Mixing with the radiofrequency single-electron transistor

TL;DR

This paper demonstrates a radio-frequency single-electron transistor configured as a mixer, achieving high charge sensitivity and a tunable bandwidth up to 16 MHz across a frequency range of 0 to 1.2 GHz at 300 mK.

Contribution

It introduces a novel implementation of a RF single-electron transistor as a mixer with tunable frequency and bandwidth, highlighting its practical limitations and performance.

Findings

Achieved 16 MHz measurement bandwidth

Tunable center frequency from 0 to 1.2 GHz

Limited by RC time constant of ~1.6 GHz

Abstract

By configuring a radio-frequency single-electron transistor as a mixer, we demonstrate a unique implementation of this device, that achieves good charge sensitivity with large bandwidth about a tunable center frequency. In our implementation we achieve a measurement bandwidth of 16 MHz, with a tunable center frequency from 0 to 1.2 GHz, demonstrated with the transistor operating at 300 mK. Ultimately this device is limited in center frequency by the RC time of the transistor's center island, which for our device is ~ 1.6 GHz, close to the measured value. The measurement bandwidth is determined by the quality factor of the readout tank circuit.