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

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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.

Journal

  • Physical Review. B, Condensed Matter and Materials Physics

    Physical Review. B, Condensed Matter and Materials Physics 79(7), 075318, 2009-02

    American Physical Society

Codes

  • NII Article ID (NAID)
    120001164608
  • NII NACSIS-CAT ID (NCID)
    AA11187113
  • Text Lang
    ENG
  • Article Type
    journal article
  • ISSN
    1098-0121
  • Data Source
    IR 
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