Oral: Towards autonomous quantum error correction in a four-photon Kerr parametric oscillator

This presentation discusses an autonomous quantum error correction scheme for a rotational symmetric bosonic code in a four-photon Kerr parametric oscillator (KPO). Our scheme is the simplest possible error correction scheme that can correct single-photon loss using a single continuous microwave tone. We also introduce an unconditional reset scheme that requires one more continuous microwave tone in addition to that for the error correction. The key properties underlying this simplicity are engineering the degeneracy in the energy level structure of a four-photon KPO and employing an ancilla resonator. For experimental implementation, we make a KPO driven by a three- or four-photon pump and directly measure the Wigner function of its eigenstates.