Quantum system identification

Daniel Burgarth, Kazuya Yuasa

    Research output: Contribution to journalArticle

    37 Citations (Scopus)

    Abstract

    The aim of quantum system identification is to estimate the ingredients inside a black box, in which some quantum-mechanical unitary process takes place, by just looking at its input-output behavior. Here we establish a basic and general framework for quantum system identification, that allows us to classify how much knowledge about the quantum system is attainable, in principle, from a given experimental setup. We show that controllable closed quantum systems can be estimated up to unitary conjugation. Prior knowledge on some elements of the black box helps the system identification. We present an example in which a Bell measurement is more efficient to identify the system. When the topology of the system is known, the framework enables us to establish a general criterion for the estimability of the coupling constants in its Hamiltonian.

    Original languageEnglish
    Article number080502
    JournalPhysical Review Letters
    Volume108
    Issue number8
    DOIs
    Publication statusPublished - 2012 Feb 23

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    system identification
    boxes
    conjugation
    bells
    ingredients
    topology
    output
    estimates

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

    Cite this

    Quantum system identification. / Burgarth, Daniel; Yuasa, Kazuya.

    In: Physical Review Letters, Vol. 108, No. 8, 080502, 23.02.2012.

    Research output: Contribution to journalArticle

    Burgarth, Daniel ; Yuasa, Kazuya. / Quantum system identification. In: Physical Review Letters. 2012 ; Vol. 108, No. 8.
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