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Chinese Physics Letters

Decoy State Quantum Key Distribution with Odd Coherent State

孙仕海, 高明, 戴宏毅, 陈平形, 李承祖

Published Jan 1, 2008• 0 citations
OpenAlex

Abstract

我们建议有跟随 sub-Poissonian 的奇怪的协调状态的一个圈套状态量钥匙分发计划散布了光子计数并且在每脉搏有多光子事件和真空事件的低概率。数字计算证明我们的计划能高效地改进关键产生率和安全通讯距离。而且，一个仅仅圈套状态是必要的在我们的计划，而是至少二个圈套与无限的圈套状态来临到完美的 asymptotic 限制状态在另外的计划被需要。

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我们建议有跟随 sub-Poissonian 的奇怪的协调状态的一个圈套状态量钥匙分发计划散布了光子计数并且在每脉搏有多光子事件和真空事件的低概率。数字计算证明我们的计划能高效地改进关键产生率和安全通讯距离。而且，一个仅仅圈套状态是必要的在我们的计划，而是至少二个圈套与无限的圈套状态来临到完美的 asymptotic 限制状态在另外的计划被需要。
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。
We propose a decoy state quantum key distribution scheme with odd coherent state which follows sub-Poissonian distributed photon count and has low probability of the multi-photon event and vacuum event in each pulse. The numerical calculations show that our scheme can improve efficiently the key generation rate and secure communication distance. Furthermore, only one decoy state is necessary to approach to the perfect asymptotic limit with infinite decoy states in our scheme, but at least two decoy states are needed in other scheme.
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。
Recently, a novel quantum-key-distribution (QKD) protocol, called Round-robin-differential-phase-shift (RRDPS) QKD, has been proposed to share a secure key without monitoring the signal disturbance. In this paper, we propose a decoy state RRDPS-QKD protocol with odd coherent states (OCS). We implement a one-intensity decoy state method into the RRDPS-QKD with OCS to estimate the key rate. The results show that both the maximum transmission distance and the key rate of our protocol are significantly improved. Moreover, only one-intensity decoy state is sufficient for the protocol to approach the asymptotic limit with infinite decoy states.