Control of decoherence

Analysis and comparison of three different strategies

P. Facchi, S. Tasaki, S. Pascazio, Hiromichi Nakazato, A. Tokuse, D. A. Lidar

    Research output: Contribution to journalArticle

    170 Citations (Scopus)

    Abstract

    We analyze and compare three different strategies, all aimed at controlling and eventually halting decoherence. The first strategy hinges upon the quantum Zeno effect, the second makes use of frequent unitary interruptions ("bang-bang" pulses and their generalization, quantum dynamical decoupling), and the third uses a strong, continuous coupling. Decoherence is shown to be suppressed only if the frequency N of the measurements or pulses is large enough or if the coupling K is sufficiently strong. Otherwise, if N or K is large, but not extremely large, all these control procedures accelerate decoherence. We investigate the problem in a general setting and then consider some practical examples, relevant for quantum computation.

    Original languageEnglish
    JournalPhysical Review A - Atomic, Molecular, and Optical Physics
    Volume71
    Issue number2
    DOIs
    Publication statusPublished - 2005 Feb 1

    Fingerprint

    hinges
    interruption
    quantum computation
    pulses
    decoupling

    ASJC Scopus subject areas

    • Atomic and Molecular Physics, and Optics
    • Physics and Astronomy(all)

    Cite this

    Control of decoherence : Analysis and comparison of three different strategies. / Facchi, P.; Tasaki, S.; Pascazio, S.; Nakazato, Hiromichi; Tokuse, A.; Lidar, D. A.

    In: Physical Review A - Atomic, Molecular, and Optical Physics, Vol. 71, No. 2, 01.02.2005.

    Research output: Contribution to journalArticle

    @article{25cfaecf8021489b98a1c4997065cbe6,
    title = "Control of decoherence: Analysis and comparison of three different strategies",
    abstract = "We analyze and compare three different strategies, all aimed at controlling and eventually halting decoherence. The first strategy hinges upon the quantum Zeno effect, the second makes use of frequent unitary interruptions ({"}bang-bang{"} pulses and their generalization, quantum dynamical decoupling), and the third uses a strong, continuous coupling. Decoherence is shown to be suppressed only if the frequency N of the measurements or pulses is large enough or if the coupling K is sufficiently strong. Otherwise, if N or K is large, but not extremely large, all these control procedures accelerate decoherence. We investigate the problem in a general setting and then consider some practical examples, relevant for quantum computation.",
    author = "P. Facchi and S. Tasaki and S. Pascazio and Hiromichi Nakazato and A. Tokuse and Lidar, {D. A.}",
    year = "2005",
    month = "2",
    day = "1",
    doi = "10.1103/PhysRevA.71.022302",
    language = "English",
    volume = "71",
    journal = "Physical Review A - Atomic, Molecular, and Optical Physics",
    issn = "1050-2947",
    publisher = "American Physical Society",
    number = "2",

    }

    TY - JOUR

    T1 - Control of decoherence

    T2 - Analysis and comparison of three different strategies

    AU - Facchi, P.

    AU - Tasaki, S.

    AU - Pascazio, S.

    AU - Nakazato, Hiromichi

    AU - Tokuse, A.

    AU - Lidar, D. A.

    PY - 2005/2/1

    Y1 - 2005/2/1

    N2 - We analyze and compare three different strategies, all aimed at controlling and eventually halting decoherence. The first strategy hinges upon the quantum Zeno effect, the second makes use of frequent unitary interruptions ("bang-bang" pulses and their generalization, quantum dynamical decoupling), and the third uses a strong, continuous coupling. Decoherence is shown to be suppressed only if the frequency N of the measurements or pulses is large enough or if the coupling K is sufficiently strong. Otherwise, if N or K is large, but not extremely large, all these control procedures accelerate decoherence. We investigate the problem in a general setting and then consider some practical examples, relevant for quantum computation.

    AB - We analyze and compare three different strategies, all aimed at controlling and eventually halting decoherence. The first strategy hinges upon the quantum Zeno effect, the second makes use of frequent unitary interruptions ("bang-bang" pulses and their generalization, quantum dynamical decoupling), and the third uses a strong, continuous coupling. Decoherence is shown to be suppressed only if the frequency N of the measurements or pulses is large enough or if the coupling K is sufficiently strong. Otherwise, if N or K is large, but not extremely large, all these control procedures accelerate decoherence. We investigate the problem in a general setting and then consider some practical examples, relevant for quantum computation.

    UR - http://www.scopus.com/inward/record.url?scp=33344463424&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=33344463424&partnerID=8YFLogxK

    U2 - 10.1103/PhysRevA.71.022302

    DO - 10.1103/PhysRevA.71.022302

    M3 - Article

    VL - 71

    JO - Physical Review A - Atomic, Molecular, and Optical Physics

    JF - Physical Review A - Atomic, Molecular, and Optical Physics

    SN - 1050-2947

    IS - 2

    ER -