To overcome the signal disturbance from the transmission process, recently, a new type of protocol named round-robin differential-phase-shift(RRDPS) quantum key distribution[Nature 509, 475(2014)] is proposed. It can estimate how much information has leaked to eavesdropper without monitoring bit error rates. In this paper, we compare the performance of RRDPS using different sources without and with decoy-state method, such as weak coherent pulses(WCPs) and heralded single photon source(HSPS). For practical implementations, we propose finite decoy-state method for RRDPS, the performance of which is close to the infinite one. Taking WCPs as an example, the three-intensity decoystate protocol can distribute secret keys over a distance of 128 km when the length of pulses packet is 32, which confirms the great practical interest of our method.
@article{arxiv.1605.02853,
title = {Practical decoy-state round-robin differential-phaseshift quantum key distribution},
author = {Ying-Ying Zhang and Wan-Su Bao and Chun Zhou and Hong-Wei Li and Yang Wang and Mu-Sheng Jiang},
journal= {arXiv preprint arXiv:1605.02853},
year = {2016}
}