M. R. Hush, S. S. Szigeti, A. R. R. Carvalho, J. J. Hope
A Bose-Einstein condensate (BEC) undergoing measurement-based feedback cooling is analysed with a full quantum-field simulation. Two experimental setups are considered: a BEC in a cavity and a trapped BEC undergoing phase-contrast imaging. An experimentally important parameter regime is found where the simulation results diverge from the predictions of both single-mode quantum models and multi-mode semiclassical models. In this regime, simple cooling schemes cannot control the quantum noise limited heating due to measurement backaction. We describe a feedback scheme that is specifically adapted to the measurement, which can still produce cooling.
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http://arxiv.org/abs/1301.1963
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