Increasing the Raw Key Rate in Energy-Time Entanglement Based Quantum Key Distribution
Increasing the Raw Key Rate in Energy-Time Entanglement Based Quantum Key Distribution
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DOI：
10.1109/ieeeconf51394.2020.9443428
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发表时间：
2020-01
期刊：
影响因子：
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通讯作者：
Esmaeil Karimi;E. Soljanin;Phil Whiting
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文献类型：
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作者：
Esmaeil Karimi;E. Soljanin;Phil Whiting
量子密钥分发（QKD）协议描述了两个远程方如何通过在量子和公共经典信道上通信来建立秘密密钥，这两个信道都可以被窃听者访问。利用能量-时间纠缠光子对的量子密钥分发协议越来越受到人们的实际关注，因为它们有可能通过每个纠缠光子对携带多个比特来在长距离上提供更高的安全密钥速率。我们考虑一个系统，其中信息可以通过测量纠缠光子到达序列的随机时间来提取。我们的目标是最大化每一对的效用。我们提出了一个离散时间模型的光子到达过程中，并建立了一个理论上的界限，可以在这个模型下产生的原始比特的数量。我们首先分析了一个众所周知的简单的装箱编码方案，并表明，它产生显着较低的信息速率比理论上可能的。然后，我们提出了三种自适应方案，增加每个光子生成的原始比特数，并计算和比较它们提供的信息速率。此外，研究了公共信道通信对所提方案密钥速率的影响。
A Quantum Key Distribution (QKD) protocol describes how two remote parties can establish a secret key by communicating over a quantum and a public classical channel that both can be accessed by an eavesdropper. QKD protocols using energy-time entangled photon pairs are of growing practical interest because of their potential to provide a higher secure key rate over long distances by carrying multiple bits per entangled photon pair. We consider a system where information can be extracted by measuring random times of a sequence of entangled photon arrivals. Our goal is to maximize the utility of each such pair. We propose a discrete time model for the photon arrival process, and establish a theoretical bound on the number of raw bits that can be generated under this model. We first analyse a well known simple binning encoding scheme, and show that it generates significantly lower information rate than what is theoretically possible. We then propose three adaptive schemes that increase the number of raw bits generated per photon, and compute and compare the information rates they offer. Moreover, the effect of public channel communication on the secret key rates of the proposed schemes is investigated.