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Generation of mesoscopic superpositions of a binary Bose-Einstein condensate in a slightly asymmetric double well

✍ Scribed by C. Weiss; N. Teichmann

Publisher: John Wiley and Sons
Year: 2007
Tongue: English
Weight: 167 KB
Volume: 4
Category: Article
ISSN: 1612-2011
DOI: 10.1002/lapl.200710078

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✦ Synopsis

A previous publication [1] suggested to coherently generate mesoscopic superpositions of a two-component Bose-Einstein condensate in a double well under perfectly symmetric conditions. However, already tiny asymmetries can destroy the entanglement properties of the ground state. Nevertheless, even under more realistic conditions, the scheme is demonstrated numerically to generate mesoscopic superpositions.

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From a two-level model for nonlinear Landau-Zener tunnelling between two energy bands of a Bose-Einstein condensate in a periodic potential we obtain unequal tunnelling rates for the two directions of tunnelling. With increasing nonlinearity, tunnelling from the ground state to the excited state is