State tomography of a chain of qubits embedded in a spin field-effect transistor via repeated spin-blockade measurements on the edge qubit

Kazuya Yuasa, Kosuke Okano, Hiromichi Nakazato, Saori Kashiwada, Kanji Yoh

    Research output: Contribution to journalArticle

    2 Citations (Scopus)

    Abstract

    As a possible physical realization of a quantum information processor, a system with stacked self-assembled InAs quantum dots buried in GaAs adjacent to the channel of a spin field-effect transistor has been proposed. In this system, only one of the stacked qubits, i.e., the edge qubit (the qubit closest to the channel), is measurable via "spin-blockade measurement." It is shown that the state tomography of the whole chain of the qubits is still possible even under such a restricted accessibility. The idea is to make use of the entangling dynamics of the qubits. A recipe for the two-qubit system is explicitly constructed and the effect of an imperfect fidelity of the measurement is clarified. A general scheme for multiple qubits based on repeated measurements is also presented.

    Original languageEnglish
    Article number075318
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume79
    Issue number7
    DOIs
    Publication statusPublished - 2009 Feb 23

    Fingerprint

    Field effect transistors
    Tomography
    field effect transistors
    tomography
    Semiconductor quantum dots
    central processing units
    quantum dots

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Electronic, Optical and Magnetic Materials

    Cite this

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    AU - Yuasa, Kazuya

    AU - Okano, Kosuke

    AU - Nakazato, Hiromichi

    AU - Kashiwada, Saori

    AU - Yoh, Kanji

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