| Reconciliation for CV-QKD using globally-coupled LDPC codes |
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| 作者姓名： | 石金晶 李伯鹏 黄端 |
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| 作者单位： | School of Computer Science and Engineering |
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| 基金项目： | Project supported by the National Natural Science Foundation of China(Grant Nos.61801522,61972418,and 61872390);the Natural Science Foundation of Hunan Province,China(Grant Nos.2019JJ40352 and 2017JJ3415);the Special Foundation for Distinguished Young Scientists of Changsha City,China(Grant No.kq1905058)。 |
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| 摘 要： | Reconciliation is a necessary step in postprocessing of continuous-variable quantum key distribution(CV-QKD)system.We use globally coupled low-density parity-check(GC-LDPC)codes in reconciliation to extract a precise secret key from the raw keys over the authenticated classical public channel between two users.GC-LDPC codes have excellent performance over both the additive Gaussian white noise and binary-erasure channels.The reconciliation based on GC-LDPC codes can improve the reconciliation efficiency to 95.42% and reduce the frame error rate to 3.25×10^-3.Using distillation,the decoding speed can achieve 23.8 Mbits/s and decrease the cost of memory.Given decoding speed and low memory usage,this makes the proposed reconciliation method viable approach for high-speed CV-QKD system.
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| 关 键 词： | continuous-variable quantum key distribution globally COUPLED LOW-DENSITY parity-check RECONCILIATION efficiency frame error rate |
Reconciliation for CV-QKD using globally-coupled LDPC codes |
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| Jin-Jing Shi,Bo-Peng Li,Duan Huang.Reconciliation for CV-QKD using globally-coupled LDPC codes[J].Chinese Physics B,2020(4):139-145. |
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| Authors: | Jin-Jing Shi Bo-Peng Li Duan Huang |
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| Affiliation: | (School of Computer Science and Engineering,Central South University,Changsha 410083,China) |
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