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Coupled quantum dots are potential candidates for qubit systems in quantumcomputing. We use a non-invasive voltage probe to study the evolution of acoupled dot system from a situation where the dots are coupled to the leads toa situation where they are isolated from the leads. Our measurements allow usto identify the movement of electrons between the dots and we can also identifythe presence of a charge trap in our system by detecting the movement ofelectrons between the dots and the charge trap. The data also reveals evidenceof electrons moving between the dots via excited states of either the singledots or the double dot molecule.Comment: Accepted for publication in Phys. Rev. B. 4 pages, 4 figure

Noninvasive detection of the evolution of the charge states of a double dot system