Possible definition of quantum bits in coupled quantum dots

In this work we investigate laterally defined quantum dots confined in AlGaAs/GaAs heterostructures comprising a two-dimensional electron gas with extremely high mobility and large phase relaxation length. Our goal is to study the intricate mechanisms of wave function interaction in these artificial molecules. We probe the wave function entanglement of two coupled quantum dots by applying transport spectroscopy at ultra low temperatures. We determine the strength of this tunnel coupled mode and monitor the magnetic field dependence. This mode is the key element for any quantum computational realization with semiconductor quantum dots.