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Efficient Quantum Key Distribution based on Pulse-Position Modulation

机译:基于脉冲位置调制的高效量子密钥分配

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摘要

Pulse-position modulation (PPM) is a promising technique that can be used to improve the efficiency of quantum key distribution (QKD) based on a Poisson photon source. In this paper, we first investigate a simple entanglement-and-PPM-based QKD protocol and demonstrate the improvement in secret key rate. However, such a PPM-based QKD protocol that utilizes only frames with a single click is still inefficient because it ignores frames with two and more clicks. For this reason we propose to use such multi-click frames to further improve the efficiency of PPM-based QKD by employing a better sifting strategy. Specifically, we focus on using the frames with two clicks in addition to those with a single click. Finally, we analyze the secret key rate under various noise levels in the scenario of high channel loss, which has been faced by most QKD applications. With the analytical results, we show the advantage of the proposed PPM-based QKD.
机译:脉冲位置调制(PPM)是一种很有前途的技术,可用于提高基于泊松光子源的量子密钥分配(QKD)的效率。在本文中,我们首先研究了一个基于纠缠和PPM的简单QKD协议,并证明了秘密密钥率的提高。但是,这种仅使用单击一次即可使用帧的基于PPM的QKD协议仍然效率不高,因为它会忽略单击两次以上的帧。因此,我们建议使用这种多点击框架,以通过采用更好的筛选策略来进一步提高基于PPM的QKD的效率。具体来说,我们重点关注使用单击两次的框架。最后,我们分析了大多数QKD应用面临的高信道丢失情况下各种噪声水平下的秘密密钥速率。通过分析结果,我们证明了所提出的基于PPM的QKD的优势。

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