  Post-processing is a significant step in quantum key distribution(QKD), which
is used for correcting the quantum-channel noise errors and distilling
identical corrected keys between two distant legitimate parties. Efficient
error reconciliation protocol, which can lead to an increase in the secure key
generation rate, is one of the main performance indicators of QKD setups. In
this paper, we propose a multi-low-density parity-check codes based
reconciliation scheme, which can provide remarkable perspectives for highly
efficient information reconciliation. With testing our approach through data
simulation, we show that the proposed scheme combining multi-syndrome-based
error rate estimation allows a more accurate estimation about the error rate as
compared with random sampling and single-syndrome estimation techniques before
the error correction, as well as a significant increase in the efficiency of
the procedure without compromising security and sacrificing reconciliation
efficiency.
