Radio frequency charge sensing in InAs nanowire double quantum dots

M. Jung, M. D. Schroer, K. D. Petersson, J. R. Petta

Research output: Contribution to journalArticlepeer-review

40 Scopus citations


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.

Original languageEnglish (US)
Article number253508
JournalApplied Physics Letters
Issue number25
StatePublished - Jun 18 2012

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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