Multi-mode architectures for noise-resilient superconducting qubits

Abstract Great interest revolves around the development of new strategies to efficiently store and manipulate quantum information in a robust decoherence-free fashion. Several proposals have been put forward encode into qubits that are simultaneously insensitive relaxation dephasing processes. Among all, given their versatility high-degree control, superconducting largely investigated this direction. Here, we present survey on basic concepts ideas behind implementation novel circuits with intrinsic protection against decoherence at hardware level. In particular, main focus is multi-mode circuits, paradigmatic example being so-called 0 ? ? circuit. We report working principle possible physical implementations based conventional Josephson elements, presenting recent experimental realizations, discussing both fabrication methods characterizations.