论文标题
实验性诱饵状态BB84通过湍流通道的量子键分布
Experimental decoy state BB84 quantum key distribution through a turbulent channel
论文作者
论文摘要
在湍流条件下的自由空间量子键分布中，散射和梁徘徊会导致强度波动，从而增加了检测到的信噪比。当频道的传输低于阈值时，可以通过拒绝接收的位来减轻这种效果。因此，尽管位删除，但总体错误率降低，安全键率也会增加。在诱饵状态BB84 QKD中，已经提出了几种找到理想阈值的方法。一种有希望的方法是前缀 - 阈值实时选择（P-RT），其中可以在数据收集之前选择截止，并且独立于强度分布。在这项工作中，我们在实验室环境中执行有限大小的诱饵状态BB84 QKD，在该环境中，我们使用声学调制器模拟大气湍流。我们表明，P-RT可以产生更高的安全键率，尤其是在较高的损失下。此外，我们验证P-RTS是否具有强大的截止值，即使预测的透射率与实际透射率不符。
In free-space Quantum Key Distribution in turbulent conditions, scattering and beam wandering cause intensity fluctuations which increase the detected signal-to-noise ratio. This effect can be mitigated by rejecting received bits when the channel's transmittance is below a threshold. Thus, the overall error rate is reduced and the secure key rate increases despite the deletion of bits. In Decoy State BB84 QKD, several methods to find the ideal threshold have already been proposed. One promising method is the Prefixed-Threshold Real-time Selection (P-RTS) where a cutoff can be chosen prior to data collection and independently of the intensity distribution. In this work we perform finite-size Decoy State BB84 QKD in a laboratory setting where we simulate the atmospheric turbulence using an acousto-optical modulator. We show that P-RTS can yield considerably higher secure key rates, especially at higher losses. In addition, we verify that P-RTS gives a robust cutoff even when the predicted transmittance does not match the actual transmittance.
