Physics – Condensed Matter – Superconductivity
Scientific paper
2000-12-17
Phys. Rev. Lett. 86, 3388 (2001)
Physics
Condensed Matter
Superconductivity
5 pages incl. 2 figures
Scientific paper
10.1103/PhysRevLett.86.3388
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.
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