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arXiv quant-ph/0503158quant-ph
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Kochen-Specker定理作为安全量子密钥分发的前提

Kochen-Specker theorem as a precondition for secure quantum key distribution

Koji Nagata

摘要:

我们证明了(1)Ekert 91不等式的违背是Kochen-Specker(KS)定理证明的充分条件,(2)Bennett-Bachard-Mermin 92(BBM)不等式的违背也是KS定理证明的充分条件.因此,每个QKD协议的成功揭示了量子理论的非经典特征,在这个意义上,KS现实主义被违反。进一步证明了Ekert不等式和BBM不等式都是由可证明的纠缠见证不等式证明的.在这里,我们将这两个密钥分发过程的成功与无隐变量定理和可验证纠缠联系起来。我们还讨论了量子理论的希尔伯特空间形式中KS实在论与Bell定域实在论的区别。

英文摘要:

We show that (1) the violation of the Ekert 91 inequality is a sufficient condition for certification of the Kochen-Specker (KS) theorem, and (2) the violation of the Bennett-Brassard-Mermin 92 (BBM) inequality is, also, a sufficient condition for certification of the KS theorem. Therefore the success in each QKD protocol reveals the nonclassical feature of quantum theory, in the sense that the KS realism is violated. Further, it turned out that the Ekert inequality and the BBM inequality are depictured by distillable entanglement witness inequalities. Here, we connect the success in these two key distribution processes into the no-hidden-variables theorem and into witness on distillable entanglement. We also discuss the explicit difference between the KS realism and Bell's local realism in the Hilbert space formalism of quantum theory.

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