Measurement-device-independent quantum key distribution (MDI-QKD) is immune to all security loopholes on detection. Previous experiments on MDI-QKD required spatially separated signal lasers and complicated stabilization systems. In this paper, we perform a proof-of-principle experimental demonstration of plug-and-play MDI-QKD over an asymmetric channel setting with a single signal laser, in which the whole system is automatically stabilized in spectrum, polarization, arrival time and phase reference. Both the signal laser and the single-photon detectors are in the possession of a common server. A passive timing calibration technique is applied to ensure the precise and stable overlap of signal pulses. The results pave the way for the realization of a quantum network, in which the users only need the encoding devices.
@article{arxiv.1609.02648,
title = {Experimental asymmetric Plug-and-Play Measurement-device-independent quantum key distribution},
author = {Guang-Zhao Tang and Shi-Hai Sun and Feihu Xu and Huan Chen and Chun-Yan Li and Lin-Mei Liang},
journal= {arXiv preprint arXiv:1609.02648},
year = {2016}
}