Publication: Fast Sensing of Double-Dot Charge Arrangement and Spin State with a Radio-Frequency Sensor Quantum Dot
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Date
2010
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American Physical Society
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Citation
Barthel, Christian, M. Kjærgaard, James Redding Medford, Michael Stopa, Charles Masamed Marcus, M. P. Hanson, and Arthur C. Gossard. 2010. Fast sensing of double-dot charge arrangement and spin state with a radio-frequency sensor quantum dot. Physical Review B 81(161308R).
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Abstract
Single-shot measurement of the charge arrangement and spin state of a double quantum dot are reported with measurement times down to 100 ns. Sensing uses radio-frequency reflectometry of a proximal quantum dot in the Coulomb blockade regime. The sensor quantum dot is up to 30 times more sensitive than a comparable quantum point-contact sensor and yields three times greater signal to noise in rf single-shot measurements. Numerical modeling is qualitatively consistent with experiment and shows that the improved sensitivity of the sensor quantum dot results from reduced lifetime broadening and screening.
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Keywords
Coulomb-blockade, single-electron transistor
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