Characterization of a differential radio-frequency single-electron transistor

We have fabricated and characterized an electrometer that couples two parallel single-electron transistors (SETs) to a single radio-frequency (RF) tank circuit for use as a differential RF-SET. We demonstrate operation of this device in summing, differential, and single-SET operation modes, and use it to measure a Coulomb staircase from a differential single Cooper-pair box. In differential mode, the device acts to screen out correlated input signals while being sensitive to anticorrelated signals.