  Atom chips provide compact and robust platforms towards practical quantum
technologies. A quick and faithful preparation of arbitrary input states for
these systems is crucial but represents a very challenging experimental task.
This is especially difficult when the dynamical evolution is noisy and
unavoidable setup imperfections have to be considered. Here, we experimentally
prepare with very high small errors different internal states of a Rubidium
Bose-Einstein condensate realized on an atom chip. As a possible application of
our scheme, we apply it to improve the sensitivity of an atomic interferometer.

Quantum Physics;Quantum Gases;Atomic Physics