Security analysis and improvement of source independent quantum random number generators with imperfect devices

Xing Lin; Shuang Wang; Zhen-Qiang Yin; Guanjie Fanyuan; Rong Wang; Wei Chen; Deyong He; Zheng Zhou; Guang-Can Guo; Zheng-Fu Han

doi:10.1117/12.2600670

9 October 2021 Security analysis and improvement of source independent quantum random number generators with imperfect devices

Xing Lin, Shuang Wang, Zhen-Qiang Yin, Guanjie Fanyuan, Rong Wang, Wei Chen, Deyong He, Zheng Zhou, Guang-Can Guo, Zheng-Fu Han

Author Affiliations +

Proceedings Volume 11905, Quantum and Nonlinear Optics VIII; 119050Y (2021) https://doi.org/10.1117/12.2600670
Event: SPIE/COS Photonics Asia, 2021, Nantong, JS, China

Conference Poster

Abstract

Recently, a source-independent quantum random number generator (SI-QRNG), which can generate secure random numbers with untrusted sources, has been realized. However, the measurement loopholes of the trusted but imperfect devices used in SI-QRNGs have not yet been fully explored. Here, we point out and evaluate the security loopholes of practical imperfect measurement devices in SI-QRNGs. We also provide corresponding countermeasures to prevent these information leakages by recalculating the conditional minimum entropy and adding a monitor. Furthermore, by taking into account the finite-size effect, we show that the influence of the afterpulse can exceed that of the finite-size effect with the large number of sampled rounds. Our protocol is simple and effective, and it promotes the security of SI-QRNG in practice as well as the compatibility with high-speed measurement evices, thus paving the way for constructing ultrafast and security-certified commercial SI-QRNG systems.

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Xing Lin, Shuang Wang, Zhen-Qiang Yin, Guanjie Fanyuan, Rong Wang, Wei Chen, Deyong He, Zheng Zhou, Guang-Can Guo, and Zheng-Fu Han "Security analysis and improvement of source independent quantum random number generators with imperfect devices", Proc. SPIE 11905, Quantum and Nonlinear Optics VIII, 119050Y (9 October 2021); https://doi.org/10.1117/12.2600670

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