Controlled high-fidelity navigation in the charge stability diagram of a double quantum dot

Diego S. Acosta Coden, Rodolfo H. Romero, Esa Räsänen

    Tutkimustuotos: ArtikkeliScientificvertaisarvioitu

    3 Sitaatiot (Scopus)


    We propose an efficient control protocol for charge transfer in a double quantum dot. We consider numerically a two-dimensional model system, where the quantum dots are subjected to time-dependent electric fields corresponding to experimental gate voltages. Our protocol enables navigation in the charge stability diagram from a state to another through controllable variation of the fields. We show that the well-known adiabatic Landau-Zener transition-when supplemented with a time-dependent field tailored with optimal control theory-can remarkably improve the transition speed. The results also lead to a simple control scheme obtained from the experimental charge stability diagram that requires only a single parameter. Eventually, we can achieve the ultrafast performance of the composite pulse protocol that allows the system to be driven at the quantum speed limit.

    JulkaisuJournal of Physics: Condensed Matter
    DOI - pysyväislinkit
    TilaJulkaistu - 25 maalisk. 2015
    OKM-julkaisutyyppiA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä


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