Theoretical Nanoelectronics

The quantum mechanical nature of matter is the basis of all functioning of electronic devices. We use techniques from many-body physics, from quantum statistical physics, and from the mathematics of topology, to analyze the properties of electrons and other state-of-the-art physical platforms for quantum technology in a wide range of present-day exploratory devices. Our work can enable the development of new qubits, protocols for quantum error correction and quantum fault-tolerance, and new approaches to building scalable quantum computers.

Director: Prof. Dr. David DiVincenzo

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Quantum Computing

Using the Electron Shuttle to Create a Scalable Quantum Computer

A major challenge in building a quantum computer is its scalability, i.e. the ability to connect millions of qubits. In contrast to semiconductor chips in conventional computers, quantum chips cannot simply be enlarged. Researchers from the JARA cooperation between Forschungszentrum Jülich and RWTH Aachen University as well as the Polish Academy of Sciences were able to make progress compared to previous demonstrations using the electron shuttle method. The results were published in Nature Communications.

Peter Grünberg Colloquium: Prof. Dr. Lorenzo Maccone, Università degli Studi di Pavia & Istituto Nazionale di Fisica Nucleare, Sezione di Pavia, Italy

Quantum metrology is one of the pillars of quantum technologies. It shows how one can use quantum effects, such as entanglement and squeezing, to increase the precision of the measurements one can do. It also establishes the ultimate bounds, on precision that any measurement can achieve, e.g. through the Heisenberg uncertainty relations and the quantum speed limits.

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