Quantum limited amplification with a nonlinear cavity detector

Details Quantum limited amplification with a nonlinear cavity detector Quantum limited amplification with a nonlinear cavity detector

2010-11-26

arxiv.org/abs/1011.5938v1

Phys.Rev.A83:033803,2011

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

15 pages, 6 figures

Scientific paper

10.1103/PhysRevA.83.033803

We consider the quantum measurement properties of a driven cavity with a Kerr-type nonlinearity which is used to amplify a dispersively coupled input signal. Focusing on an operating regime which is near a bifurcation point, we derive simple asymptotic expressions describing the cavity's noise and response. We show that the cavity's backaction and imprecision noise allow for quantum limited linear amplification and position detection only if one is able to utilize the sizeable correlations between these quantities. This is possible when one amplifies a non-resonant signal, but is not possible in QND qubit detection. We also consider the possibility of using the nonlinear cavity's backaction for cooling a mechanical mode.

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