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