Quantum-dot cellular automata using buried dopants

Jared H. Cole, Andrew D. Greentree, Cameron J. Wellard, Lloyd C. L. Hollenberg, and Steven Prawer
Phys. Rev. B 71, 115302 – Published 7 March 2005

Abstract

The use of buried dopants to construct quantum-dot cellular automata is investigated as an alternative to conventional electronic devices for information transport and elementary computation. This provides a limit in terms of miniaturization for this type of system as each potential well is formed by a single dopant atom. As an example, phosphorous donors in silicon are found to have good energy level separation with incoherent switching times of the order of microseconds. However, we also illustrate the possibility of ultrafast quantum coherent switching via adiabatic evolution. The switching speeds are numerically calculated and found to be tens of picoseconds or less for a single cell. The effect of decoherence is also simulated in the form of a dephasing process and limits are estimated for operation with finite dephasing. The advantages and limitations of this scheme over the more conventional quantum-dot based scheme are discussed. The use of a buried donor cellular automata system is also discussed as an architecture for testing several aspects of buried donor based quantum computing schemes.

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  • Received 25 July 2004

DOI:https://doi.org/10.1103/PhysRevB.71.115302

©2005 American Physical Society

Authors & Affiliations

Jared H. Cole*, Andrew D. Greentree, Cameron J. Wellard, Lloyd C. L. Hollenberg, and Steven Prawer

  • Centre for Quantum Computer Technology, School of Physics, The University of Melbourne, Melbourne, Victoria 3010, Australia

  • *Electronic address: j.cole@physics.unimelb.edu.au

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Vol. 71, Iss. 11 — 15 March 2005

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