论文标题
提高基于能源纠缠的量子键分布的原始密钥速率
Increasing the Raw Key Rate in Energy-Time Entanglement Based Quantum Key Distribution
论文作者
论文摘要
量子密钥分布（QKD）协议描述了两个远程各方如何通过通过量子和公共经典渠道进行通信来建立一个秘密密钥，而这两者都可以由窃听者访问。使用能量时纠缠光子对的QKD协议具有越来越多的实际感兴趣，因为它们的潜力通过每件纠缠的光子对携带多个位在长距离内提供更高的安全键。我们考虑一个系统，可以通过测量一系列纠缠光子到达的随机时间来提取信息。我们的目标是最大化每对这样的双人的效用。我们为光子到达过程提出了一个离散的时间模型，并在此模型下可以生成的原始位数建立理论结合。我们首先分析了一种众所周知的简单封装编码方案，并表明它的信息速率明显低于理论上的信息率。然后，我们提出了三种自适应方案，以增加每个光子生成的原始位数，并计算和比较它们提供的信息率。此外，研究了公共渠道沟通对拟议方案的秘密关键率的影响。
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.
