|
|||||
|
|
| 量子密钥分配系统中的通信速率和误码率 | |
| 引用本文： | 焦荣珍,冯晨旭,唐少杰.量子密钥分配系统中的通信速率和误码率[J].光学学报,2008,28(s2):167-169. |
| 作者姓名： | 焦荣珍 冯晨旭 唐少杰 |
| 作者单位： | 焦荣珍:北京邮电大学理学院, 北京 100876 冯晨旭:北京邮电大学理学院, 北京 100876 唐少杰:北京邮电大学理学院, 北京 100876 |
| 基金项目： | 北京市共建基金(XK100130837)资助项目。 |
| 摘 要： | 基于通信速率和误码率在量子保密通信研究中的重要性, 采用1.55 μm上转换单光子探测器, 分析其量子效率随抽运功率的变化关系, 得出1.55 μm上转换单光子探测器较传统的铟镓砷二极管具有较高的量子效率和较低暗计数的优势, 并根据通信距离、上转换单光子探测器的量子效率和暗计数之间建立一种平衡, 得出每种距离上探测器的优化方案; 在考虑个体攻击无量子记忆的条件下, 比较BB84协议, BBM92协议和差分相移协议的量子密钥分配(QKD)系统的安全通信速率和误码率随通信距离的变化关系, 得出了差分相移键控协议的量子密钥分配系统是一个非常实用的, 通信距离大于200 km的很有吸引力的长距离量子密钥分配系统。 |
| 关 键 词： | 量子光学 单光子探测器 通信速率 误码率 |
Communication Rate and Error Rate in the Quantum-Key-Distribution System |
|
| Abstract: | The performance of various quantum-key-distribution systems is analyzed using 1.55-μm up-conversion single-photon detector. Important parameters such as communication rate, error rate, quantum efficiency and dark count rate are discussed. It is shown that quantum efficiency depends on the pump power, and that 1.55-μm up-conversion single-photon detector has great advantage over the InGaAs avalanche photodiodes detector. The analysis is based on the secure communication rate and error rate as a function of distance for three quantum-key-distribution(QKD) protocols: the Bennett-Brassard 1984, the Bennett-Brassard-Mermin 1992, and the differential-phase-shift-keying protocols. We consider that the secure communication rate of the three protocols against an arbitrary individual attack, including the most commonly considered intercept-resend and photon-number splitting attacks, and concluded that the simple and efficient differential-phase-shift-keying protocol allows for more than 200 km of secure communication distance with high communication rate. |
| Keywords: | quantum optics single-photon detector communication rate error rate |
