Analysis of measurement-device-independent quantum key distribution under asymmetric channel transmittance efficiency

作者：Dong Chen^*; Zhao Shang-Hong; Zhao Wei-Hu; Shi Lei; Zhao Gu-Hao

来源：Quantum Information Processing, 2014, 13(11): 2525-2534.

DOI：10.1007/s11128-014-0806-y

• Decoy state
• Measurement-device-independent quantum key distribution
• Asymmetric channel transmittance efficiency

Measurement-device-independent quantum key distribution (MDI-QKD) is immune to all the detection attacks. Based on decoy-state method, MDI-QKD can be implemented with nonperfect single-photon sources. In this paper, the performance of three-intensity decoy-state MDI-QKD under asymmetric channel transmittance efficiency is considered and compared with the results under the symmetric choice scenario. The relation between security key generation rate and the total transmission loss is shown with exchanged ratio of the two distances between Alice to the untrusted third party and Bob to the third party. Based on the relationship, an optimal intensity method is proposed to improve the key rate for a fixed distance ratio, which will provide important parameters for practical experiment.

• 出版日期2014-11
• 单位中国人民解放军空军工程大学; 中国人民解放军国防科学技术大学