Fast sensing of double-dot charge arrangement and spin state with a radio-frequency sensor quantum dot

Article

关键词: SINGLE-ELECTRON TRANSISTOR;    COULOMB-BLOCKADE;   

DOI  :  10.1103/PhysRevB.81.161308

来源: SCIE

【 摘 要 】

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.

【 授权许可】

Free