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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dc.creatorYuasa, Kazuya
dc.creatorOkano, Kosuke
dc.creatorNakazato, Hiromichi
dc.creatorKashiwada, Saori
dc.creatorYoh, Kanji
dc.date2008-06-05
dc.date2009-03-19
dc.date.accessioned2026-07-07T12:53:23Z
dc.date.available2026-07-07T12:53:23Z
dc.descriptionAs a possible physical realization of a quantum information processor, a system with stacked self-assembled InAs quantum dots buried in GaAs in 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.
dc.description6 pages, 4 figures
dc.identifierhttps://arxiv.org/abs/0806.1032
dc.identifierhttp://arxiv.org/abs/0806.1032
dc.identifierPhys. Rev. B 79 (2009) 075318
dc.identifierdoi:10.1103/PhysRevB.79.075318
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/223604
dc.subjectMesoscale and Nanoscale Physics
dc.subjectQuantum Physics
dc.titleState 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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