The Atomic and Nuclear Physics research unit conducts innovative basic research in the field of Atomic and Nuclear Physics in the broad sense : extensive studies of quantum entanglement – major ingredient in the quantum theory of information, quantum optics with cold atoms and trapped ions, dissipative dynamics of atomic systems, Bose-Einstein condensates and coherent matter-wave transport phenomena, quantum chaos, cold-atom experiments with novel atomic species (including radioactive species for the study of weak interaction), ultra-high resolution laser spectroscopy, isotopic effects on the properties of atoms, atomic metrology and development of new concepts of atomic clocks of the type of hydrogen masers for the GALILEO project, modelling of atomic structure by various relativistic approaches. These research activities involve multiple national and international collaborations and are underpinned by substantial experimental facilities (complicated laser chains, spectrometers, atomic clocks, …).

**Atomic spectroscopy and cold atom Physics (Prof. Thierry Bastin)**

The group is active theoretically and experimentally in the general field of Atomic Physics and Quantum Information Science. Experimentally, the group is active in cold atom physics (laser cooling) and atomic metrology (atomic clocks). In cold atom physics the group is focused to innovative atomic species in this field, like iron atoms, or to atomic species interesting for testing the standard model, like radioactive argon 35Ar. Theoretically, the group is active in cold atom physics and in Quantum Information Science. More specifically, the group investigates the fascinating properties of quantum entanglement (how to generate, characterize, and quantify it). These works are performed within national and international collaborations.**Quantum optics (Prof. John Martin)**

The Theoretical Quantum optics group conducts basic research in connection with the theory of open quantum systems and the theory of quantum information. Among open quantum systems, mainly atomic systems coupled to the electromagnetic field are investigated, with a special interest in cooperative phenomena (superradiance, subradiance, ...) and the interplay between atomic internal and external degrees of freedom. Other research interests include quantum entanglement in multiqubit systems, quantum chaos in simple atomic systems, such as cold atoms or Bose-Einstein condensates in kicked optical lattices, and the multifractal properties of quantum wavefunctions. The work is theoretical and involves both analytical calculations and numerically computations.**Quantum statistical physics (Prof. Peter Schlageck)**

The theoretical research group of Peter Schlagheck (PQS – Quantum Statistical Physics) is active in the general field of complex quantum systems. The group particularly focuses on the theoretical understanding and the numerical modeling of quantum transport processes with ultracold atoms and Bose-Einstein condensates. A primary objective of these research activities is to obtain a complementary insight into complex transport phenomena that generally arise in the context of electronic mesoscopic physics (such as tunneling, Anderson and weak localization, as well as interaction blockade), and to propose and guide new experiments that explore such phenomena using ultracold quantum gases. On the long-term scale, the group also aims at contributing to the realization of a quantum coherent logical circuit using transistors the functioning principle of which is based on interacting neutral atoms or molecules.

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