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Optoelectronics Letters

SARG04 decoy-state quantum key distribution based on an unstable source

周媛媛, 周学军

Published Jan 1, 2011• 0 citations
OpenAlex

Abstract

为 SARG04 圈套状态量钥匙分发(QKD ) 的一个三状态的协议基于不稳定的来源被介绍。没有使用原来的圈套状态想法的基本假设，到安全关键产生率的更低的界限被导出。与不稳定的参量的下面变换来源一起的三状态的 SARG04 圈套状态协议在模拟被考虑。在与不稳定的来源一起的这份报纸的协议给关键产生率那的模拟结果表演与稳定的来源一起接近那，并且当传播距离长时，仅仅细微的优点由使用稳定的来源出现。与不稳定的来源一起的 SARG04 圈套状态协议能仍然因此用一把稍微弄短的最后的钥匙获得无条件的安全。

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为 SARG04 圈套状态量钥匙分发(QKD ) 的一个三状态的协议基于不稳定的来源被介绍。没有使用原来的圈套状态想法的基本假设，到安全关键产生率的更低的界限被导出。与不稳定的参量的下面变换来源一起的三状态的 SARG04 圈套状态协议在模拟被考虑。在与不稳定的来源一起的这份报纸的协议给关键产生率那的模拟结果表演与稳定的来源一起接近那，并且当传播距离长时，仅仅细微的优点由使用稳定的来源出现。与不稳定的来源一起的 SARG04 圈套状态协议能仍然因此用一把稍微弄短的最后的钥匙获得无条件的安全。
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。
We have presented a method to estimate parameters of the decoy state protocol based on one decoy state protocol for both BB84 and SARG04. This method can give different lower bound of the fraction of single-photon counts (y1), the fraction of two-photon counts (y2), the upper bound QBER of single-photon pulses (e1), the upper bound QBER of two-photon pulses (e2), and the lower bound of key generation rate for both BB84 and SARG04. The effects of statistical fluctuations on some parameters of our QKD system have been presented. We have also performed the optimization on the choice of intensities and percentages of signal state and decoy states which give out the maximum distance and the optimization of the key generation rate. The numerical simulation has shown that the fiber based QKD and free space QKD systems using the proposed method for BB84 are able to achieve both a higher secret key rate and greater secure distance than that of SARG04. Also, it is shown that bidirectional ground to satellite and inter-satellite communications are possible with our protocol. The experiment of decoy state QKD has been demonstrated using ID-3000 commercial QKD system based on a standard ‘Plug & Play’ set-up. One decoy state QKD has been implemented for both BB84 and SARG04 over different transmission distance of standard telecom fiber.
Decoy states have recently been proposed as a useful method for substantially improving the performance of quantum key distribution (QKD). Considering the Scarani-Acin-Ribordy-Gisin protocol (SARG04) with a heralded single photon source (HSPS), we review the general model of HSPS QKD system with a threshold detector, and analyze the SARG04 non-decoy-state protocol, SARG04 infinite active decoy-state protocol and SARG04 decoy-state protocol combining active decoy state method and passive decoy state method. Furthermore, we discuss the choice of optimal signal intensity for HSPS QKD with and without decoy states and obtain the condition that the optimal signal intensity satisfies. The simulation and analysis results show that the decoy state method can substantially improve the performance of SARG04 protocol with HSPS and the performance of SARG04 protocol with HSPS is better than that of BB84 protocol with HSPS. The decoy state method weakens the dependence of the optimal signal intensity on the overall transmission probability.
Based on the heralded single photon source (HSPS),the non-orthogonal (SARG04) decoy stateprotocol with one vacuum and two weak decoy states was deduced.Combining the two weak decoy statesin the above protocols,a simple protocol with one vacuum and one weak decoy state was presented for eas-ier implementation.Combining the passive decoy state method with the active decoy state method in theabove protocols,the non-trigger detection events on Bob's side were not discarded but were used to esti-mate the fractions and the quantum bit error rates (QBER) of single-photon and two-photon pulse and togenerate the secure key.The simulation results show that the key generation rate of quantum key distribu-tion (QKD) is increased by the passive decoy idea,that the key generation rate is close to the theoreticallimit of infinite decoy state protocol.Under the same implementation condition,the transmission distanceis longer and the key generation rate of QKD for SARG04 is higher than that of QKD for BB84.