Measurement-device-independent quantum key distribution with correlated source-light-intensity errors

We present an analysis for measurement-device-independent quantum key distribution with correlated source-light-intensity errors. Numerical results show that the results here can greatly improve the key rate especially with large intensity fluctuations and channel attenuation compared with prior results if the intensity fluctuations of different sources are correlated.

Figure 1

The optimal key rates (per pulse) vs transmission distance (the distance between Alice and Bob) with the results of this work and Ref. [38] under the experimental parameters listed in Table 1. Here we set the total number of pulses at each side, $N_t={10}^{13}$, and intensity fluctuation $\delta =5\%$. The line without intensity error ($\delta =0$) (red solid line) is calculated under the same parameters with the other two lines.

Figure 2

The optimal key rates (per pulse) vs transmission distance (the distance between Alice and Bob) with the results of this work and Ref. [38] under the experimental parameters listed in Table 1. Here we set the total number of pulses at each side, $N_t={10}^9$, and intensity fluctuation $\delta =5\%$.