Professor Sandu Popescu and Professor Jeremy O'Brien, School of Physics, University of Bristol www.bristol.ac.uk/science/courses/undergraduate/ The theory of quantum mechanics has been hotly debated for over 100 years as our best description for the entire physical world. But the behaviour of small particles is extremely unusual and defies the natural instinct to judge the world of objects based on what is visible to the human eye. In the first part of this lecture, Professor Popescu, credited with establishing some of the central concepts in quantum information and computation, presents the basic ideas of this paradoxical theory. Professor O'Brien, Director of Bristol's Centre for Quantum Photonics and a renowned expert in quantum technology, goes on to explore how we can harness quantum mechanics to realise profoundly new technologies, from a super computer to cleaner energy devices.