Improved information reconciliation with systematic polar codes for continuous variable quantum key distribution

• Published in: Quantum information processing Vol. 20; no. 10
• Main Authors: Zhang, Meixiang, Dou, Yin, Huang, Yuting, Jiang, Xue-Qin, Feng, Yan
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.10.2021; Springer Nature B.V
• Subjects: Channel noise; Continuity (mathematics); Data Structures and Information Theory; Eavesdropping; Mathematical Physics; Physics; Physics and Astronomy; Quantum Computing; Quantum cryptography; Quantum Information Technology; Quantum Physics; Reconciliation; Signal to noise ratio; Spintronics; Adaptive reconciliation; Systematic polar codes; Multidimensional reconciliation; CV-QKD
• ISSN: 1570-0755; 1573-1332
• DOI: 10.1007/s11128-021-03265-z

Quantum key distribution (QKD) enables two authenticated parties to share secret key and can detect any attack that attempts to eavesdrop on the key. Information reconciliation is an important part of QKD. The secret key between two communication parties can be extracted by correcting errors caused by quantum channel noise. To improve the efficiency of information reconciliation and secret key rate, this paper proposes an improved multidimensional information reconciliation protocol based on systematic polar codes. Moreover, we have demonstrated and analyzed the security of the proposed protocol. Simulation results show that the proposed protocol achieves the reconciliation efficiency of around 97% in a wider range of signal-to-noise ratio range 0 , 0.18 and a quite low frame error rate ( P e < 0.001 ). As a result, the improved multidimensional information reconciliation protocol based on the systematic polar codes can achieve a longer quantum communication transmission distance.