Innovation area - Information processing for quantum technology | Photonic systems for quantum control and information processing 

Superconducting transparent thin films for quantum technologies

Modern quantum technologies often combine optical and microwave signals. On-chip integration then asks for materials that are both optically transparent and good microwave conductors. Indium tin oxide (ITO), a transparent conductive oxide widely used in displays and photovoltaics, represents a promising platform for addressing this challenge. In this collaborative project, we aim to establish superconductivity as novel functionality for transparent ITO thin films for quantum technology applications. When cooled into a superconducting state, the conductivity of ITO drastically increases. This allows completely new parameter ranges when optical transparency and dc or microwave conductivity have to be optimized with respective tradeoffs. The project combines the expertise in the deposition of ITO thin films (Jena) with the experimental (Stuttgart) and theoretical (Ulm) investigation and quantitative description of the electronic and electrodynamic properties of disordered superconductors.