  During the last ten years, superconducting circuits have passed from being
interesting physical devices to becoming contenders for near-future useful and
scalable quantum information processing (QIP). Advanced quantum simulation
experiments have been shown with up to nine qubits, while a demonstration of
Quantum Supremacy with fifty qubits is anticipated in just a few years. Quantum
Supremacy means that the quantum system can no longer be simulated by the most
powerful classical supercomputers. Integrated classical-quantum computing
systems are already emerging that can be used for software development and
experimentation, even via web interfaces.
  Therefore, the time is ripe for describing some of the recent development of
superconducting devices, systems and applications. As such, the discussion of
superconducting qubits and circuits is limited to devices that are proven
useful for current or near future applications. Consequently, the centre of
interest is the practical applications of QIP, such as computation and
simulation in Physics and Chemistry.
