Fast sensing of double-dot charge arrangement and spin state with an rf sensor quantum dot

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 screening and lifetime broadening.

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References in corpus (2)

• Single-shot read-out of an individual electron spin in a quantum dot
• Fast Single-Charge Sensing with an rf Quantum Point Contact

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