Research On Quantum Random Number Generation Based On Fiber Integrated Diamond NV Color Centers Single Photon Source

A crucial property of quantum random numbers is strict randomness,which can be used in quantum computing,quantum measurement,quantum network,quantum communication and other fields.The classical quantum random number generator uses attenuated laser pulses as the excitation light source,which is difficult to have high photon count rate and excellent single-photon characteristics at the same time,and requires extremely complex data processing in the process of obtaining random numbers.In the paper,a quantum random number generation method based on optical fiber integrated diamond NV color center single photon source is proposed.On the basis of using laser confocal scanning platform for positioning,the large objective lens is replaced by optical fiber integrated device.In the device,the parabolic lens is used to collect the fluorescence emitted by diamond samples.Compared with the fluorescence collection using the objective lens,the efficiency increased by 20%.The laser confocal scanning and positioning system based on fiber integration was used to detect the diamond samples,and the diamond Nitrogen-Vacancy(NV)color center crystal single photon source was excited.The saturation brightness of the single photon source was 1.5 Mcounts/s.The zero-delay second-order correlation function is 0.48(less than the standard limit of 0.5).The entropy source of the quantum random number generation system is the result of the channel random selection when the single photon source passes through the fiber beam splitter.The fluorescence emitted by the diamond NV color center after excitation is detected by the single-photon detector,and then the random number can be collected by the time digital converter.The proposed quantum random number generation method adopts semi-self-detection scheme,and the generation rate of unbiased random number generated by this method is about 350 k Hz.The unbiased random number sequence is detected by the NIST program package,and the pass rate of each test is over 98%.The conditional minimum entropy of the generated unbiased random number sequence is about 2.04 per bit,which indicates that the generated unbiased random number sequence has high randomness.At the same time.In the process of scanning the sample,there is no need to adjust the working distance of the objective lens repeatedly,which reduces the operation difficulty of the system.The cost of the measurement system is also reduced.The average price of the objective lens meeting the experimental conditions is more than20,000 yuan,while the total price of the optical fiber integrated device used in this scheme is only less than 5,000 yuan,which is the main innovation point of the paper.The main content of the paper is as follows.In the first paragraph,a brief overview of the background,classification and significance of quantum random number generator is given.Combined with the research status of quantum random number generator,to further improve the efficiency of quantum random number generator,a quantum random number generation scheme based on fiberintegrated diamond NV color center single-photon source is proposed.In the second paragraph,the overall scheme of quantum random number generator is analyzed and designed.Firstly,the principle of quantum random number generator is introduced;secondly,the basic properties of diamond NV color center are introduced,.Finally,the detailed design scheme of the system is proposed according to the above principle combined with the advantages of fiber integration method.In the third paragraph,the key parts in the realization of the quantum random number generator are tested and verified.Firstly,the performance of the single-photon source of diamond NV color center is studied,including the scanning positioning of the singlephoton source and the verification of the characteristics of the single-photon source;then the Hanbury-Brown-Twiss(HBT)device is described in detail and the second-order correlation functions are calculated and analyzed.In the fourth paragraph,the whole quantum random number generator is discussed,and the comprehensive test verification is completed.Firstly,the principle of random number generation is introduced,and then the random numbers collected by the experiment are post-processed and analyzed.Then,the NIST statistical testing program is used to test the randomness of the random number sequence and evaluate the performance of a quantum random number generation method from a single photon source.In the final paragraph,the research work completed in the paper is summarized,and the next research direction is prospected.