Berlin 2005 – wissenschaftliches Programm

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Q: Quantenoptik und Photonik

Q 41: Quantengase II

Q 41.3: Vortrag

Dienstag, 8. März 2005, 15:30–15:45, HU Kinosaal

Time evolution of a freely falling BEC — •Gerrit Nandi, Reinhold Walser, and Wolfgang P. Schleich — Abteilung für Quantenphysik, Universität Ulm, Germany

A freely falling Bose-Einstein condensate (BEC) provides a novel experimental configuration for fundamentally new studies of the nature of the BEC order parameter. Such microgravity experiments can be realized in drop towers or space. We study freely falling degenerate bosons or fermions, confined in a time-dependent harmonic trap, with two internal states in the co-rotating frame of the earth. It is possible to eliminate all non-inertial forces via a transformation to a non-rotating freely-falling frame [1-3]. In this context, we investigate a superfluid vortex in a macroscopic superposition with a non-rotating ground state, prepared in two distinguishable internal states of a BEC. This configuration acts as a quantum gyroscope [4] and can be used for high-precision measurements.

[1] J. F. Dobson, Phys. Rev. Lett. 73, 2244 (1994).

[2] I. Bialynicki-Birula, and Z. Bialynicka-Birula, Phys. Rev. A 65, 063606 (2002).

[3] G. Nandi, R. Walser, and W. P. Schleich, in preparation.

[4] S. Stringari, Phys. Rev. Lett. 86, 4725 (2001).