Quantum limited sensitivity of SET-based displacement detectors

Details Quantum limited sensitivity of SET-based displacement detectors Quantum limited sensitivity of SET-based displacement detectors

2003-06-18

arxiv.org/abs/cond-mat/0306480v1

Phys. Rev. Lett. 92, 018303 (2004).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 eps figs

Scientific paper

10.1103/PhysRevLett.92.018303

We consider a model of a quantum-mechanical resonator capacitively coupled to a single electron transistor (SET). The tunnel current in the SET is modulated by the vibrations of the resonator, and thus the system operates as a displacement detector. We analyze the effect of the back-action noise of charge fluctuations in the SET onto the dynamics of the resonator and evaluate the displacement sensitivity of the system. The relation between the "classical" and "quantum" parts of the SET charge noise and their effect on the measured system are also discussed.

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