A Post Doc. position in theoretical quantum optics is available at the Niels Bohr Institute in Copenhagen, Denmark. The position is for research into one of the following two areas:

1) Engineering single photon non-linearities with atomic ensembles. Photons are normally weakly interaction with each other. The construction of single photon non-linearities where single photons interact strongly with each other is an outstanding challenge in quantum optics [1,2]. Here we will explore the possibility of constructing and applying single photon non-linearities either using Rydberg interactions in atomic ensembles or atoms weakly coupled to waveguides.

2) Suppressing the decoherence of quantum dots with tailored nanostructures. The dephasing of the optical transitions of self assembled quantum dots is a major obstacle to quantum dot research. Here we will explore methods for suppressing this decoherence by engineering nanostructures around the quantum dot which reduces the phonon fluctuation at the position of the dot.

The project will be partially funded by a new ERC starting grant for research in Quantum interfaces and Open Systems. The position will thus be part of a flourishing research environment. The research of the group focuses on the implementation of quantum information processing in a wide range of systems, ranging from quantum optical systems such as atoms and photons to solid state systems. The research especially focuses on coherent interfaces between light and matter. In addition we have a smaller program on ultra cold atoms. For information on the group please see http://www.nbi.ku.dk/forskningsgrupper/kvanteoptik/english/qopticstheory/ or contact Prof. Anders S. Sørensen, anders.sorensen@nbi.dk for further questions. We seek excellent candidates and offer research opportunities at the forefront of quantum optics in a stimulating international environment with an attractive salary.

The applicant should have a Ph.D. degree in physics or a related subject, preferable with experience in quantum optics. Ideally the candidate should have experience with theories related to the projects. Applications should include a CV, the names and contact information of up to three references, and a description of research interest. As an equal opportunities employer, the University of Copenhagen invites applications from all interested candidates, regardless of gender, age, religion, or ethnic origin.

The deadline for applications is October 18th, 2012. The starting date of the position can be any time in the first half of 2013. The position is for two years.
Applications should be submitted electronically at the address listed under "Employer web page"

[1] A single-photon transistor using nanoscale surface plasmons, D. E. Chang, A. S. Sørensen, E. A. Demler, and M. D. Lukin, Nature Physics 3, 807 (2007).
[2] Photon sorters and QND detectors using single photon emitters, D. Witthaut, M. D. Lukin, and A. S. Sørensen, Europhys. Lett. 97, 50007 (2012).