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Characterization of Qubit Dephasing by Landau-Zener-Stückelberg-Majorana Interferometry

AuthorsForster, F.; Petersen, G.; Manus, S.; Hänggi, P.; Schuh, D.; Wegscheider; Kohler, Sigmund CSIC ORCID; Ludwig, S.
Issue Date2014
CitationAdvanced Workshop on Landau-Zener Interferometry and Quantum Control in Condensed Matter (2014)
AbstractDouble quantum dots with long coherence times allow the implementation of coherent tunnel phenomena. For instance, if an energy level of one dot is swept such that it crosses a level of the other dot, one observes Landau-Zener transitions. Repeated sweeps lead to the so-called Landau-Zener-Stückelberg interference visible in a characteristic pattern as a function of the detuning and the amplitude of the sweeps. The experimentally observed fading of this interference pattern with increasing temperature is explained in terms of a transport calculation for which a coupling to bulk phonons causes decoherence. The comparison with experimental data allows us to determine the parameters of the system-bath model and to draw conclusions about the coherence time of charge qubits implemented with double quantum dots. Changing the shape of the driving field from a pure cosine to an arbitrary periodic function has only a minor influence on the interference pattern as a function of the amplitude and the detuning. By contrast, the shape of the driving leaves its fingerprints in the Fourier transformed of the pattern. We determine ithe generic structure and the symmetries of the latter. Analytical results are confirmed by a numerical study for the driven Caldeira-Leggett model. Moreover, we determine the decay in Fourier space as a function of the dissipation strength and the temperature.
DescriptionPaper presented at the Advanced Workshop on Landau-Zener Interferometry and Quantum Control in Condensed Matter, which took place in Izmir (Turkey) between 29 September and 3 October 2014.
Appears in Collections:(ICMS) Comunicaciones congresos

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