Measuring the quantum state of a nanomechanical oscillator

Details Measuring the quantum state of a nanomechanical oscillator Measuring the quantum state of a nanomechanical oscillator

2009-08-10

arxiv.org/abs/0908.1415v1

Physics

Quantum Physics

4 pages, 2 figures

Scientific paper

We propose a scheme to measure the quantum state of a nanomechanical oscillator cooled near its ground state of vibrational motion. This is an extension of the nonlinear atomic homodyning technique scheme first developed to measure the intracavity field in a micromaser. It involves the use of a detector-atom that is simultaneously coupled to the cantilever via a magnetic interaction and to (classical) optical fields via a Raman transition. We show that the probability for the atom to be found in the excited state is a direct measure of the Wigner characteristic function of the nanomechanical oscillator. We also investigate the backaction effect of this destructive measurement on the state of the cantilever.

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