Phonon-induced decoherence and dissipation in donor-based charge qubits

J. Eckel (), S. Weiss and M. Thorwart

The European Physical Journal B: Condensed Matter and Complex Systems, 2006, vol. 53, issue 1, 91-98

Abstract: We investigate the phonon-induced decoherence and dissipation in a donor-based charge quantum bit realized by the orbital states of an electron shared by two dopant ions which are implanted in a silicon host crystal. The dopant ions are taken from the group-V elements Bi, As, P, Sb. The excess electron is coupled to deformation potential acoustic phonons which dominate in the Si host. The particular geometry tailors a non-monotonous frequency distribution of the phonon modes. We determine the exact qubit dynamics under the influence of the phonons by employing the numerically exact quasi-adiabatic propagator path integral scheme thereby taking into account all bath-induced correlations. In particular, we have improved the scheme by completely eliminating the Trotter discretization error by a Hirsch-Fye extrapolation. By comparing the exact results to those of a Born-Markov approximation we find that the latter yields appropriate estimates for the decoherence and relaxation rates. However, noticeable quantitative corrections due to non-Markovian contributions appear. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2006

Keywords: 03.67.Lx Quantum computation, 63.20.Kr Phonon-electron and phonon-phonon interactions, 03.65.Yz Decoherence; open systems; quantum statistical methods, (search for similar items in EconPapers)
Date: 2006
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DOI: 10.1140/epjb/e2006-00346-y

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