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Charge-based qubits have been proposed as fundamental elements for quantumcomputers. One commonly proposed readout device is the single-electrontransistor (SET). SETs can distinguish between localized charge states, butlack the sensitivity to directly distinguish superposition states, which havegreatly enhanced coherence times compared with position states. We proposeintroducing a third dot, and exploiting energy dependent tunnelling from thequbit into this dot (bias spectroscopy) for pseudo-spin to charge conversionand superposition basis readout. We introduce an adiabatic fast passage-stylecharge pumping technique which enables efficient and robust readout via chargeshelving, avoiding problems due to finite SET measurement time.Comment: 4 pages, 3 figures, note slightly changed title, replaced with  journal versio

Charge shelving and bias spectroscopy for the readout of a charge qubit on the basis of superposition states