论文标题
在模式不匹配下的多模型非高斯安全通信
Multimode non-Gaussian secure communication under mode-mismatch
论文作者
论文摘要
在本文中，我们在模式不匹配的情况下分析了非高斯性在连续变量（CV）量子键分布（QKD）中的作用。我们将基于纠缠的方案与两种模式挤压真空状态（TMSV）上的单光量填充和零量子催化产生的非高斯资源相关。我们的结果表明，与TMSV相比，这些非高斯资源也合理地增强了CV-QKD的性能，即使在模式不匹配引起的噪声效果下也是如此。具体而言，在TMSV的情况下，最大传输距离限制为47 km，但单光子减去TMSV和零量子型TMSV的TMSV分别产生了73 km和152 km的更高距离。然而，光子丢失是零光子催化设置的实际关注点，将零量子核量的TMSV的传输距离限制为36 km。这使得TMSV上的单光子提取是基于纠缠的CV-QKD获得较大传输距离的最佳选择。尽管如此，我们注意到非高斯性并不能改善基于纠缠的CV-QKD方案的鲁棒性，以防止检测效率低下。我们认为，我们的工作提供了实用的观点，即在现实条件下用多模灯实施CV-QKD。
In this paper, we analyse the role of non-Gaussianity in continuous-variable (CV) quantum key distribution (QKD) with multimode light under mode-mismatch. We consider entanglement-based protocol with non-Gaussian resources generated by single-photon-subtraction and zero-photon-catalysis on a two-mode squeezed vacuum state (TMSV). Our results indicate that, compared to the case of TMSV, these non-Gaussian resources reasonably enhances the performance of CV-QKD, even under the effect of noise arising due to mode-mismatch. To be specific, while in the case of TMSV the maximum transmission distance is limited to 47 Km, single-photon subtracted TMSV and zero-photon-catalysed TMSV yield much higher distance of 73 Km and 152 Km respectively. However, photon loss as a practical concern in zero-photon-catalysis setup limits the transmission distance for zero-photon-catalysed TMSV to 36 Km. This makes single-photon-subtraction on TMSV to be the best choice for entanglement-based CV-QKD in obtaining large transmission distance. Nonetheless, we note that the non-Gaussianity does not improve the robustness of entanglement-based CV-QKD scheme against detection inefficiency. We believe that our work provides a practical view of implementing CV-QKD with multimode light under realistic conditions.
