Steady-state negative Wigner functions of nonlinear nanomechanical oscillators

S. Rips; M. Kiffner; I. Wilson-Rae; M.J. Hartmann

doi:10.1088/1367-2630/14/2/023042

Steady-state negative Wigner functions of nonlinear nanomechanical oscillators

S. Rips, M. Kiffner, I. Wilson-Rae, M.J. Hartmann

Physics

Research output: Contribution to journal › Article › peer-review

Abstract

We propose a scheme for preparing nanomechanical oscillators in nonclassical steady states, characterized by a pronounced negative Wigner function. In our optomechanical approach, the mechanical oscillator couples to multiple laser-driven resonances of an optical cavity. By lowering the resonance frequency of the oscillator via an inhomogeneous electrostatic field, we significantly enhance its intrinsic geometric nonlinearity per phonon. This causes the motional sidebands to split into separate spectral lines for each phonon number and transitions between individual phonon Fock states can be selectively addressed. We show that this enables the preparation of the nanomechanical oscillator in a single-phonon Fock state. Our scheme can, for example, be implemented with a carbon nanotube dispersively coupled to the evanescent field of a state of the art whispering gallery mode microcavity.

Original language	English
Article number	023042
Journal	New Journal of Physics
Volume	14
DOIs	https://doi.org/10.1088/1367-2630/14/2/023042
Publication status	Published - 1 Jan 2012

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Steady-state negative Wigner functions of nonlinear nanomechanical oscillators

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