Düsseldorf 2007 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 44: Ultrakalte Atome (Manipulation und Detektion)

Q 44.3: Talk

Wednesday, March 21, 2007, 14:30–14:45, 5D

Resonant quantum tunneling via vacuum-multiparticle interactions — •Mihai Macovei — Max-Planck Institute for Nuclear Physics, Heidelberg.

The tunneling of matter wave packets through different types of traps and barriers attracted a lot of attention due to a possible design of an atomic soliton laser or a velocity selector for ultracold particles.

Here, we demonstrate that a slow-velocity excited particle tunnels freely through a vacuum electromagnetic field cavity mode filled with N-1 ground state atoms [1]. The reason for this is the trapping of the moving atom into its upper state due to multiparticle influences and the corresponding decoupling from the interaction with the environment such that the quantum state of the emitter is frozen when it passes through the vacuum-induced potentials.

[1] Mihai A. Macovei, submitted; quant-ph/0610126.