Charge sensitivity of the Inductive Single-Electron Transistor

Details Charge sensitivity of the Inductive Single-Electron Transistor Charge sensitivity of the Inductive Single-Electron Transistor

2005-04-05

arxiv.org/abs/cond-mat/0504122v1

Appl. Phys. Lett. 87, 092502 (2005).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

3 pages

Scientific paper

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.

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