论文标题
广义CHSH不平等的无关量子键分布
Device-independent quantum key distribution from generalized CHSH inequalities
论文作者
论文摘要
与设备无关的量子密钥分布旨在提供安全保证，即使使用很大程度上未表征的设备。在最简单的情况下，这些保证源自CHSH分数，这是四个相关函数的简单线性组合。在这里，我们从CHSH分数的概括中得出安全性证明，该证明有效地考虑了两个相关函数的个体值。我们表明，这种附加信息在实践中可以使用，可以使人们获得比CHSH分数更高的关键率。我们讨论了该技术对于与设备无关的量子密钥分布的现实光子实现的潜在优势。
Device-independent quantum key distribution aims at providing security guarantees even when using largely uncharacterised devices. In the simplest scenario, these guarantees are derived from the CHSH score, which is a simple linear combination of four correlation functions. We here derive a security proof from a generalisation of the CHSH score, which effectively takes into account the individual values of two correlation functions. We show that this additional information, which is anyway available in practice, allows one to get higher key rates than with the CHSH score. We discuss the potential advantage of this technique for realistic photonic implementations of device-independent quantum key distribution.
