等时间间隔内光子数奇偶随机性的光量子随机源

提出一种基于等时间间隔内光子数奇偶随机性光量子随机源.将连续波激光二极管发射的光衰减成离散的单光子序列,利用雪崩光电二极管单光子探测模块来探测光子,通过测量等时间内探测到光子数的奇偶性来提取随机位.研制出了基于现场可编程门阵列的随机位提取电路,测试和分析了时间间隔大小和单光子计数模块的性能参量对所设计随机源提取随机数性能的影响.根据系统平均计数率自动设置时间间隔大小,实现了偏差小、速度快的随机位产生器.所设计随机源工作在计数率为20 Mcps,时间间隔设置为0.5 μs时,可获得2 Mbit/s的随机位产生速率.运用随机性检测包ENT和STS对所获得的随机位序列进行测试,表明序列的随机性满足真随机数标准,不需要后续处理.

Abstract

An optical quantum random number generator based on parity of the number of photons detected in the equal time intervals was proposed.Light emitted from a continuous wave laser diode is attenuated into discrete single-photon sequence.The single photon is detected by a single-photon avalanche photodiode module.Random bit is extracted by measuring the parity of number of photons detected in equal time interval.The random bit extraction circuit based on field programmable gate array was developed.The influences of the size of time interval and the performance parameters of single photon module on performance of the designed random number generator were analyzed.In order to achieve a random bit generator with small deviation and fast generation rate,a method of setting time interval automatically according to average counting rate was proposed.A random bit generation rate of 2 Mbit/s was obtained when the designed random number generator works on a counting rate of 20 Mcps and the equal time interval is set as 0.5 μs.The random bit sequences were tested by random number test program ENT and STS.The test results show that the generated random bit sequences fully meet the standards of true random numbers,and do not require post-processin

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鄢秋荣, 赵宝升, 张华, 廖庆洪, 陈荣伶. 等时间间隔内光子数奇偶随机性的光量子随机源[J]. 光子学报, 2015, 44(6): 0627003. YAN Qiu-rong, ZHAO Bao-sheng, ZHANG Hua, LIAO Qing-hong, CHEN Rong-ling. Optical Quantum Random Number Generator Based on Parity of the Number of Photons Detected in Equal Time Intervals[J]. ACTA PHOTONICA SINICA, 2015, 44(6): 0627003.

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