  We elucidate the universal spatio-temporal scaling properties of the
time-dependent correlation functions in a two-component one-dimensional (1D)
driven diffusive system that consists of two coupled asymmetric exclusion
process. By using a perturbative renormalization group framework, we show that
the relevant scaling exponents have values same as those for the 1D
Kardar-Parisi-Zhang (KPZ) equation. We thus establish that the model belongs to
the 1D KPZ universality class.
