Superconducting Quantum Circuits for Quantum Computing and Quantum Simulation

Quantum research has undergone a remarkable transition from probing quantum phenomena intrinsic to nature, to developing engineered and fully controllable quantum systems with new functionality. Experimental capabilities to reach milli-Kelvin temperatures have played an important role in enabling new quantum technology. An exciting example of such low-temperature quantum devices are superconducting circuits which have facilitated impressive progress towards quantum computation and quantum simulation. I will review the journey from the early superconducting qubits to presently employed circuits with coherence times in the micro- to millisecond range, and discuss the ongoing development of even more robust superconducting qubits with intrinsic error protection. These next-generation circuits, including the heavy-fluxonium and 0-π qubits, have the potential to outperform and ultimately replace the widely used transmon qubit.