Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session A74: Spin Qubit Arrays I
8:00 AM–11:00 AM,
Monday, March 6, 2023
Room: Room 403/404
Sponsoring
Unit:
DQI
Chair: Andre Saraiva, Diraq
Abstract: A74.00004 : Charge control in a 2x2 semiconductor quantum-dot array with shared control electrodes.
9:00 AM–9:12 AM
Presenter:
Emmanuel Chanrion
(Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, Grenoble, France)
Authors:
Emmanuel Chanrion
(Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, Grenoble, France)
Pierre-André Mortemousque
(Univ. Grenoble Alpes, CEA, Leti, Grenoble, France)
Baptiste Jadot
(Univ. Grenoble Alpes, CEA, Leti, Grenoble, France)
Martin Nurizzo
(Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel)
Arne Ludwig
(Lehrstuhl fül Angewandte Festkörperphysik, Rhur-Universität Bochum, Bochum, Germany)
Andreas D Wieck
(Lehrstuhl fül Angewandte Festkörperphysik, Rhur-Universität Bochum, Bochum, Germany)
Christopher Bäuerle
(Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, Grenoble, France)
Matias Urdampilleta
(Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, Grenoble, France)
Tristan Meunier
(Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, Grenoble, France)
In this presentation, we demonstrate a scalable QD array formed of shared control gates with row/column addressing, in a GaAs/AlGaAs heterostructure. Similar to classical integrated circuits, large-scale quantum-dot arrays must drastically reduce the number of interconnects. Here, the crossbar network limits the number of electrodes for a ??x?? QD array to only 4??. We show the loading and trapping of one to five electrons inside a single-dot. Then, despite the limited number of electrodes, we control the electron distribution in the isolated 2x2 QD array for the different numbers of loaded charges. The constant interaction model reproduces the isolated stability diagrams and characterizes the QD array. In addition, we show the ability to tune the inter-dot tunnelling rate from the GHz to the sub-kHz regime.
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