Journal
APPLIED PHYSICS LETTERS
Volume 100, Issue 25, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4729469
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Funding
- Sloan Foundation
- Packard Foundation
- Army Research Office [W911NF-08-1-0189]
- DARPA QuEST [HR0011-09-1-0007]
- National Science Foundation through Princeton Center for Complex Materials [DMR-0819860]
- DOE BES [DE-AC02-98CH10886]
- United States Department of Defense
- National Science Foundation through CAREER award [DMR-0846341]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0846341] Funding Source: National Science Foundation
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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 mu s at interdot charge transitions and 9 mu s for charge transitions with the leads. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4729469]
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