High-speed implementation of privacy amplification for continuous-variable quantum-key distribution with Toeplitz matrix based on FPGA

Yujie Luo; Yang Li; Li Ma; Chuang Zhou; Jie Yang; Mei Wu; Shuai Zhang; Wei Huang; Bingjie Xu

doi:10.1117/12.2687079

26 November 2023 High-speed implementation of privacy amplification for continuous-variable quantum-key distribution with Toeplitz matrix based on FPGA

Yujie Luo, Yang Li, Li Ma, Chuang Zhou, Jie Yang, Mei Wu, Shuai Zhang, Wei Huang, Bingjie Xu

Author Affiliations +

Proceedings Volume 12775, Quantum and Nonlinear Optics X; 1277518 (2023) https://doi.org/10.1117/12.2687079
Event: SPIE/COS Photonics Asia, 2023, Beijing, China

Conference Poster

Abstract

For a high-speed and secure continuous-variable quantum key distribution (CV-QKD) system, privacy amplification (PA) plays an important role. To reduce the finite size effect, the input length of PA should be at least on the order of 10^8, 10^9, 10^10 when the transmission distance is about 50km, 80km, 100km, respectively. This leads to high computation complexity and large storage demand of the data, which is unfriendly to field programmable gate array (FPGA) implementation for its limited resource. In addition, the limited IO speed of Double Data Rate Synchronous Dynamic Random Access Memory (DDR SDRAM) restricts the implementation performance of PA. In this paper, we propose an effective way to access data based on DDR to improve the performance of PA. As a result, the reading time from DDR can be reduced, and it can eliminate the effect of the limited IO speed of DDR, so that PA can perform with multiple code-words. This can make full use of the resource of FPGA and increase the execution speed of PA. Besides, combining with the proposed method, an easier algorithm is used to decrease the complexity of calculations. Based on these methods, we realize PA with Toeplitz matrix based on FPGA and the experimental throughput is about 288Mbps when the input length is about 100Mbits.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Yujie Luo, Yang Li, Li Ma, Chuang Zhou, Jie Yang, Mei Wu, Shuai Zhang, Wei Huang, and Bingjie Xu "High-speed implementation of privacy amplification for continuous-variable quantum-key distribution with Toeplitz matrix based on FPGA", Proc. SPIE 12775, Quantum and Nonlinear Optics X, 1277518 (26 November 2023); https://doi.org/10.1117/12.2687079

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