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Our mission is to investigate complex quantum systems, engineer novel devices and educate students to advance quantum technologies for scientific and societal impact.

Technological progress goes hand in hand with incessant advances in computing power. Modern personal electronic devices have the computational power of a supercomputer from just a decade ago. Computer-aided designs, logistics, data analysis and cognitive computing have become an essential part of modern life. However, current progress in down-scaling transistors reaches physical limits when approaching atomic scales, and heat dissipation becomes a severe issue with increasing transistor densities.

Above all, certain complex physical problems such as computing energy spectra, correlations or time dynamics in molecular and condensed matter systems are beyond the reach of classical computers. Because of the exponential growth of Hilbert space with the number of particles, such computations require exponential resources preventing the computation of realistic systems.

A quantum computer may provide the means to compute ground-state energies, energy spectra, time dynamics and correlations of such systems efficiently. It is even expected that certain types of optimization problems with application in logistics, time-scheduling and others could be solved more efficiently with the help of quantum effects.

In our experiments, we use superconducting qubits, which can be manipulated on short time scales with respect to their coherence times within a cryogenic environment. Thanks to the relatively simple and reliable fabrication there exists a clear path towards a scalable architecture to realize the building blocks of a future quantum computer.

As a main focus we are exploring qubit–qubit coupling schemes based on parametrically driven tunable couplers to achieve high-fidelity interactions between highly coherent superconducting qubits. As a potential application we explore quantum neural networks using adiabatic manipulation protocols.

Within the QuSCo European training network, we are exploring optimal control and calibration schemes for single and two-qubit devices.