Mode-Pairing Quantum Key Distribution Based on Heralded Pair-Coherent Source
The key rate of mode-pairing quantum key distribution is limited because of using weak coherent sources as signal light sources,characterized by a limited single photon component.To address this problem,mode-pairing quantum key distribution based on heralded pair-coherent sourceis proposed,the heralded pair-coherent source is used as the signal light source in mode-pairing quantum key distribution.Due to the higher proportion of single photons in the heralded pair-coherent source,the performance of mode-pairing quantum key distribution is significantly improved.The numerical simulation is carried out in the cases of asymptotic and infinite decoy states.The result shows that the proposed protocol outperforms the mode-pairing quantum key distribution based on the weak coherent source,achieving not only a higher key rate but also a longer communication distance.The proposed protocol demonstrates a significant advantage in terms of the key rate when the transmission distance exceeds 400 km.
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