Non-invasive detection of the evolution of the charge states of a double dot system

Abstract

Coupled quantum dots are potential candidates for qubit systems in quantum computing. We use a non-invasive voltage probe to study the evolution of a coupled dot system from a situation where the dots are coupled to the leads to a situation where they are isolated from the leads. Our measurements allow us to identify the movement of electrons between the dots and we can also identify the presence of a charge trap in our system by detecting the movement of electrons between the dots and the charge trap. The data also reveals evidence of electrons moving between the dots via excited states of either the single dots or the double dot molecule.

Accepted for publication in Phys. Rev. B. 4 pages, 4 figures

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Cited by in corpus (6)

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• Quantum manipulation of two-electron spin states in metastable double quantum dots
• Phonon-mediated vs. Coulombic Back-Action in Quantum Dot circuits
• Electrostatically defined Quantum Dots in a Si/SiGe Heterostructure
• Measurement of two-qubit states by quantum point contacts
• Interplay between electron spin and orbital pseudospin in double quantum dots