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

*この研究の対応する著者

研究成果: Article査読

2 被引用数 (Scopus)

抄録

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.

本文言語English
論文番号075318
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
79
7
DOI
出版ステータスPublished - 2009 2 23

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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