# Research

## Cold Atoms

Rydberg states of atoms might provide many solutions. These highly excited states have very large outer orbitals, the size of which scales as n^2 quantum number resulting in some extreme properties.

## Thermodynamics in linear Paul traps

While thermodynamic systems are generally treated by averaging over many body systems, we scale such a system down to the ultimate limit of a single quantum particle. We analyze an experimental scheme for a nano-heat engine using a single ion as working gas. An Otto cycle may be implemented by confining the ion in a linear Paul trap with tapered geometry and coupling it to engineered reservoirs. Are the classical thermodynamic laws, based on the dynamics of large ensembles, still valid for a single particle? Do they have to be modified when employing quantum reservoirs?

## Solid state quantum computer

The control of single atoms and its interactions in solid matter offers a variety of applications in quantum information processing.