Julien Basset, David-Dominik Jarausch, Anna Stockklauser, Tobias Frey, Christian Reichl, Werner Wegscheider, Thomas Markus Ihn, Klaus Ensslin, Andreas Wallraff
We have realized a hybrid solid-state quantum device in which a single-electron semiconductor double quantum dot dipole couples to the voltage oscillations of a nearby superconducting transmission line resonator. The amplitude and phase of the microwave tone transmitted through the resonator allow for determining the coherence properties of the double dot and measuring its interdot tunnel coupling. The value and uncertainty of the tunnel coupling was determined both with the microwave read-out technique and a standard quantum point contact charge detector. We demonstrate that the two techniques are equivalent with a superior precision for the microwave experiment. Decoherence properties of the dots, compared within the same sample in the single-electron and many-electron regimes, are also found equivalent.
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http://arxiv.org/abs/1304.5141
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