论文标题
Bell-Chsh违规和局部过滤在量子密钥分布中的作用
Role of Bell-CHSH violation and local filtering in quantum key distribution
论文作者
论文摘要
在本文中，我们分析了贝尔违规与纠缠辅助量子密钥分布（QKD）协议的安全关键率之间的关系。具体来说，我们解决了一个问题，违反贝尔是必要的还是足以进行安全沟通的问题。但是，我们构建了一类未显示贝尔违规行为的状态，这些状态可在本地过滤后用于安全通信。同样，我们确定了另一类状态，这些状态显示出违规，但即使在本地过滤后也无法用于生成安全密钥。这两类国家的存在表明，对于QKD来说，违反贝尔作为初始资源既不需要也不足够。因此，我们的工作迫使传统思想偏离传统思维，即违反钟形的程度是量子通信的关键资源，并带来了当地过滤的作用。
In this article, we analyse the relationship between the Bell violation and the secure key rate of entanglement assisted quantum key distribution (QKD) protocols. Specifically, we address the question whether Bell violation is necessary or sufficient for secure communication. We construct a class of states which do not show Bell violation, however, which can be used for secure communication after local filtering. Similarly, we identify another class of states which show Bell violation but can not be used for generating secure key even after local filtering. The existence of these two classes of states demonstrates that Bell violation as an initial resource is neither necessary nor sufficient for QKD. Our work therefore forces a departure from traditional thinking that the degree of Bell violation is a key resource for quantum communication and brings out the role of local filtering.
