Fabricating Tantalum Resonators for an Inductively Shunted Transmon (IST)

In superconducting quantum circuits, tantalum (Ta) has recently been shown to exhibit lower loss compared to conventional materials such as niobium (Nb), due to its unique material properties. The transmon, a type of superconducting qubit, consists of a nonlinear LC circuit formed by a Josephson junction and a capacitor. It is coupled to a linear LC circuit that serves as a readout resonator. In this talk, I will discuss the fabrication procedure and characterization of a coplanar waveguide (CPW) readout resonator using Ta. I will then talk about how this can be applied to an inductively shunted transmon (IST). This transmon configuration offers noise protection and a novel method of frequency tunability, making it a promising candidate for next-generation superconducting qubit design.