1. Department of Theoretical Physics, Institute of Physics, Budapest University of Technology and Economics, Műegyetem rkp. 3., H-1111 Budapest, Hungary
2. HUN-REN–BME Quantum Dynamics and Correlations Research Group, Műegyetem rkp. 3., H-1111 Budapest, Hungary
3. Department of Physics, Stockholm University, AlbaNova University Center, 106 91 Stockholm, Sweden