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An efficiency-loophole-free quantum key distribution (QKD) scheme isproposed, which involves no hardware change but a modification in the datapost-processing step. The scheme applies to a generic class of detectionsystems which allow correlations between the detection efficiency and theoutcomes. We study the system transmittance and the detection error rate thatallow implementing this scheme. We also consider the case that a quantum memoryis used to boost the performance and investigate the criteria of the readoutprobability. The simulation result shows that the lowest tolerable systemtransmittance (readout probability) is 50%, while the necessary efficiency foran efficiency-loophole-free Bell's inequality test is 82.8%.

Quantum key distribution secure against the efficiency loophole