## Second SCL seminar by Nikola Buric

Nikola Buric gave a second seminar on his recent work entitled "Pure state dynamics of open quantum systems and quantum control". The main topic of the talk was the QSD method which can be efficiently used to study entanglement dynamics in strongly entangled qubit chains of moderate length in realistic conditions. Prof. Buric showed the relation between the qualitative propagation of entanglement evolution and the symmetry of the quantum system, and a relation between the qualitative propagation of entanglement evolution and the QI and QC of the quantum system (which depend on the properties of the initial state). He also discussed how geometric properties of the ( quantum state) diffusion metric, e.g. the curvature, are indicators of asymptotically stable states, and in classical mechanics sufficient symmetry is (almost) synonimous with complete integrability, and the lack of symmetry implies classical chaoticity. In the quantum case the relations are more subtle.