Research On Key Technologies Of Data Acquisition For The Quantum Random Number Generator Based On Vacuum Fluctuation

Random numbers have been widely applied in information encryption,statistical sampling,and other applications.With the development of quantum technology,more efforts have been dedicated to the research of quantum random sources,including those based on spontaneous radiation noise,vacuum fluctuations,and phase noise.The process of extracting random numbers from quantum random sources is called quantum random number generator.The quantum random number generator based on vacuum fluctuations has many advantages:the source can be easily prepared with simple implementations,its compatibility with integrated photonic chips makes it more suitable for the needs of high-speed application scenarios.Therefore,compared to other schemes,the quantum random number generator based on vacuum fluctuations is preferable to the researchers.Data acquisition is one key technology in the vacuum state quantum random number generator which converts the electrical signals obtained from the detection to digital signals for analysis and processing.In order to achieve a safe,stable,and high-speed vacuum state quantum random number generator,a high-performance data acquisition system is needed.The main parameters of the data acquisition system are the sampling rate,the number of sampling bits and the dynamic range.These three parameters will directly affect the randomness of the random sequence and production rate.This paper designs a high-speed data acquisition scheme applied to the vacuum state quantum random number generator.The specific contents are as follows:1.By analyzing the correlation between the sampling data and the minimum entropy in the worst case of the practical system,the sampling rate,sampling bits and the dynamic range of the data acquisition system are determined.The data acquisition system consists of a sampling card and a data processing module based on an FPGA development platform.The sampling card is based on the ADC chip of ADS5400.2.Testing of the data acquisition system.In the case where the test signal frequency is 50 MHz and the sampling frequency is 800 MHz,the effective number of bits of the system reaches 9.20 bits.At the same time,an experimental system base on the vacuum random quantum random number generator is built where the random variable is sampled using the data acquisition system.Finally,the overall performance test of the vacuum state quantum random number generator is tested.This paper designs and implements a high-speed data acquisition scheme that can be applied to the vacuum quantum random number generator.The raw random sequence generation rate of this scheme can reach 9.60 Gbps,and after being post-processed with random extraction rate of 0.533,the random sequence generation rate is as high as 5.12 Gbps.