Aarhus University

Description of the Institution

Aarhus University (AU) was founded in 1928. It has 42,500 students, about 1,900 PhD, and close to 900 postdoctoral scholars together with 11,500 employees. Internationalisation is a key part of AU’s mission and it continuously works to strengthen the international profile of the University through numerous initiatives. AU has been establishing itself as a university for cutting-edge research, and has been moving up the most important university ranking lists (currently #109 of the 17,000 universities on the Times Higher Education World University Ranking).

The Department of Physics and Astronomy has a strong quantum research program, which covers complementary theoretical and experimental activities from quantum optics and optomechanics to cold ion and ultracold atom research.


Description of Main Tasks and Participant’s Profile

AAR has established a number of key concepts and ideas underlying the use of Rydberg-atom ensembles for quantum nonlinear optics. Building on this profound expertise, the group works out new protocols for highly few-photon nonlinearities with unprecedented coherence properties and thereby contribute a vital component to the project. This includes the development of theoretical approaches to the quantum dynamics of few- and many-photon states to identify major de-coherence mechanisms in currently employed schemes and to conceive new strategies to overcome such limitations. Previously, AAR has employed elaborate numerical schemes to examine manifestations of photon interactions in Rydberg ensembles within the frame of several experimental collaborations. Drawing from this experience the group implements realistic numerical simulations for accurate performance benchmarks of nonlinear optical-device operations in strong support and close collaboration with the experimental efforts. In addition, AAR leads the theory efforts and, in the course, contributes its theoretical expertise beyond the physics of Rydberg ensembles, e.g., from the group’s recent work on surface-trapping and optical coupling of cold atoms on optical waveguide chips.

Leading Researchers 

  • Prof. Dr. Thomas Pohl
    Principal Investigator

    PhotoCredit: ErBeStA / Sebastian Pucher