Suspended Superinductors for Novel Qubits

Superinductors based on Josephson junction arrays are a key circuit element for novel superconducting qubits, such as fluxonium, 0-pi, and blochnium qubits. However, dissipation in superinductors due to intrinsic noise sources, such as dielectric loss or parasitic capacitance from the substrate, limits the performance of these elements. In this talk, we present state-of-the-art design and fabrication techniques to realize superinducting circuit elements based on suspended Josephson junction arrays and analyze their performance. Furthermore, we utilize this technique to create a novel suspended fluxonium type of qubit and investigate its characteristics.