Probing mechanical quantum coherence with an ultracold-atom meter

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Date
2011
Authors
Lo Gullo, Nicola
Busch, Thomas
Palma, G. M.
Paternostro, Mauro
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American Physical Society
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Abstract
We propose a scheme to probe quantum coherence in the state of a nanocantilever based on its magnetic coupling (mediated by a magnetic tip) with a spinor Bose Einstein condensate (BEC). By mapping the BEC into a rotor, its coupling with the cantilever results in a gyroscopic motion whose properties depend on the state of the cantilever: the dynamics of one of the components of the rotor angular momentum turns out to be strictly related to the presence of quantum coherence in the state of the cantilever. We also suggest a detection scheme relying on Faraday rotation, which produces only a very small back-action on the BEC and is thus suitable for a continuous detection of the cantilever's dynamics.
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Keywords
Bose-Einstein condensate , Radiation-pressure , Optical cavity , Dynamics , Spin , Optomechanics , Micromirror , Resonator , State
Citation
Lo Gullo, N., Busch, T., Palma, G. M. and Paternostro, M. (2011) 'Probing mechanical quantum coherence with an ultracold-atom meter', Physical Review A, 84(6), 063815 (7pp). doi: 10.1103/PhysRevA.84.063815
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© 2011, American Physical Society