（对应于局部现实理论）的违反。我们强调指出，当夏娃控制两个量子通道时，就会违反维格纳不等式。我们给出该结果的理论动机，并通过实现夏娃获得对光子对源的完全控制的条件，进行了证明这一弱点的实验。此外，我们计算了该不等式的改进版本，该版本可保证安全的量子密钥分配，从而通过实验证明了这一点。

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