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)

    Abstrakti

    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.

    AlkuperäiskieliEnglanti
    Artikkeli115303
    Sivumäärä8
    JulkaisuJournal of Physics: Condensed Matter
    Vuosikerta27
    Numero11
    DOI - pysyväislinkit
    TilaJulkaistu - 25 maalisk. 2015
    OKM-julkaisutyyppiA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

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