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

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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