  Quantum walks are dynamic systems with a wide range of applications in
quantum computation and quantum simulation of analog systems, therefore it is
of common interest to understand what changes from an isolated process to one
embedded in an environment. In the present work, we analyze the decoherence in
a three-state uni-dimensional quantum walk. The approaches taken into
consideration to account for the environment effects are phase and amplitude
damping Kraus operators, unitary noise on the coin space, and broken links.
