Quantum Optics of Macroscopic Systems

Quantum Optics of Macroscopic Systems


Welcome to the website of our group

Dear guests,

macroscopic bodies build the foundation of all physical experiments. Beamsplitters, mirrors and waveguides in optical experiments, wires and coils for atomic traps are only few examples. In the group quantum optics of macroscopic systems, we are interested in the influence of optical components on quantum mechanical properties of light, which can be used to transport quantum information. Quantum mechanical correlations (entanglement) can be generated by nonlinear processes and destroyed again by absorption.

Schematische Darstellung der Wechselwirkung zwischen Molekülen und Oberflächen.

In the proximity of macroscopic bodies atoms experience a force, which originates from altered quantum mechanical fluctuations of the electromagnetic field. This so called Casimir-Polder force is – besides the Casimir- and van der Waals force – an example of a purely quantum mechanical interaction with no classical equivalent. Such forces act on very short length scales (typically nm for the van der Waals forces and µm for the Casimir-Polder forces) and are thus important for the binding of molecules to each other, to nano-structures and to macroscopic bodies. Our group investigates the influence of geometric and electromagnetic properties of macrocscopic systems on those forces. This  work improves the fundamental understanding and opens a wide range of possibilities for the manipulation of atoms and molecules in the proximity of solid surfaces.

Prof. Dr. Stefan Scheel

Head of group


4th International Workshop on Rydberg Excitons in Semiconductors

Video conference - 26.-27. November 2020

Excitons – bound pairs of electrons and holes in a semiconducting material – can be produced in excited internal states by means of laser excitation. More than 60 years after their discovery in cuprous oxide semiconductors, the investigation of such Rydberg excitons is currently attracting increasing world-wide interest due to their vastly exaggerated properties. Just like for their atomic counterparts, the enhanced external-field sensitivity and strong mutual interactions of such Rydberg states makes them attractive systems for fundamental studies of basic quantum phenomena and suggests exciting opportunities for future applications, such as nonlinear optical interfaces.

 

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