Practical security of continuous-variable quantum key distribution under finite-dimensional effect of multi-dimensional reconciliation

• 来源期刊: 中国物理B（英文版）
• 关键词: multi-dimensional reconciliation finite-dimensional effect continuous-variable quantum key distribution
• 年，卷（期）: 2018,（5）
• 页码范围: 101-107
• 页数: 7页
• 语种: 英文
• DOI: 10.1088/1674-1056/27/5/050301

摘要

The well-known multi-dimensional reconciliation is an effective method used in the continuous-variable quantum key distribution in the long-distance and the low signal-to-noise-ratio scenarios.The virtual channel employed to exchange data is generally established by using a finite-dimensional rotation in the reconciliation procedure.In this paper,we found that the finite dimension of the multi-dimensional reconciliation inevitably leads to the mismatch of the signal-to-noise-ratio between the quantum channel and the virtual channel,which may be called the finite-dimension effect.Such an effect results in an overestimation on the secret key rate,and subsequently induces vital practical security loopholes.