  We study quantum information flow in a model comprising of an impurity qubit
immersed in a Bose-Einstein condensed reservoir. We demonstrate how information
flux between the qubit and the condensate can be manipulated by engineering the
ultracold reservoir within experimentally realistic limits. We place a
particular emphasis on non-Markovian dynamics, characterized by a reversed flow
of information from the background gas to the qubit and identify a controllable
crossover between Markovian and non-Markovian dynamics in the parameter space
of the model.
