Phonon decoherence of a double quantum dot charge qubit

    Authors

    S. Vorojtsov; E. R. Mucciolo;H. U. Baranger

    Comments

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    Abbreviated Journal Title

    Phys. Rev. B

    Keywords

    COMPUTATION; TRANSPORT; Physics, Condensed Matter

    Abstract

    We study decoherence of a quantum dot charge qubit due to coupling to piezoelectric acoustic phonons in the Bom-Markov approximation. After including appropriate form factors, we find that phonon decoherence rates are one to two orders of magnitude weaker than was previously predicted. We calculate the dependence of the Q factor on lattice temperature, quantum dot size, and interdot coupling. Our results suggest that mechanisms other than phonon decoherence play a more significant role in current experimental setups.

    Journal Title

    Physical Review B

    Volume

    71

    Issue/Number

    20

    Publication Date

    1-1-2005

    Document Type

    Article

    Language

    English

    First Page

    7

    WOS Identifier

    WOS:000230244300071

    ISSN

    1098-0121

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