Generating Schrödinger-cat states in momentum and internal-state space from Bose-Einstein condensates with repulsive interactions

Details Generating Schrödinger-cat states in momentum and internal-state space from Bose-Einstein condensates with repulsive interactions Generating Schrödinger-cat states in momentum and internal-state space from Bose-Einstein condensates with repulsive interactions

2003-10-23

arxiv.org/abs/cond-mat/0310573v1

Physics

Condensed Matter

Statistical Mechanics

7 pages, 3 figures. Submitted to PRA

Scientific paper

10.1103/PhysRevA.69.053605

Resonant Raman coupling between internal levels induced by continuous illumination of non-collinear laser beams can create double-well momentum-space potentials for multi-level ``periodically-dressed'' atoms. We develop an approximate many-body formalism for a weakly interacting, trapped periodically-dressed Bose gas which illustrates how a tunable exchange interaction yields correlated many-body ground states. In contrast to the case of a position-space double well, the ground state of stable periodically-dressed Bose gases with repulsive interactions tends toward a Schr\"{o}dinger cat state in the regime where interactions dominate the momentum-space tunnelling induced by the external trapping potential. The dependence of the momentum-space tunnelling and exchange interaction on experimental parameters is derived. We discuss how real-time control of experimental parameters can be used to create Schr\"{o}dinger cat states either between momentum or internal states, and how these states could be dynamically controlled towards highly sensitive interferometry and frequency metrology.

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