Diamond Materials

Diamond Materials for Quantum Application

23. September 2014: The DFG research group FOR 1493 “Diamond Materials and Quantum Applications” goes into its second funding period. FOR1493 is a national research consortium funded by the Deutsche Forsch-ungsgemeinschaft.

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ERC Advanced Grant


Magnetooptics of rare earth systems

Rare earth ions in solid host materials are famous because of their unique optical behavior. A characteristic property of the trivalent rare earth ions is that their electronic transitions usually occur within the 4f shell, which is somewhat shielded from the host lattice by the optically passive outer electronic shells. (Ce 3+ with its 5d—4f transitions is an exception.) This reduces the influence of the host lattice on the wavelengths, bandwidths and cross sections of the relevant optical transitions. As a result rare earth elements, most notably Europium is found to be a key ingredient in in modern optoelectronics. The very same property makes those ions very attractive candidates for solid based quantum optics.

Some of the most significant advances in quantum information processing have been made using quantum optics-based techniques. To proceed further it is necessary to develop techniques whereby quantum information can be exchanged in a controlled fashion between light fields and material systems. Rare earth ion doped present attractive systems for doing this because of the lack of atomic movement and the long coherence times. When storing quantum states from light onto a transition of atom-like systems, the coherence time of that transition is all important as it specifies how long the quantum state can be stored. The long coherence times have enabled to demonstrate EIT-based stopped light with storage times of number of seconds.

Research in the institute is directed towards using rare earth ions in solids for a controlled generation of quantum states, as switchable magnetic systems or to demonstrate coherent multi beam coupling phenomena like e.g. EIT.