Decoherence in Bose-Einstein Condensates: towards Bigger and Better Schroedinger Cats

Details Decoherence in Bose-Einstein Condensates: towards Bigger and Better Schroedinger Cats Decoherence in Bose-Einstein Condensates: towards Bigger and Better Schroedinger Cats

2000-01-20

arxiv.org/abs/cond-mat/0001301v2

Physics

Condensed Matter

12 pages in RevTex; improved presentation; a new comment on decoherence-free pointer subspaces in BEC; accepted in Phys.Rev.A

Scientific paper

10.1103/PhysRevA.62.013607

We consider a quantum superposition of Bose-Einstein condensates in two immiscible internal states. A decoherence rate for the resulting Schroedinger cat is calculated and shown to be a significant threat to this macroscopic quantum superposition of BEC's. An experimental scenario is outlined where the decoherence rate due to the thermal cloud is dramatically reduced thanks to trap engineering and "symmetrization" of the environment which allow for the Schroedinger cat to be an approximate pointer states.

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