Radio frequency charge sensing in InAs nanowire double quantum dots

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 measur...

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Veröffentlicht in:Applied physics letters 2012-06, Vol.100 (25)
Hauptverfasser: Jung, M., Schroer, M. D., Petersson, K. D., Petta, J. R.
Format: Artikel
Sprache:eng
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Zusammenfassung: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 μs at interdot charge transitions and 9 μs for charge transitions with the leads.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4729469