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The decoy-state method has been developed rapidly in quantum key distribution(QKD) since it is immune to photon-number splitting attacks. However, two basisdetector efficiency asymmetry, which exists in realistic scenarios, has beenignored in the prior results. By using the recent 4-intensity decoy-stateoptimization protocol, we report the first implementation of high-rate QKD withasymmetric basis detector efficiency, demonstrating 1.9 to 33.2 times higherkey rate than previous protocols in the situation of large basis detectorefficiency asymmetry. The results ruled out an implicitly assumption in QKDthat the efficiency of Z basis and X basis are restricted to be same. This workpaves the way towards a more practical QKD setting.

Experimental 4-intensity decoy-state quantum key distribution with asymmetric basis detector efficiency