Coherent electronic transfer in quantum dot systems using adiabatic passage

Andrew D. Greentree, Jared H. Cole, A. R. Hamilton, and Lloyd C. L. Hollenberg
Phys. Rev. B 70, 235317 – Published 15 December 2004

Abstract

We describe a scheme for using an all-electrical, rapid, adiabatic population transfer between two spatially separated dots in a triple-quantum dot system. The electron spends no time in the middle dot and does not change its energy during the transfer process. Although a coherent population transfer method, this scheme may well prove useful in incoherent electronic computation (for example quantum-dot cellular automata) where it may provide a coherent advantage to an otherwise incoherent device. It can also be thought of as a limiting case of type II quantum computing, where sufficient coherence exists for a single gate operation, but not for the preservation of superpositions after the operation. We extend our analysis to the case of many intervening dots and address the issue of transporting quantum information through a multi-dot system.

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  • Received 18 June 2004

DOI:https://doi.org/10.1103/PhysRevB.70.235317

©2004 American Physical Society

Authors & Affiliations

Andrew D. Greentree1,2, Jared H. Cole1, A. R. Hamilton2, and Lloyd C. L. Hollenberg1

  • 1Centre for Quantum Computer Technology, School of Physics, The University of Melbourne, Melbourne, Victoria 3010, Australia
  • 2Centre for Quantum Computer Technology, School of Physics, The University of New South Wales, Sydney, New South Wales 2052, Australia

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Issue

Vol. 70, Iss. 23 — 15 December 2004

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