Chaotic dynamics of a Bose-Einstein condensate coupled to a qubit

Details Chaotic dynamics of a Bose-Einstein condensate coupled to a qubit Chaotic dynamics of a Bose-Einstein condensate coupled to a qubit

2008-12-30

arxiv.org/abs/0812.5067v1

Phys. Rev. E 79, 066205 (2009)

Physics

Condensed Matter

Statistical Mechanics

4 pages, 6 figures. Research done at http://www.quantware.ups-tlse.fr/

Scientific paper

10.1103/PhysRevE.79.066205

We study numerically the coupling between a qubit and a Bose-Einstein condensate (BEC) moving in a kicked optical lattice, using Gross-Pitaevskii equation. In the regime where the BEC size is smaller than the lattice period, the chaotic dynamics of the BEC is effectively controlled by the qubit state. The feedback effects of the nonlinear chaotic BEC dynamics preserve the coherence and purity of the qubit in the regime of strong BEC nonlinearity. This gives an example of an exponentially sensitive control over a macroscopic state by internal qubit states. At weak nonlinearity quantum chaos leads to rapid dynamical decoherence of the qubit. The realization of such coupled systems is within reach of current experimental techniques.

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