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In a quantum key distribution(QKD)system,the error rate needs to be estimated for determining the joint probability distribution between legitimate parties,and for improving the performance of key reconciliation.We propose an efficient error estimation scheme for QKD,which is called parity comparison method(PCM).In the proposed method,the parity of a group of sifted keys is practically analysed to estimate the quantum bit error rate instead of using the traditional key sampling.From the simulation results,the proposed method evidently improves the accuracy and decreases revealed information in most realistic application situations. 相似文献
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Recently,self-sustained oscillatory genetic regulatory networks(GRNs) have attracted significant attention in the biological field.Given a GRN,it is important to anticipate whether the network could generate oscillation with proper parameters,and what the key ingredients for the oscillation are.In this paper the ranges of some function-related parameters which are favorable to sustained oscillations are considered.In particular,some oscillatory motifs appearing with high-frequency in most of the oscillatory GRNs are observed.Moreover,there are some anti-oscillatory motifs which have a strong oscillation repressing effect.Some conclusions analyzing these motif effects and constructing oscillatory GRNs are provided. 相似文献
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Internal cancellation of spikes using two avalanche photodiodes in series for single photon detection 下载免费PDF全文
<正>We propose a method of improving the performance of InGaAs/InP avalanche photodiodes by using two avalanche photodiodes in series as single photon detectors for 1550-nm wavelength.In this method,the raw single photon avalanche signals are not attenuated,thus a high signal-to-noise ratio can be obtained compared with the existing results.The performance of the scheme is investigated and the ratio of the dark count rate to the detection efficiency is obtained to be 1.3×10~(-4) at 213 K. 相似文献
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This paper develops a QKD (quantum key distribution)-based queueing
model to investigate the data delay on QKD link and network,
especially that based on trusted relays. It shows the mean
packet delay performance of the QKD system. Furthermore, it proposes a
key buffering policy which could effectively improve the delay
performance in practice. The results will be helpful for quality of
service in practical QKD systems. 相似文献
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Using InGaAs/InP avalanche photodiodes as sensors and coaxial cables as reflection lines to reject spike signals, we have firstly employed the "timing filtering" gates to pick out avalanche signals and have realized the single photon detection at 1550nm in the temperature range of thermoelectric cooling. A ratio of the dark count rate to the detection efficiency was obtained to be 9 × 10^-5 at 223K. When the detector is applied to a practical quantum key distribution system, the transmission distance can reach 89.5km and the repetition rate can reach 0.33 MHz. 相似文献
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测量设备无关量子密钥分发协议可以免疫所有测量端的漏洞,极大地推进量子保密通信的实用化进程。美中不足的是,该协议依然对源端有极强的安全性假设。源端设备的非完美性同样会留下多种侧信道,从而威胁系统的实际安全性。针对此问题,提出无特征源测量设备无关量子密钥分发协议。该协议在量子态制备不完美的情况下依然可以提取出安全的密钥,是理论无条件安全性与实际安全性的完美结合。通过三强度诱骗态方法以及自行研制的Sagnac-Asymmetric-Mach-Zehnder编码结构,成功搭建无特征源的测量设备无关量子密钥分发系统,并在长为50.4 km的光纤信道和25 MHz的系统重复频率下达到1.91×10-6的安全密钥分发速率。 相似文献
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对冲击波法合成的纳米纤锌矿氮化硼(wBN)进行了同步辐射真空紫外区的反射光谱测量,得到波长范围100一240nm区间的反射光谱.利用Kramers-Kronig关系计算获得了它的光学常数和介电函数谱,并导出了光电导谱.获得了纳米wBN的光学禁带宽度实验值,为8.7±0.5eV.将以上结果和最新的理论计算进行了比较.观察到了经不同退火温度处理的纳米wBN样品结构及尺寸变化对反射光谱和光学性质的影响.
关键词: 相似文献
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