The Dahlem Center for Complex Quantum Systems focuses on quantum transport and the quantum theory of solid-state physics. It is also dedicated to exploring the foundations of future technologies. Quantum systems harbor the potential for transformative innovations, such as laser technologies, microchips, and nanotechnology.

Complex quantum systems, as physical entities, consist of many particles whose behavior is governed by the laws of quantum mechanics. This field investigates a wide range of phenomena, including quantum transport, nanomagnetism, mesoscopic superconductivity, quantum chaos, strongly correlated electron systems, complex materials, atomic gases, quantum measurement, computing, and information theory.

To enhance our understanding of many-body systems—such as solids—their behavior can be modeled using so-called quantum simulators, for example by employing lasers with adjustable strength and wavelength. These simulations allow researchers to draw conclusions about the behavior of real solid-state systems.

Another research focus is the theoretical description of quantum systems with multiple degrees of freedom and their properties. Systems from solid-state physics are used for this purpose. Theoretical mesoscopic physics, a subfield of condensed matter physics, examines the properties of electronic systems where quantum mechanics and diffusion intersect. Examples include semiconductor or metallic wires, metallic nanoparticles, carbon nanotubes, and semiconductor quantum dots. Similar quantum effects are also studied in systems where microwaves or light undergo frequent scattering.

Research into the fundamental principles of electron transport through individual molecules, as well as magnetic interactions between molecules and metallic or superconducting surfaces, may contribute to the development of future technologies—particularly in electronic circuits and data storage.