Surface Quantum Optics

Abstract

Hybrid quantum systems are the subject of extensive research worldwide. The great interest in these systems is motivated mainly by the prospect of coherent interactions and entanglement between the individual units. This requires precise control over the involved quantum systems. Presently, the best control over quantum matter is achieved with clouds of ultracold atoms. They can be isolated from the surroundings in miniaturized magnetic and optical traps on atom chips and thus suffer very little intrinsic decoherence. However, strong coupling of atoms with optical fields typically requires the storage of optical excitations in ultrahigh-finesse cavities.

The surface quantum optics group in Tübingen pursues a complementary approach which is based on the interaction of ultracold atoms with surface plasmons. It is based on the generation of surface traps for cold atoms close to plasmonic nanostructures in order to enable cooperative coupling between single atoms and single plasmons. Along this way physical effects have to be investigated like Casimir Polder forces which are typically strongly attractive and can lead to the loss of atoms from the trap. I will report on our experiments with cold atoms at submicron distances from solid surfaces with integrated plasmonic structures.

Data: 24 de março

Hora: 11 h (será servido um pequeno lanche às 10:30 h)

Local: Instituto de Física - Sala 343-A

Sebastian Slama

Eberhard Karls Universität Tübingen