This paper provides an overview of the economic impact of quantum technologies. The goal is not to be exhaustive but rather to describe an up-to-date panel of stakes, challenges and figures that remains accessible to non-expert readers who wish to understand the priorities of the so-called quantum revolution. In a first part, the paper reminds the fundamentals of quantum physics (though not entering into technical details). Then in section 2, the benefits of different quantum technologies are challenged and/or illustrated. Section 3 puts in light the main steps that are required in order to economically benefit from the quantum; three axis are identified: education of skilled people, strategy for innovation ecosystem, and standardization. Section 4 concludes by giving some figures on funding efforts made by countries around the world and by pointing out some limitations to overcome.