论文标题
具有不对称噪声的量子密钥分布协议的关键速率
Key rates for quantum key distribution protocols with asymmetric noise
论文作者
论文摘要
当系统中存在不均匀的噪声时，我们考虑最简单的量子键分布协议中达到的渐近键率，即BB84和六状态方案。我们首先观察到，较高的量子错误率不一定意味着较低的关键率。其次，我们考虑具有优势蒸馏的协议，并表明使用键性生成具有较高量子位错误率的基础可能是有利的。然后，我们讨论优势蒸馏与纠缠蒸馏方案之间的关系。我们表明，将优势蒸馏应用于由测量结果的结果组成的一串，较高的量子位错误率与较高的量子位误差率紧密连接到二对一的纠缠蒸馏协议DEJMPS。最后，我们讨论了这些结果对实施量子密钥分布的含义。
We consider the asymptotic key rates achieved in the simplest quantum key distribution protocols, namely the BB84 and the six-state protocols, when non-uniform noise is present in the system. We first observe that higher qubit error rates do not necessarily imply lower key rates. Secondly, we consider protocols with advantage distillation and show that it can be advantageous to use the basis with higher quantum bit error rate for the key generation. We then discuss the relation between advantage distillation and entanglement distillation protocols. We show that applying advantage distillation to a string of bits formed by the outcomes of measurements in the basis with higher quantum bit error rate is closely connected to the two-to-one entanglement distillation protocol DEJMPS. Finally, we discuss the implications of these results for implementations of quantum key distribution.
