High-speed implementation of privacy amplification for continuous-variable quantum key distribution

Yujie Luo; Yang Li; Jie Yang; Li Ma; Wei Huang; Bingjie Xu

doi:10.1117/12.2574969

10 October 2020 High-speed implementation of privacy amplification for continuous-variable quantum key distribution

Yujie Luo, Yang Li, Jie Yang, Li Ma, Wei Huang, Bingjie Xu

Proceedings Volume 11558, Quantum and Nonlinear Optics VII; 115580K (2020) https://doi.org/10.1117/12.2574969
Event: SPIE/COS Photonics Asia, 2020, Online Only

Abstract

Privacy amplification (PA) is an essential process for high-speed and real-time implementation of a continuous-variable quantum key distribution (CV-QKD) system. This work focuses on the improvement of the performance of PA, and we realize PA with Toeplitz matrix and accelerate it using fast Fourier transform (FFT) on graphic processing unit (GPU). Based on the architectural feature of FFT, we adjust its form of input length and obtained an average speed of PA about 2Gbps with input length ranges from 1Mbits to 128Mbits, which is length-adaptable to satisfy various requirements of CV-QKD systems at different transmission distances. Furthermore, we test this work with different compress ratios of PA, which can also achieve a high implementation speed around 2Gbps. With the method used in this paper, the requirements of PA for the high-speed and real-time CV-QKD system can be entirely satisfied.

Conference Presentation

Citation Download Citation

Yujie Luo, Yang Li, Jie Yang, Li Ma, Wei Huang, and Bingjie Xu "High-speed implementation of privacy amplification for continuous-variable quantum key distribution", Proc. SPIE 11558, Quantum and Nonlinear Optics VII, 115580K (10 October 2020); https://doi.org/10.1117/12.2574969

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