There are many devices available which rely on quantum mechanical effects and have revolutionized society through medicine, optical communication, high-speed internet, and high-performance computing, just to mention a few examples. After the technological advances that brought us lasers, MRI imagers and transistors, a second wave of quantum technologies is expected to impact society in a similar way. These new technologies are expected to make use of quantum coherence, relying upon the progress achieved in the last century in understanding and controlling atomic-scale systems. Quantum mechanical effects are used as a resource in novel technologies with far-reaching applications, including quantum sensors and novel imaging techniques, secure communication (quantum internet) and quantum computing.