Inductive Single-Electron Transistor
Inductive Single-Electron Transistor
We demonstrate a sensitive method of charge detection based on radio-frequency readout of the Josephson inductance of a superconducting single-electron transistor. Charge sensitivity $1.4\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}\text{ }e/\sqrt{\mathrm{H}\mathrm{z}}$, limited by a preamplifier, is achieved in an operation mode which takes advantage of the nonlinearity of the Josephson potential. Owing to reactive readout, our …