Modeling two-spin dynamics in a noisy environment

M. J. Testolin, J. H. Cole, and L. C. L. Hollenberg
Phys. Rev. A 80, 042326 – Published 23 October 2009

Abstract

We describe how the effect of charge noise on a pair of spins coupled via the exchange interaction can be calculated by modeling charge fluctuations as a random telegraph noise process using probability density functions. We develop analytic expressions for the time-dependent superoperator of a pair of spins as a function of fluctuation amplitude and rate. We show that the theory can be extended to include multiple fluctuators, in particular, spectral distributions of fluctuators. These superoperators can be included in time-dependent analyses of the state of spin systems designed for spintronics or quantum information processing to determine the decohering effects of exchange fluctuations.

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  • Received 1 April 2009

DOI:https://doi.org/10.1103/PhysRevA.80.042326

©2009 American Physical Society

Authors & Affiliations

M. J. Testolin1, J. H. Cole1,2, and L. C. L. Hollenberg1

  • 1Centre for Quantum Computer Technology, School of Physics, The University of Melbourne, Victoria 3010, Australia
  • 2Institut für Theoretische Festkörperphysik und DFG-Center for Functional Nanostructures (CFN), Universität Karlsruhe, 76128 Karlsruhe, Germany

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Vol. 80, Iss. 4 — October 2009

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