Cooling a micro-mechanical resonator to its ground state by measurement back-action

Details Cooling a micro-mechanical resonator to its ground state by measurement back-action Cooling a micro-mechanical resonator to its ground state by measurement back-action

2009-06-10

arxiv.org/abs/0906.1909v1

Physics

Quantum Physics

7 pages, 8 figures

Scientific paper

We present an analysis of the cooling of a micro-mechanical resonator by means of measurements and back action. The measurements are performed via the coupling to a Cooper-pair box, and although the coupling does not lead to net cooling, the extraction of information and hence entropy from the system leads to a pure quantum state. Under suitable circumstances, the states become very close to coherent states, conditioned on the measurement record, and can hence be displaced to the oscillator ground state.

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