Volume 78, Number 1, April 2007
Article Number 10009
Number of page(s) 6
Section General
Published online 16 March 2007
EPL, 78 (2007) 10009
DOI: 10.1209/0295-5075/78/10009

Coherently controlled entanglement generation in a binary Bose-Einstein condensate

N. Teichmann1 and C. Weiss2

1  Institut für Physik, Carl von Ossietzky Universität - D-26111 Oldenburg, Germany
2  Laboratoire Kastler Brossel, École Normale Supérieure - 24 rue Lhomond, F-75231 Paris Cedex 05, France

received 27 September 2006; accepted in final form 15 February 2007; published April 2007
published online 16 March 2007

Considering a two-component Bose-Einstein condensate in a double-well potential, a method to generate a Bell state consisting of two spatially separated condensates is suggested. For repulsive interactions, the required tunnelling control is achieved numerically by varying the amplitude of a sinusoidal potential difference between the wells. Both numerical and analytical calculations reveal the emergence of a highly entangled mesoscopic state.

03.75.Gg - Entanglement and decoherence in Bose-Einstein condensates.
03.75.Lm - Tunneling, Josephson effect, Bose-Einstein condensates in periodic potentials, solitons, vortices, and topological excitations.
03.75.Mn - Multicomponent condensates; spinor condensates.

© Europhysics Letters Association 2007