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Spin qubit systems are one of the promising candidates for quantum computing.The quantum dot (QD) arrays are intensively investigated by many researchers.Because the energy-difference between the up-spin and down-spin states is verysmall, the detection of the qubit state is of prime importance in this field.Moreover, many wires are required to control qubit systems. Therefore, theintegration of qubits and wires is also an important issue. In this study, themeasurement process of QD arrays is theoretically investigated using resonanttunneling, controlled by a conventional transistor. It is shown that the numberof possible measurements during coherence time can exceed a hundred under thebackaction of the measurements owing to the nonlinear characteristics ofresonant tunneling. It is also discussed to read out the measurement results bythe conventional transistor.

Readout using Resonant Tunneling in Silicon Spin Qubits