Toward practical measurement-device-independent quantum key distribution

Lian Y. Wang, Yuanyuan Zhou, Xuejun Zhou +2 more

Zhen−Qiang Yin, Chi‐Hang Fred Fung, Xiongfeng Ma +6 more

Measurement-device-independent quantum key distribution (MDIQKD) is proposed to be secure against any possible detection attacks. The security of the original proposal relies on the assumption that the legitimate users can fully characterize the encoding systems including sources. Here, we propose a MDIQKD protocol where we allow uncharacterized encoding systems as long as qubit sources are used. A security proof of the MDIQKD protocol is presented that does not need the knowledge of the encoding states. Simulation results show that the scheme is practical.

Marcos Curty, Feihu Xu, Wei Cui +3 more

Tingting Song, Qiaoyan Wen, Fen-Zhuo Guo +1 more

The length of signal pulses is finite in practical quantum key distribution. The finite-key analysis of an unconditional quantum key distribution is a burning problem, and the efficient quantum key distribution protocol suitable for practical implementation, measurement-device-independent quantum key distribution (MDI QKD), was proposed very recently. We give the finite-key analysis of MDI QKD, which removes all detector side channels and generates many orders of key rate higher than that of full-device-independent quantum key distribution. The secure bound of the ultimate key rate is obtained under the statistical fluctuations of relative frequency, which can be applied directly to practical threshold detectors with low detection efficiency and highly lossy channels. The bound is evaluated for reasonable values of the observed parameters. The simulation shows that the secure distance is around 10 km when the number of sifted data is ${10}^{10}$. Moreover the secure distance would be much longer in practice because of some simplified treatments used in our paper.

Esther Hänggi, Renato Renner, Stefan Wolf

Henry Semenenko, Philip Sibson, Mark G. Thompson +1 more

We experimentally demonstrate integrated photonic devices for measurement-device-independent quantum key distribution with state of the art error and clock rates which will lead to more cost effective, practical, and secure communication.