Algorithm for automated tuning of a quantum dot to the single electron regime.

ORAL

Abstract

Tuning quantum dot devices to an operational target is a time-consuming process. In this work, we have developed an algorithm adapted to quantum dots measured by charge detection with a single electron transistor (SET). The program uses a computer-controlled visual approach, where the tuning of the quantum dot is performed with an intuitive heuristic approach. Small size stability diagrams of the dot and reservoir gates are measured in an adaptive sequence until the last electronic transition of the quantum dot is found. For each stability diagram, the charge detector background is removed and the electron occupancy transitions are identified. From these transition points, lines are reconstructed using a modified Hough transform and other image detection tools. Preliminary tests on previously measured stability diagrams show reliable performances of the algorithm for different samples. This work is a step towards fast automatized initialization of quantum dots arrays.

*This work was supported by the Natural Sciences and Engineering Research Council of Canada (NSERC) and the Canada Foundation for Innovation (CFI). This research was undertaken thanks in part to funding from the Canada First Research Excellence Fund.

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Presenters

  • Maxime Lapointe-Major

    • Institut quantique and Département de Physique, Université de Sherbrooke, Sherbrooke, Québec, J1K 2R1, Canada

Authors

  • Maxime Lapointe-Major

    • Institut quantique and Département de Physique, Université de Sherbrooke, Sherbrooke, Québec, J1K 2R1, Canada

  • Julien Camirand Lemyre

    • Institut quantique and Département de Physique, Université de Sherbrooke, Sherbrooke, Québec, J1K 2R1, Canada
    • Institut quantique, Universite de Sherbrooke
    • Institut quantique, Université de Sherbrooke

  • Dany Lachance-Quirion

    • Institut quantique and Département de Physique, Université de Sherbrooke, Sherbrooke, Québec, J1K 2R1, Canada
    • Research Center for Advanced Science and Technology, The University of Tokyo
    • The University of Tokyo

  • Sophie Rochette

    • Institut quantique and Département de Physique, Université de Sherbrooke, Sherbrooke, Québec, J1K 2R1, Canada
    • Institut quantique, Universite de Sherbrooke

  • Michel Pioro-Ladriere

    • Institut quantique and Département de physique, Université de Sherbrooke
    • Institut quantique and Département de Physique, Université de Sherbrooke, Sherbrooke, Québec, J1K 2R1, Canada
    • Institut quantique and Département de Physique, Université de Sherbrooke
    • Institut quantique, Universite de Sherbrooke & Canadian Institute for Advanced Research
    • Universite de Sherbrooke
    • Institut quantique, Université de Sherbrooke and Canadian Institute for Advanced Research