Round-Robin Differential Phase Shift with Heralded Single-Photon Source
Ying-Ying Zhang1,2, Wan-Su Bao1,2**, Chun Zhou1,2, Hong-Wei Li1,2, Yang Wang1,2, Mu-Sheng Jiang1,2
1Zhengzhou Information Science and Technology Institute, Zhengzhou 450001 2Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026
Abstract：Round-robin differential phase shift (RRDPS) is a novel quantum key distribution protocol which can bound information leakage without monitoring signal disturbance. In this work, to decrease the effect of the vacuum component in a weak coherent pulses source, we employ a practical decoy-state scheme with heralded single-photon source for the RRDPS protocol and analyze the performance of this method. In this scheme, only two decoy states are needed and the yields of single-photon state and multi-photon states, as well as the bit error rates of each photon states, can be estimated. The final key rate of this scheme is bounded and simulated over transmission distance. The results show that the two-decoy-state method with heralded single-photon source performs better than the two-decoy-state method with weak coherent pulses.
2017, Vol. 34 
