Experimental demonstration of 5 GBaud four-state continuous-variable quantum key distribution with digital signal processing

Heng Wang; Yan Pan; Yaodi Pi; Yun Shao; Ting Ye; Yang Li; Li Ma; Tao Zhang; Jinlu Liu; Wei Huang; Bingjie Xu

doi:10.1117/12.2643932

3 January 2023 Experimental demonstration of 5 GBaud four-state continuous-variable quantum key distribution with digital signal processing

Heng Wang, Yan Pan, Yaodi Pi, Yun Shao, Ting Ye, Yang Li, Li Ma, Tao Zhang, Jinlu Liu, Wei Huang, Bingjie Xu

Author Affiliations +

Proceedings Volume 12323, Quantum and Nonlinear Optics IX; 123230C (2023) https://doi.org/10.1117/12.2643932
Event: SPIE/COS Photonics Asia, 2022, Online Only

Conference Poster

Abstract

In this paper, we experimentally demonstrate a 5 GBaud four-state continuous-variable quantum key distribution with digital signal processing. By employing a frequency- and polarization-multiplexing quantum key transceiver, the modulation noise and DAC quantization noise in quantum state preparation, the photo-leakage noise in co-fiber transmission, the detection noise and ADC quantization noise in polarization diversity detection can be effectively reduced for achieving an ultra-low level of excess noise. Moreover, the main polarization variation and phase noise can be accurately compensated by designing a precise digital compensation scheme including the pilot-assisted polarization and phase compensation algorithm and the data-assisted equalized compensation algorithm. Besides, the explicit asymptotic secure key rate is evaluated by using an improved semidefinite programming security analysis method, which achieves a 100 Mbps level of secure key rate within 10 km distance.

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Heng Wang, Yan Pan, Yaodi Pi, Yun Shao, Ting Ye, Yang Li, Li Ma, Tao Zhang, Jinlu Liu, Wei Huang, and Bingjie Xu "Experimental demonstration of 5 GBaud four-state continuous-variable quantum key distribution with digital signal processing", Proc. SPIE 12323, Quantum and Nonlinear Optics IX, 123230C (3 January 2023); https://doi.org/10.1117/12.2643932

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