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High-efficiency Gaussian key reconciliation in continuous variable quantum key distribution

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Abstract

Efficient reconciliation is a crucial step in continuous variable quantum key distribution. The progressive-edge-growth (PEG) algorithm is an efficient method to construct relatively short block length low-density parity-check (LDPC) codes. The qua-sicyclic construction method can extend short block length codes and further eliminate the shortest cycle. In this paper, by combining the PEG algorithm and qua-si-cyclic construction method, we design long block length irregular LDPC codes with high error-correcting capacity. Based on these LDPC codes, we achieve high-efficiency Gaussian key reconciliation with slice recon-ciliation based on multilevel coding/multistage decoding with an efficiency of 93.7%.

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Authors and Affiliations

  1. State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan, 030006, China

    ZengLiang Bai, XuYang Wang, ShenShen Yang & YongMin Li

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  1. ZengLiang Bai
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  2. XuYang Wang
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  3. ShenShen Yang
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  4. YongMin Li
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Correspondence to YongMin Li.

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Bai, Z., Wang, X., Yang, S. et al. High-efficiency Gaussian key reconciliation in continuous variable quantum key distribution. Sci. China Phys. Mech. Astron. 59, 614201 (2016). https://doi.org/10.1007/s11433-015-5702-7

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