Radio-frequency Bloch-transistor electrometer
摘要
A quantum-limited electrometer based on charge modulation of the Josephson supercurrent in the Bloch transistor inserted into a superconducting ring is proposed. As this ring is inductive coupled to a high-Q resonance tank circuit, the variations of the charge on the transistor island (input signal) are converted into variations of amplitude and phase of radio-frequency oscillations in the tank. These variations are amplified and then detected. The output noise, the back-action fluctuations and their cross-correlation are computed. It is shown that our device enables measurements of the charge with a sensitivity which is determined by the energy resolution of its amplifier, that can be reduced down to the standard quantum limit of \hbar/2. On the basis of this setup a "back-action-evading" scheme of the charge measurements is proposed.
引用
@article{arxiv.cond-mat/0012314,
title = {Radio-frequency Bloch-transistor electrometer},
author = {A. B. Zorin},
journal= {arXiv preprint arXiv:cond-mat/0012314},
year = {2009}
}
备注
5 pages incl. 2 figures