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

State Tomography of a Chain of Qubits Embedded in a Spin Field-Effect Transistor via Repeated Spin-Blockade Measurements on the Edge Qubit