Speaker's Brief Introduction： Klaus Mølmer was born in 1963. He obtained his PhD at the University of Aarhus, Denmark in 1990 and was postdoc at the Mac Planck Institute for Quantum Optics in Germany 1992-1993. He was associate professor 1991-2000 and full professor 2000-2022 in Aarhus and since 2022 at the Niels Bohr Institute, University of Copenhagen, Denmark. As a theoretical physicist, he has developed key concepts for quantum computing gates with ions, atoms and photons and he has contributed to the understanding and application of dynamics, dissipation and measurements in quantum mechanics and quantum optics. He has popularized science in numerous talks and articles as well as in a Danish textbook on Quantum Mechanics, and he has contributed to “quantum composition” of music and stage performances with composers, musicians, ballet dancers and other artists.
Abstract: With the scaling of quantum technologies to many separate material quantum components, we may have to couple these systems by propagating quantum radiation, in the form of light, microwaves or phonons. In future optical quantum processors, we may, conversely, need to manipulate the quantum states of radiation pulses by their interaction with non-linear stationary quantum components. Several physical processes have been proposed and already demonstrated for these tasks. There are, however,rather fundamental obstacles to the treatment of propagation of radiation in circuits for quantum computing. These obstacles include the general multimode character of propagating fields and the duration and spatial extent of useful light and microwave pulses. The talk will review recent developments of a cascaded master equation approach to deal theoretically with these obstacles, and it will present examples of new, unforeseen, possibilities for easy preparation and manipulation “on the fly” of quantum states of light and matter.