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Classical computers require enormous computing power and memory to simulate even the most modest quantum systems. That makes it difficult to model, for example, why certain materials are insulators and others are conductors or even superconductors. R. Feynman had grasped this since the 1980s and suggested to use instead another more controllable and perhaps artificial quantum system as a “quantum computer” or specifically in this case a “quantum simulator”. In this direction, we study and develop novel approaches in a variety of quantum platforms including superconducting quantum circuits, slow light and integrated photonic waveguide arrays. We also work with cold atoms and ions every now and then. Beyond quantum simulation and computation, we are also interested in topological physics as well as driven-dissipative quantum systems in general.
Our work is highly interdisciplinary and spans areas such as quantum optics, nano-photonics, condensed matter physics, as well as quantum information science. We are in active collaboration with worldleading experimental groups to realise our ideas
Working examples of quantum simulator technologies today include extremely cold atoms trapped with lasers and magnetic fields and ions in electromagnetic traps. Photons and polaritons in light-matter systems have also recently emerged as a promising avenue and we are happy to be one of the leading groups in this area. With photons, exotic phenomena thought to exist only in strongly interacting electronic systems, such as Mott transitions, Fractional Hall effect, spin-charge separation, interacting relativistic theories , many-body localization and topological physics can be reproduced and understood in more detail. In addition to the “many-body stuff”, he is also interested in the “few body” quantum effects found in nano-structures and cold ions systems interfaced with light. These hybrid systems are extremely interesting for the study of quantum effects like quantum interference and entanglement and for their potential use in building quantum memories and quantum processors. My work is mainly theoretical but we keep close contact with various experimental groups.