Decoherence and long-lived Schroedinger cats in BEC

Details Decoherence and long-lived Schroedinger cats in BEC Decoherence and long-lived Schroedinger cats in BEC

2000-06-22

arxiv.org/abs/cond-mat/0006349v1

Physics

Condensed Matter

9 pages, 5 figures. Talk to be given at NATO Advanced Research Workshop (Mykonos, Greece), and at the XL Crakow School of Theo

Scientific paper

We consider quantum superposition states in Bose-Einstein condensates. A decoherence rate for the Schr\"odinger 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. We show that under the proposed scenario the Schroedinger cat belongs to an approximate decoherence-free pointer subspace. This paper is a simplified and more pedagogical version of our previous work, Phys.Rev. A62, 13607 (2000).

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