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

Research output: Contribution to journalArticleScientificpeer-review

Details

Original languageEnglish
Article number115303
Number of pages8
JournalJournal of Physics: Condensed Matter
Volume27
Issue number11
DOIs
Publication statusPublished - 25 Mar 2015
Publication typeA1 Journal article-refereed

Abstract

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.

Keywords

  • quantum dots, charge stability diagram, quantum control, PULSES

Publication forum classification

Field of science, Statistics Finland