Abstract
In order to further improve the performance of the phase-matching quantum key distribution (PM-QKD) protocol, in this paper, a more efficient protocol named PPM-PM-QKD is proposed which adopts pulse-position modulation (PPM) to realize the high-dimensional encoding. PPM technology utilizes the empty pulses in the weak coherent source, and can improve the performance of the protocol. The simulation results show the improvement compared with the original PM-QKD protocol. Moreover, the protocol inherits the advantages of the original PM-QKD protocol, and it can not only exceed the PLOB bound, but also has a higher robust to noise and channel disturbance.
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