  We have considered a system consisting of two coupled quantum dots containing
two electrons, i.e., two quantum dots next to each other with one excess
electron each, subjected to an uniform magnetic field perpendicular to the
quantum dots plane. The effect of different confinement potential profiles
under which the electrons are subjected is studied. This study has been
performed in the light of interest in fundamental logical quantum-gate
operations: we have been concerned in analysing the behaviour of the main
physical quantities which should be involved in a two-qubit quantum-gate
operation for two different profiles of confinement found in literature. Our
purpose was to establish how sensitive the physical quantities are to the
confinement profile and in which range of magnetic field this issue can be
critical.
