YAN Shiling, WANG Jindong, FANG Junbin, JIANG Lin, WANG Xuan. An Improved Polar Codes-Based Key Reconciliation for Practical Quantum Key Distribution[J]. Chinese Journal of Electronics, 2018, 27(2): 250-255. doi: 10.1049/cje.2017.07.006
Citation: YAN Shiling, WANG Jindong, FANG Junbin, JIANG Lin, WANG Xuan. An Improved Polar Codes-Based Key Reconciliation for Practical Quantum Key Distribution[J]. Chinese Journal of Electronics, 2018, 27(2): 250-255. doi: 10.1049/cje.2017.07.006

An Improved Polar Codes-Based Key Reconciliation for Practical Quantum Key Distribution

doi: 10.1049/cje.2017.07.006
Funds:  This work is supported by the National Natural Science Foundation of China (No.61401176, No.61401262, No.U1636106, No.61472048, No.61771205, No.61771222), the Natural Science Foundation of Guangdong Province, China (No.2014A030310205, No.2015A030313388), the Special Science and Technology Foundation of Guangdong Province, China (No.2016A010101017), the Project of Guangdong High Education (No.YQ2015018), the Application-oriented Special Scientific Research Foundation of Application Type of Guangdong Province, China (No.2015B010128012), the Key Technology Program of Shenzhen, China (No.JSGG20160427185010977), and Science and Technology Project of Guangzhou (No.201707010253).
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  • Corresponding author: FANG Junbin (corresponding author) is an associate professor with the Department of Optoelectronic Engineering, Jinan University and a visiting professor in the Edward S. Rogers Sr. Department of Electrical & Computer Engineering, University of Toronto, Canada. His research interests include quantum cryptography and visible light communication. (Email:tjunbinfang@jnu.edu.cn)
  • Received Date: 2017-03-01
  • Rev Recd Date: 2017-05-26
  • Publish Date: 2018-03-10
  • Key reconciliation is important for practical Quantum key distribution (QKD) systems since it corrects the error bits in a key string by sacrificing some key bits. Therefore, its performance directly affects the secret key rate of a practical QKD system. Although key reconciliation scheme based on polar codes can achieve a high coding efficiency, the high frame error rate causes discarding key strings and decreases the secret key rate. In this paper, we fist analyze the limitation of successive cancellation decoding of polar codes, and then we propose an improved key reconciliation scheme using polar codes with successive cancellation list decoding and optimized coding structures, which can decrease the frame error probability, resulting in a higher secret key rate. Numerical results show that the proposed scheme can achieve a 12.8% higher secret key rate than the previous polar codes-based scheme with a code length of 216 bits and a quantum bit error rate of 2%. Besides, the proposed scheme is robust and it can extract secret key bits even when the quantum bit error rate reaches 10.2% with a code length of 220 bits and a coding efficiency of 90.6%.
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