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Dynamics of quantum cellular automata electron transition in triple quantum dots

Takumi Aizawa1,2, Motoya Shinozaki3, Yoshihiro Fujiwara1,2, Takeshi Kumasaka1, Wataru Izumida4, Arne Ludwig5, Andreas D. Wieck5, and Tomohiro Otsuka3,1,2,6,7,8,*

  • 1Research Institute of Electrical Communication, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
  • 2Graduate School of Engineering, Tohoku University, 468-1 Aramaki Aza Aoba, Aoba-ku, Sendai 980-0845, Japan
  • 3WPI Advanced Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
  • 4Department of Physics, Tohoku University, 6-3, Aramaki Aza-Aoba, Aoba-ku, Sendai 980-8578, Japan
  • 5Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum, D-44780 Bochum, Germany
  • 6Center for Spintronics Research Network, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
  • 7Center for Science and Innovation in Spintronics, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
  • 8Center for Emergent Matter Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan

  • *Contact author: tomohiro.otsuka@tohoku.ac.jp
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Phys. Rev. B 110, 235421 – Published 18 December, 2024

DOI: https://doi.org/10.1103/PhysRevB.110.235421

Abstract

The quantum cellular automata (QCA) effect is a transition in which multiple electron move coordinately by Coulomb interactions and observed in multiple quantum dots. This effect will be useful for realizing and improving quantum cellular automata and information transfer using multiple electron transfer. In this paper, we investigate the real-time dynamics of the QCA charge transitions in a triple quantum dot by using fast charge-state readout realized by rf reflectometry. We observe real-time charge transitions and analyze the tunneling rate comparing with the first-order tunneling processes. We also measure the gate voltage dependence of the QCA transition and show that it can be controlled by the voltage.

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References (36)

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Phys. Rev. B 110, 235421– Published 18 December, 2024
  • Received 10 March 2024
  • Accepted 3 December 2024
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