  Reconciliation is an important step to correct errors in Quantum Key
Distribution (QKD). In QKD, after comparing basis, two legitimate parties
possess two correlative keys which have some differences and they could obtain
identical keys through reconciliation. In this paper, we present a new rate
compatible reconciliation scheme based on Row Combining with Edge Variation
(RCEV) Low Density Parity Check (LDPC) codes which could change code rate
adaptively in noisy channel where error rate may change with time. Our scheme
is easy to implement and could get good efficiency compared to existing
schemes. Meanwhile, due to the inherent structure we use, the new scheme not
only saves memory space remarkably but also simplifies the decoder architecture
and accelerates the decoding.
