Large time asymptotics for a cubic nonlinear Schr\"odinger system in one space dimension

We consider a two-component system of cubic nonlinear Schr"odinger equations in one space dimension. We show that each component of the solutions to this system behaves like a free solution in the large time, but there is a strong restriction between the profiles of them. This turns out to be a consequence of non-trivial long-range nonlinear interactions.