Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2008-02-13
New J. Phys. 10, 095010 (2008) (Focus Issue)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
11 pages, 3 figures
Scientific paper
10.1088/1367-2630/10/9/095010
We study the quantum measurement of a cantilever using a parametrically-coupled electromagnetic cavity which is driven at the two sidebands corresponding to the mechanical motion. This scheme, originally due to Braginsky et al. [V. Braginsky, Y. I. Vorontsov, and K. P. Thorne, Science 209, 547 (1980)], allows a back-action free measurement of one quadrature of the cantilever's motion, and hence the possibility of generating a squeezed state. We present a complete quantum theory of this system, and derive simple conditions on when the quantum limit on the added noise can be surpassed. We also study the conditional dynamics of the measurement, and discuss how such a scheme (when coupled with feedback) can be used to generate and detect squeezed states of the oscillator. Our results are relevant to experiments in optomechanics, and to experiments in quantum electromechanics employing stripline resonators coupled to mechanical resonators.
Clerk Aashish A.
Jacobs Karl
Marquardt Florian
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