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Quantum Many Body Systems

Interacting quantum many-body systems pose some of the most outstanding challenges in quantum physics, with researchers around the world working to understand such systems and to engineer and exploit them for quantum information purposes. At CQT, we address both the theoretical study and experimental realisation and control of such systems using ultracold atomic quantum gases and strongly correlated systems of photons.

In the case of ultracold gases, we probe the quantum behaviour of degenerate gases of bosons and fermions held in optical and magnetic traps. We also consider the effects when controlled periodic potentials are added in the form of optical lattices. Specifically, we study the many body phases of quantum degenerate Fermi gases with cold atoms and cold ensembles in optical lattices (experiment and theory), mesoscopic ultra-cold bosonic ensembles in optical traps and atom chips, and cold Rydberg gases in optical lattices.

In parallel, we are theoretically exploring a new direction: looking at how the interaction between cold atomic gases and quantum light pulses can result in strongly correlated quantum many-body states of photons, and at what application such states may have in condensed matter and quantum information (see here). For example, as well as providing insight into the fundamental physics of ultra-cold matter and its interaction with light, these artificial and highly-controllable systems may serve as a platform for generating and understanding complex condensed-matter phenomena such as quantum phase transitions.

Theory Group

Dimitris Angelakis

Experimental Group

Kai Dieckmann
Wenhui Li