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

Abstract

Charge-based qubits have been proposed as fundamental elements for quantum computers. One commonly proposed readout device is the single-electron transistor (SET). SETs can distinguish between localized charge states, but lack the sensitivity to directly distinguish superposition states, which have greatly enhanced coherence times compared with position states. We propose introducing a third dot, and exploiting energy dependent tunnelling from the qubit into this dot (bias spectroscopy) for pseudo-spin to charge conversion and superposition basis readout. We introduce an adiabatic fast passage-style charge pumping technique which enables efficient and robust readout via charge shelving, avoiding problems due to finite SET measurement time.

4 pages, 3 figures, note slightly changed title, replaced with journal version

References in corpus (5)

• Coherent manipulation of electronic states in a double quantum dot
• Quantum oscillations in two coupled charge qubits
• Charge-based quantum computing using single donors in semiconductors
• Adiabatic Transfer of Electrons in Coupled Quantum Dots
• Single-shot measurement of the Josephson charge qubit

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• Modeling Single Electron Transfer in Si:P Double Quantum Dots
• A multiplexed single electron transistor for application in scalable solid-state quantum computing
• Spectroscopy of a Cooper-Pair box in the Autler-Townes configuration
• Quantum computing based on space states without charge transfer