The phase-matching quantum key distribution (PM-QKD), one of the variants of Twin-Field (TF) QKD protocol, was recently proposed to overcome the rate-distance limits of point to point protocol without quantum repeaters. In this paper, we propose a more practical PM-QKD protocol version with four-intensity decoy states and source errors, since neither the infinite decoy states nor the precise control of the light source is available in practice. We present the formulation of the secure key rate of the proposed protocol and analyze the performances of the protocol with and without source errors by numerical simulations.
The round-robin differential-phase-shift quantum key distribution (RRDPS-QKD) protocol could provide an effective way to estimate the leakage information without monitoring the signal disturbance. Moreover, the self-compensating property of plug-and-play (P&P) setup can eliminate the variations of phase or polarization in QKD procedure. In the paper, we introduce the P&P concept into RRDPS-QKD, and propose a QKD protocol, named P&P RRDPS-QKD protocol, to make the RRDPS-QKD scheme more practical. We analyze the security, and discuss the key generation rate with infinite-intensity decoy state method. The results show that the proposed protocol is a good solution to RRDPS-QKD protocol with untrusted sources. It has a high security and its key generation rate could be as good as the protocol with trusted sources when the average input photon number N is greater than 106. In addition, the proposed protocol has a high noise tolerance in comparison with P&P BB84-QKD protocol.
Round-robin differential-phase-shift (RRDPS) quantum key distribution (QKD) protocol is a practical QKD protocol without monitoring the signal disturbance. However, how to further increase the secure key rate is still a challenge in practice. In the paper, we propose a high efficient QKD protocol based on RRDPS-QKD, where the photon-states are encoded in two degrees of freedom (DOFs), phase and polarization. The key generation rate and the security of the proposal protocol are analyzed. The simulation results show that the secure key rate is greatly improved in comparison with the original RRDPS-QKD protocol by breaking the limitation of quantum state in a single DOF. Moreover, our protocol can still maintain the high error tolerance of RRDPS-QKD protocol.
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