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Readout of solid-state charge qubits using a single-electron pump. (English) Zbl 1124.81007
Summary: A major difficulty in realizing a solid-state quantum computer is the reliable measurement of the states of the quantum registers. In this paper, we propose an efficient readout scheme making use of the resonant tunnelling of a ballistic electron produced by a single-electron pump. We treat the measurement interaction in detail by modelling the full spatial configuration and show that for pumped electrons with suitably chosen energy the transmission coefficient is very sensitive to the qubit state. We further show that by using a short sequence of pumping events, coupled with a simple feedback control procedure, the qubit can be measured with a high accuracy.
MSC:
81P68Quantum computation
82D20Solids (statistical mechanics)
81P15Quantum measurement theory