  Within the last two decades, Quantum Technologies (QT) have made tremendous
progress, moving from Noble Prize award-winning experiments on quantum physics
into a cross-disciplinary field of applied research. Technologies are being
developed now that explicitly address individual quantum states and make use of
the 'strange' quantum properties, such as superposition and entanglement. The
field comprises four domains: Quantum Communication, Quantum Simulation,
Quantum Computation, and Quantum Sensing and Metrology.
  One success factor for the rapid advancement of QT is a well-aligned global
research community with a common understanding of the challenges and goals. In
Europe, this community has profited from several coordination projects, which
have orchestrated the creation of a 150-page QT Roadmap. This article presents
an updated summary of this roadmap. Besides sections on the four domains of QT,
we have included sections on Quantum Theory and Software, and on Quantum
Control, as both are important areas of research that cut across all four
domains. Each section, after a short introduction to the domain, gives an
overview on its current status and main challenges and then describes the
advances in science and technology foreseen for the next ten years and beyond.
