Control of decoherence via quantum Zeno subspaces

Paolo Facchi, Hiromichi Nakazato, Saverio Pascazio, Shuichi Tasaki

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    Abstract

    We discuss three control strategies, whose objective is to counter the effects of decoherence: the first strategy hinges upon the quantum Zeno effect, the second makes use of frequent unitary interruptions ("bang-bang" pulses), and the third of a strong, continuous coupling. Decoherence can be suppressed only if the frequency τ-1 of the measurements/pulses is large enough or if the coupling K is sufficiently strong. Otherwise, if τ-1 or K are large, but not sufficiently large, all these control procedures accelerate decoherence.

    Original languageEnglish
    Pages (from-to)1408-1420
    Number of pages13
    JournalInternational Journal of Modern Physics B
    Volume20
    Issue number11-13
    DOIs
    Publication statusPublished - 2006 May 20

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    Keywords

    • Control
    • Decoherence
    • Dissipation
    • Quantum Zeno effect

    ASJC Scopus subject areas

    • Physics and Astronomy (miscellaneous)
    • Condensed Matter Physics
    • Electronic, Optical and Magnetic Materials
    • Statistical and Nonlinear Physics
    • Mathematical Physics

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