Intrinsically Error Protected Superconducting Architecture Based on Superinductance*

Significant effort has been recently devoted to develop qubits with hardware-level protection, where the disjoint nature of the qubit wavefunctions offers protection against various relaxation mechanisms. Among the superconducting architectures, the so-called 0-π qubit [PRA 87, 052306 (2013)] is a promising candidate for realizing such a system. Here, we introduce the soft-0-π qubit: a twist on the original 0-π qubit proposal that relaxes some of the constraints on the qubit design parameters. In this talk, we present spectroscopic and time-domain measurements on this device. Our approach exploits an exponentially small overlap between the qubit logical wave functions and flux sweet spots to render the soft-0-π qubit noise-protected.