  In this work we applied a quantum circuit treatment to describe the nuclear
spin relax- ation. From the Redfield theory, we were able to describe the
quadrupolar relaxation as a computational process in the case of spin 3/2
systems, through a model in which the environment is comprised by seven qubits
and three different quantum noise channels. The interaction between the
environment and the spin 3/2 nuclei is then described by a quantum circuit
fully compatible with the Redfield theory of relaxation. Theoretical
predictions are compared to experimental data, a short review of quantum
channels and relaxation in NMR qubits is also present.
