Peter Grünberg Institute (PGI)

In the design of quantum processors, qubit interactions are often simplified as two-body interactions, treating qubits as isolated pairs. However, extending this to multi-qubit systems requires a fundamentally new theoretical approach—not just a straightforward extension of two-qubit models. Understanding and simulating strongly interacting multi-qubit systems before building them is key to unlocking the mysteries of modern quantum physics and advancing quantum information science.

PGI Colloquium-initiated Collaboration: A long-standing physical mystery surrounding the Blatter radical has now been solved by researchers. Future applications of quantum information and information storage could benefit from this.

Forschungszentrum Jülich is playing a major role in one of the seven new Collaborative Research Centres funded by the German Research Foundation (DFG). From 1 April, four group leaders from PGI-7 (Regina Dittmann, Susanne Hoffmann-Eifert, Stephan Menzel, Ilia Valov) will be working on the development of components for future three-dimensional computer architectures in four subprojects of the SFB Transregio TRR 404 "Next Generation Electronics with Active Devices in Three Dimensions" (Active-3D) at TU Dresden and RWTH Aachen University.

Scientists from Forschungszentrum Jülich, FZJ, the University of Stuttgart, and the Leibniz Institute for High Performance Microelectronics (IHP), together with their French partner CEA-Leti, have developed the first electrically pumped continuous-wave semiconductor laser composed exclusively of elements from the fourth group of the periodic table – the “silicon group”. Built from stacked ultrathin layers of silicon germanium-tin and germanium-tin, this new laser is the first of its kind directly grown on a silicon wafer, opening up new possibilities for on-chip integrated photonics. The findings have been published in the renowned scientific journal Nature Communications.

The video about PGI-DAy 2024

In the design of quantum processors, qubit interactions are often simplified as two-body interactions, treating qubits as isolated pairs. However, extending this to multi-qubit systems requires a fundamentally new theoretical approach—not just a straightforward extension of two-qubit models. Understanding and simulating strongly interacting multi-qubit systems before building them is key to unlocking the mysteries of modern quantum physics and advancing quantum information science.