Fast Sensing of Double-Dot Charge Arrangement and Spin State with a Radio-Frequency Sensor Quantum Dot
Hanson, M. P.
Gossard, Arthur C.
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CitationBarthel, 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).
AbstractSingle-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.
Citable link to this pagehttp://nrs.harvard.edu/urn-3:HUL.InstRepos:5110749
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