论文标题
自由空间连续可变的安全量子通信的褪色频道估计
Fading channel estimation for free-space continuous-variable secure quantum communication
论文作者
论文摘要
我们研究了波动通道的估计及其对连续可变量子密钥分布的安全性的影响。我们提出了一种基于估计透射数据的聚类的新型估计方案。我们表明，关于透射率是否固定的不确定性导致关键率较低。但是，如果测量总数较大，即使对于高度波动的通道，也可以使用我们的方法获得类似于非裂开通道的关键速率。我们还使用来自大气量子通道的实验数据来验证我们的理论假设。因此，我们的方法有望在强烈波动的湍流大气通道上安全量子通信。
We investigate estimation of fluctuating channels and its effect on security of continuous-variable quantum key distribution. We propose a novel estimation scheme which is based on the clusterization of the estimated transmittance data. We show that uncertainty about whether the transmittance is fixed or not results in a lower key rate. However, if the total number of measurements is large, one can obtain using our method a key rate similar to the non-fluctuating channel even for highly fluctuating channels. We also verify our theoretical assumptions using experimental data from an atmospheric quantum channel. Our method is therefore promising for secure quantum communication over strongly fluctuating turbulent atmospheric channels.
