Four-state reference-frame-independent quantum key distribution using heralded pair-coherent sources

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We propose a four-state reference-frame-independent quantum key distribution(RFI-QKD)protocol with the heralded pair-coherent source(HPCS).We investigate the performance of the proposed protocol and simulation results show that our protocol can achieve a high key generation rate in long-distance transmission,taking source flaws and statisti-cal fluctuations into consideration.Although fewer states are used,this protocol not only has a higher key generation rate at the same transmission distance but also a longer transmission distance with the same secure communication compared with the original six-state RFI-QKD protocol using the weak coherent source(WCS).
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