PhD in cavity quantum electrodynamics with ion crystals

Ion Trap Group at the Department of Physics and Astronomy, University of Aarhus, Denmark

You will work on experimental cavity QED with laser-cooled ensembles of trapped ions (ion Coulomb crystals) and study their interaction with optical fields at the single photon level.

Job description

The efficient storage and retrieval of photonic states is at the core of many quantum information and communication protocols. Having an excellent control on the photonics modes and the light-matter coupling will be essential e.g. for reaching the high-fidelity levels required for practical implementations of quantum memories and repeaters. In this respect, ion crystals placed in an optical cavity represent a near-ideal multimode storage medium on account of their excellent temporal stability, the good localization of the ions in the crystal and their controllable coupling to light fields. Within the present project multimode storage and retrieval of light states encoded in various degrees of freedom will be experimentally investigated. Protocols involving e.g. transverse and longitudinal cavity modes will be studied, taking advantage of the localization of the uniformly distributed ions in the crystal. To this aim, methods to further localize the ions and control the ion crystal structure using light forces will be developed. Moreover, the possibility to coherently address
collective motional modes of the ions will be investigated by e.g. studying the optomechanical coupling between light fields and specific vibrational modes of the crystal. Combined with the traditional frequency and polarization encoding of quantum information, this unique system should allow for fully exploiting the potential of ensemble-based quantum memories and lead to the development of novel non-classical light sources.

About the Ion Trap Group at Aarhus

The (experimental) project will be realized in the Ion Trap Group at the University of Aarhus headed by Prof. Michael Drewsen, with theoretical collaborations with the Quantum Optics Theory group of Prof. Klaus Mølmer as well as with other partners of the network.


The applicants should send a full CV including relevant diploma certificates, a letter of motivation (1 page) and the contact details of one referee to drewsen@phys.au.dk.