Theoretical analysis of mechanical displacement measurement using a multiple cavity mode transducer

Details Theoretical analysis of mechanical displacement measurement using a multiple cavity mode transducer Theoretical analysis of mechanical displacement measurement using a multiple cavity mode transducer

2009-03-05

arxiv.org/abs/0903.1013v2

Physics

Quantum Physics

5 pages, 3 figures. Revised and amended version

Scientific paper

We present an optomechanical displacement transducer, that relies on three cavity modes parametrically coupled to a mechanical oscillator and whose frequency spacing matches the mechanical resonance frequency. The additional resonances allow to reach the standard quantum limit at substantially lower input power (compared to the case of only one resonance), as both, sensitivity and quantum backaction are enhanced. Furthermore, it is shown that in the case of multiple cavity modes, coupling between the modes is induced via reservoir interaction, e.g., enabling quantum backaction noise cancellation. Experimental implementation of the schemes is discussed in both the optical and microwave domain.

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