  In this paper we study quantum dynamics of the bouncing cosmological model.
We focus on the model of the flat Friedman-Robertson-Walker universe with a
free scalar field. The bouncing behavior, which replaces classical singularity,
appears due to the modification of general relativity along the methods of loop
quantum cosmology. We show that there exist a unitary transformation that
enables to describe the system as a free particle with Hamiltonian equal to
canonical momentum. We examine properties of the various quantum states of the
Universe: boxcar state, standard coherent state, and soliton-like state, as
well as Schr{\"o}dinger's cat states constructed from these states.
Characteristics of the states such as quantum moments and Wigner functions are
investigated. We show that each of these states have, for some range of
parameters, a proper semiclassical limit fulfilling the correspondence
principle. Decoherence of the superposition of two universes is described and
possible interpretations in terms of triad orientation and
Belinsky-Khalatnikov-Lifshitz conjecture are given. Some interesting features
regarding the area of the negative part of the Wigner function have emerged.
