Research Of Intergrated Quantum Random Number Generator

Quantum information is an interdisciplinary subject combining quantum physics and information science,which mainly includes quantum communication,quantum computation and quantum metrology.Such as quantum communication is the only theoretically proven to be unconditionally secure so far.In quantum communication system,a large number of random number resources are needed,and the quality of random number is related to the security of the communication system.Quantum random number generator(QRNG)is a system that generates true random numbers guaranteed by quantum physics.The random numbers generated by QRNG are unpredictable,irreproducible and unbiased.So far,the two most important considerations highly desired for QRNG system are practicability and security in applications.This thesis mainly summarizes the author's work,mainly focusing on the realization of practical and safe QRNG,as well as demonstrating the serial applications of QRNG in quantum nonlocality.In the realization of practical QRNG,features of high speed,integration,low cost and high stability are the key requirements.We realize the integrated quantum random number based on the vacuum state.The photonic integrated circuit,InGaAs homodyne detector and high-bandwidth transimpedance amplifier into a single chip,which can exhibit the excellent characteristics of integration and high-frequency response.combining the optimization of post-processing process,we realized the fastest miniaturized QRNG with a record real-time output rate as high as 18.8 Gbps so far.This work provides a solution for ultra-fast and compact QRNG applications.On this basis,by further integrating the light source,the QRNG optical chip is realized,and for different application scenarios,miniaturized high-speed QRNG module and low cost and low power QRNG chip are developed respectively.In order to avoid the security risk caused by device imperfection,semi-device-independent(semi-DI)QRNG scheme is demonstrated.Considering both security and practicability,we realize a fast semi-DI QRNG based on continuous variables.Several applications of quantum random number in quantum nonlocality are introduced.Diffrent real-time QRNG systems with high speed and low latency are designed,which can meet the space-like separation conditions of different experimental schemes.It has been applied in the experimental of quantum non-bilocality,device-independent(DI)QRNG and DI randomness expansion.Furthermore,we realize a random number generator based on cosmic stars and use it in loophole-free Bell test experiments.