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arXiv · 1205.6494

Radio frequency charge sensing in InAs nanowire double quantum dots

M. Jung·M. D. Schroer·K. D. Petersson·J. R. Petta
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Abstract

We demonstrate charge sensing of an InAs nanowire double quantum dot (DQD) coupled to a radio frequency (rf) circuit. We measure the rf signal reflected by the resonator using homodyne detection. Clear single dot and DQD behavior are observed in the resonator response. rf-reflectometry allows measurements of the DQD charge stability diagram in the few-electron regime even when the dc current through the device is too small to be measured. For a signal-to-noise ratio of one, we estimate a minimum charge detection time of 350 microseconds at interdot charge transitions and 9 microseconds for charge transitions with the leads.

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M. Jung, M. D. Schroer, K. D. Petersson, J. R. Petta. 2012-05-29. Radio frequency charge sensing in InAs nanowire double quantum dots. https://doi.org/10.1063/1.4729469

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