Si-based Josephson field-effect transistors

Important quantum technology applications are made possible by superconducting electronics. These devices are governed by similar laws as day-to-day electronic components, but with the important addition of dissipationless electric currents, governed by a quantum variable: superconducting phase. In superconducting circuit design, superconducting phase has been primarily established in loops, and manipulated through externally-applied magnetic fields. The resulting components are slow and difficult to miniaturize: for a quantum computer processor this limits the capabilities that can be achieved. In this project we integrate superconducting materials into silicon transistors to allow them to control the flow of superconducting currents and their associated quantum phase. We expect this approach to be fast, low-powered and with minimal surface footprint. This approach is very promising for integration with existing electronics, in a new paradigm of superconducting circuit design.

Contact: Alberto Ronzani