The measurement-device-independent quantum key distribution (MDI-QKD) protocol has been proposed for the purpose of removing the detector side channel attacks. Due to the multiphoton events of coherent states sources, real-life implementations of MDI-QKD protocol must employ decoy states to beat the photon-number-splitting attack. Decoy states for MDI-QKD based on the weak coherent states (WCSs) have been studied recently. In this Letter, we propose to perform MDI-QKD protocol with modified coherent states (MCS) sources. We simulate the performance of MDI-QKD with the decoy states based on MCS sources. And our simulation indicates that both the secure-key rate and transmission distance can be improved evidently with MCS sources. The physics behind this improvement is that the probability of multiphoton events of the MCS is lower than that of WCSs while at the same time the probability of single-photon is higher.
© 2014 Optical Society of America
Original Manuscript: November 12, 2013
Revised Manuscript: January 3, 2014
Manuscript Accepted: January 3, 2014
Published: February 10, 2014
Mo Li, Chun-Mei Zhang, Zhen-Qiang Yin, Wei Chen, Shuang Wang, Guang-Can Guo, and Zheng-Fu Han, "Measurement-device-independent quantum key distribution with modified coherent state," Opt. Lett. 39, 880-883 (2014)