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Optoelectronics Letters

Improved nonorthogonal decoy state method in quantum key distribution with a parametric down-conversion source

周媛媛, 周学军, 高俊

Published Jan 1, 2010• 0 citations
OpenAlex

Abstract

与参量的下面变换来源(PDCS ) 一起，基于一个，真空和二个弱圈套说的 nonorthogonal 圈套状态协议被介绍。察觉事件在上跳方面被划分成依靠艾莉斯是否得到一个扳机的二个组：触发的部件和 nontriggered 部件。触发的部件被用来估计部分和单个光子、二光子的脉搏，然后期末考试的错误率安全的关键率被推出。而且，被触发， nontriggered 部件被用来推出关键产生率的更精确的价值。在传播距离上的最后的关键产生率的模拟证明第一个方法能获得关键产生率结束到无限的圈套状态协议的理论限制，当第二个方法更好时。

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与参量的下面变换来源(PDCS ) 一起，基于一个，真空和二个弱圈套说的 nonorthogonal 圈套状态协议被介绍。察觉事件在上跳方面被划分成依靠艾莉斯是否得到一个扳机的二个组：触发的部件和 nontriggered 部件。触发的部件被用来估计部分和单个光子、二光子的脉搏，然后期末考试的错误率安全的关键率被推出。而且，被触发， nontriggered 部件被用来推出关键产生率的更精确的价值。在传播距离上的最后的关键产生率的模拟证明第一个方法能获得关键产生率结束到无限的圈套状态协议的理论限制，当第二个方法更好时。
在实际的量钥匙分发(QKD ) ，因为在传播的脉搏和严重损失衬里的多光子的存在，弱协调状态处于安全的关键率和传播距离作为光子来源有限制。圈套状态方法和 thenonorthogonal 编码协议是二个重要方法与这些效果作斗争。这里，我们两个都联合方法并且建议能实质地改进表演 ofQKD 的一个有效方法。我们在传播距离在 SARG04 协议的结果上用圈套状态方法和 123-kmincrease 在优先的记录上发现 78-km 增加。
In this paper, a new decoy state scheme for quantum key distribution with parametric down-conversion source is proposed. We use both three-intensity decoy states and their triggered and nontriggered components to estimate the fraction of single-photon counts and the quantum bit-error rate of single-photon pulses, and then deduce a more accurate value of the key generation rate. The final key rate over transmission distance is simulated, which shows that we can obtain a higher key rate than that of the existing methods, including our own earlier work.
A nonorthogonal passive decoy-state method is presented with a reconstructive weak coherent state source. The method dose not prepare decoy states actively and divides the receiver detection events into two groups, i.e., triggered components and nontriggered components, according to triggering situation of the sender detector. Both triggered and nontriggered components, as signal states and decoy states, are used to do some estimations and to generate secure key. The simulation results show that a better key generation rate and a longer secure transmission distance can be obtained with the nonorthogonal passive decoy-state method than with the existing passive methods, and that the performance is comparable to the theoretical limit of an active infinite decoy-state protocol. Furthermore, the nontriggered component contribution to key generation offsets the limitation of the detector low efficiency, and the performance of the method dose not depend on the detector efficiency of sender. Because decoy states need not be prepared actively, and our protocol is easy to implement and apply to quantum key distribution at high transmission rates.