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Optimal control of charge with local gates in quantum-dot lattices

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Abstract

Semiconductor quantum dots are among the leading candidates for next-generation nanoscale devices due to their tunable size, shape, and low energy consumption. Here we apply quantum optimal control theory to coherently manipulate the single-electron charge distribution in quantum-dot lattices of various sizes. In particular, we show that to control the charge distribution it is sufficient to optimize the gate voltage acting on a single quantum dot in the lattice. We generally find yields around 99% in the picosecond time scale when using realistic models for the quantum-dot lattices on a real-space grid. We analyze and discuss both the limitations of the model regarding the gate parameters as well as the potential of the scheme for applications as quantum-dot cellular automata.

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Authors and Affiliations

  1. Department of Physics, Tampere University of Technology, 33101, Tampere, Finland

    Yousof Mardoukhi & Esa Räsänen

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  1. Yousof Mardoukhi
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  2. Esa Räsänen
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Correspondence to Esa Räsänen.

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Mardoukhi, Y., Räsänen, E. Optimal control of charge with local gates in quantum-dot lattices. Eur. Phys. J. B 87, 144 (2014). https://doi.org/10.1140/epjb/e2014-50224-0

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  • DOI: https://doi.org/10.1140/epjb/e2014-50224-0

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