On chip oscillator for quantum applications

Important results from the project

The initial objectives are considered fulfilled. The project established a design and a manufacturing process for Josephson-based on-chip oscillators intended to drive TWPAs in a cryogenic environment, and prototype chips were designed and fabricated. Beyond the main result, the project strengthened the modelling and simulation basis and provides a clear foundation for continued development towards TWPA integration in a future product generation.

Expected long term effects

The project is expected to enable more compact, cost-effective, and scalable cryogenic quantum systems by replacing external microwave pumping with an on-chip pump powered by DC. This reduces the need for expensive microwave sources and extensive AC cabling in the cryostat, simplifies integration of more amplifier channels, and supports scale-up. The results also strengthen Swedish/European competence and IP and may create new product opportunities.

Approach and implementation

The project was carried out in close collaboration between Chalmers and WACQT-IP, following a planned workflow from theory to prototype. The work included project management, theoretical modelling and simulation of the Josephson oscillator, and preparation of input for a manufacturing process for oscillators intended to drive TWPAs in a cryogenic environment. During the project, WACQT-IP’s role was transferred to the spin-off company QET Sweden to enable future commercial exploitation.