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Nonequilibrium stabilization of charge states in double quantum dots

Udo Hartmann and Frank K. Wilhelm
Phys. Rev. B 69, 161309(R) – Published 28 April 2004
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Abstract

We analyze the decoherence of charge states in double quantum dots due to cotunneling. The system is treated using the Bloch-Redfield generalized master equation for the Schrieffer-Wolff transformed Hamiltonian. We show that the decoherence, characterized through a relaxation τr and a dephasing time τφ, can be controlled through the external voltage and that the optimum point, where these times are maximum, is not necessarily in equilibrium. We outline the mechanism of this nonequilibrium-induced enhancement of lifetime and coherence. We discuss the relevance of our results for recent charge qubit experiments.

  • Received 5 March 2004

DOI:https://doi.org/10.1103/PhysRevB.69.161309

©2004 American Physical Society

Authors & Affiliations

Udo Hartmann* and Frank K. Wilhelm

  • Physics Department and CeNS, Ludwig-Maximilians-Universität, Theresienstr. 37, D-80333 München, Germany

  • *E-mail address: hartmann@theorie.physik.uni-muenchen.de

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Issue

Vol. 69, Iss. 16 — 15 April 2004

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