High Kinetic Inductance Based Fluxonium Circuit

Inductively shunted Fluxonium circuits have shown promise as long lived qubits. The large inductance needed in the Fluxonium circuit has been achieved using Josephson junction arrays which have several desirable features such as ease of fabrication and small physical footprints. However, the self resonant modes of large Josephson junction arrays set a practical limit for how large of an inductance can be achieved. Using high kinetic inductance materials to fabricate superinductors is one possible solution. Here, we fabricate and measure a fluxonium circuit containing a NbTiN superinductor to demonstrate that these materials can be integrated into standard superconducting circuit fabrication processes.