Probing mechanical quantum coherence with an ultracold-atom probe

Details Probing mechanical quantum coherence with an ultracold-atom probe Probing mechanical quantum coherence with an ultracold-atom probe

2011-07-04

arxiv.org/abs/1107.0750v2

Phys. Rev. A 84, 063815 (2011)

Physics

Condensed Matter

Quantum Gases

7 pages, 4 figures

Scientific paper

We propose a scheme to probe quantum coherence in the state of a nano-cantilever 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 it is thus suitable for a continuous detection of the cantilever's dynamics.

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