Controlled high-fidelity navigation in the charge stability diagram of a double quantum dot
Research output: Contribution to journal › Article › Scientific › peer-review
|Number of pages||8|
|Journal||Journal of Physics: Condensed Matter|
|Publication status||Published - 25 Mar 2015|
|Publication type||A1 Journal article-refereed|
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.