An experimental implementation for stabilizing Schrödinger cat states in a Kerr non-linear resonator - Part 2: Experiment.

Schrödinger cat states of microwave light based on superpositions of coherent states in a superconducting resonator are useful as error-protected qubits as well as auxiliary systems for fault-tolerant quantum computation. It has recently been shown that such states can be stabilized by applying a two-photon drive to a Kerr non-linear resonator. In this talk, we will give an introduction on this type of qubit and its potential uses in quantum computation before discussing an experimental implementation of this idea. Our system is based on a modified, low-anharmonicity, transmon qubit. Instead of a Josephson junction, we use a Superconducting Nonlinear Asymmetric Inductive eLement (SNAIL) providing us with both three- and four-wave-mixing terms. This simultaneously realizes the required non-linearity and gives us access to a strong two-photon drive. We report on this implementation and present preliminary results towards the realization of a stabilization scheme.