  Aside from significant advancements in the development of optical and quantum
components, the performance of practical quantum key distribution systems is
largely determined by the type and settings of the error key reconciliation
procedure. It is realized through public channel and it dominates the
communication complexity of the quantum key distribution process. The practical
utilization significantly depends on the computational capacities that are of
great importance in satellite-oriented quantum communications. Here we present
SarDub19 error key estimation and reconciliation protocol that improves
performances of practical quantum systems.
