Information Rates With Non Ideal Photon Detectors in Time-Entanglement Based QKD
Information Rates With Non Ideal Photon Detectors in Time-Entanglement Based QKD
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DOI：
10.1109/tcomm.2023.3244244
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发表时间：
2022-07
影响因子：
8.3
通讯作者：
D. Birnie;Christopher Cheng;E. Soljanin
中科院分区：
文献类型：
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作者：
D. Birnie;Christopher Cheng;E. Soljanin
我们开发了量化光子检测器缺陷对基于时间键的量子密钥分布（QKD）的秘密密钥速率的影响的新方法。最大可实现的秘密密钥速率不同。定时抖动，然后引入一个基于新颖的马尔可夫链（MC）模型来表征检测器停机的效果，并显示其如何将内存引入关键生成过程，我们提出了一种新的方法，将黑暗计数包括在分析中，该方法显示了显示的分析。当使用共同的脉冲位置调制（PPM）时，黑暗计数可能特别有害。使用PPM进行QKD时，我们的主要结果之一就是为实验者提供了工具，以预测其系统可实现的秘密关键率。
We develop new methods of quantifying the impact of photon detector imperfections on possible secret key rates in Time-Entanglement based Quantum Key Distribution (QKD). We address photon detection timing jitter, detector downtime, and dark photon counts and show how each may decrease the maximum achievable secret key rate differently. We begin with a standard Discrete Memoryless Channel (DMC) model to get a good bound on the mutual information lost due to the timing jitter, then introduce a novel Markov Chain (MC) based model to characterize the effect of detector downtime and show how it introduces memory to the key generation process. Finally, we propose a new method of including dark counts in the analysis that shows how dark counts can be especially detrimental when using the common Pulse Position Modulation (PPM) for key generation. Our results show that these three imperfections can significantly reduce the achievable secret key rate when using PPM for QKD. One of our main results is providing tooling for experimentalists to predict their systems’ achievable secret key rate given the detector specifications.