Düsseldorf 2007 – scientific programme

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A: Fachverband Atomphysik

A 12: Poster I - Interaction with external fields

A 12.2: Poster

Tuesday, March 20, 2007, 16:30–18:30, Poster B

Berry phase in atomic scattering — •Polina V. Mironova, Maxim A. Efremov, and Wolfgang P. Schleich — Institut für Quantenphysik, Universität Ulm, Ulm, Germany

The Berry phase is determined only by the topology of parameter space and therefore cannot be disturbed by noise. It could be of use for the construction of robust quantum gates. We consider the scattering of a two-level atom by a resonant standing light wave. In our scheme an atom interacts with (i) the standing wave, (ii) the pi-pulse, (iii) the second standing wave which is identical to the first one, and (iv) the second pi-pulse. In the adiabatic approximation of the atomic center-of-mass motion, an adiabatically slow switch-on and -off of the atom-standing wave interaction we shown that we can controll the atomic state population at each moment of the interaction. We suggest a four-step scheme of atom scattering will lead to cancelling of the dynamical phase and the scattering picture will be determined only by the position-dependent geometrical phase.