Charge sensitivity of the Inductive Single-Electron Transistor

Abstract

We calculate the charge sensitivity of a recently demonstrated device where the Josephson inductance of a single Cooper-pair transistor is measured. We find that the intrinsic limit to detector performance is set by oscillator quantum noise. Sensitivity better than $10^{-6}$e$/\sqrt{\mathrm{Hz}}$ is possible with a high $Q$-value $\sim 10^3$, or using a SQUID amplifier. The model is compared to experiment, where charge sensitivity $3\times 10^{-5}$e$/\sqrt{\mathrm{Hz}}$ and bandwidth 100 MHz are achieved.

3 pages

References in corpus (4)

• Circuit Quantum Electrodynamics: Coherent Coupling of a Single Photon to a Cooper Pair Box
• Manipulating the Quantum State of an Electrical Circuit
• The Inductive Single-Electron Transistor (L-SET)
• Radio-frequency Bloch-transistor electrometer

Cited by in corpus (6)

• Probing quantum devices with radio-frequency reflectometry
• A circuit analysis of an in situ tunable radio-frequency quantum point contact
• Design of a Cooper pair box electrometer for application to solid-state and astroparticle physics
• A Nonlinear Charge- and Flux-Tunable Cavity Derived from an Embedded Cooper Pair Transistor
• Fast and Ultrasensitive Electrometer Operating at the Single-Photon Level
• Charge sensitivity of a cavity-embedded Cooper pair transistor limited by single-photon shot noise