Low-noise amplifier for quantum signals As part of the Nano-Argovia project QAmp, researchers from the start-up YQuantum, the Paul Scherrer Institute PSI and the University of Basel are working together on a key building block for the next generation of quantum computers: extremely low-noise amplifiers for quantum signals. Signal amplification At the heart of this technology is a “traveling-wave parametric amplifier” (TWPA), which is needed to convert weak signals from quantum computers into classical electrical signals — with the least possible additional noise. The aim of the project is to develop an amplifier that has as little physical influence on the signals as possible and therefore allows the pre- cise and scalable reading of qubits. Led by Professor Christian Schönenberger and Professor Andrea Hofmann (Department of Physics, University of Basel), the team is working with indus- try partner YQuantum to develop a new generation of these amplifiers. The devices are based on super- conducting Josephson junctions and use specially developed low-loss structures to amplify signals as efficiently as possible. This work benefits from the partners’ complementary areas of expertise: While the University of Basel handles the characterization of the amplifiers at extremely low temperatures, PSI works with the PICO clean room infrastructure to facilitate production on 8-inch silicon wafers — a major step toward the integration of numerous com- ponents in an extremely small space. Within two years, this ambitious project aims to produce market-ready amplifiers that are not only more compact than current systems but also operate much closer to the absolute quantum noise limit. This should allow the reliable reading of 1,000 qubits — a vital step in the further development and scal- ability of quantum computers. Collaboration between: University of Basel Paul Scherrer Institute YQuantum (Villigen) Further information: Nano-Argovia program Research group A. Hofmann, University of Basel PSI YQuantum “With support from the Nano-Argovia project, we’re able to achieve significant advances in the development of a novel quantum amplifier by working hand in hand with strong partners from the University of Basel and PSI. This promising system is well on the way to becoming a vital product in our portfolio.” Dr. Christian Jünger, YQuantum Nano-Argovia Project 10 SNI INSight June 2025