论文标题
被动连续变量量子键分布
Passive continuous variable quantum key distribution
论文作者
论文摘要
已提出了用于消除源中侧通道的离散变量协议的被动量子键分布（QKD）。不幸的是，被动DV-QKD协议的关键速率受到筛选损失和其他量子错误的影响。在这项工作中，我们提出了被动连续变量量子键分布的一般框架。令人惊讶的是，我们发现被动源是离散调制的连续变量量子键分布（DMCV QKD）协议的理想候选者。使用相位空间重新映射方案，我们表明被动DMCV QKD提供的关键速度与其主动对应物相同。考虑到删除困扰活性的侧通道的重要优势，被动DMCV QKD是一个有前途的选择。此外，我们的协议通过允许无调制器量子键分布来使系统更简单。最后，我们通过实验表征了被动DMCV QKD源，从而显示了其实用性。
Passive quantum key distribution (QKD) has been proposed for discrete variable protocols to eliminate side channels in the source. Unfortunately, the key rate of passive DV-QKD protocols suffers from sifting loss and additional quantum errors. In this work, we propose the general framework of passive continuous variable quantum key distribution. Rather surprisingly, we find that the passive source is a perfect candidate for the discrete-modulated continuous variable quantum key distribution (DMCV QKD) protocol. With the phase space remapping scheme, we show that passive DMCV QKD offers the same key rate as its active counterpart. Considering the important advantage of removing side channels that have plagued the active ones, passive DMCV QKD is a promising alternative. In addition, our protocol makes the system much simpler by allowing modulator-free quantum key distribution. Finally, we experimentally characterize the passive DMCV QKD source, thus showing its practicality.
