Quantum mechanics is perhaps the most profound revolution ever to occur in our understanding of Nature. While born with last century, it appeared for many decades to be just a game, played by physicists strictly for the sake of advancing pure knowledge, without any impact on everyday life. And then, quantum mechanics gave birth to the transistor, and society was transformed forever. The physicists’ “game” ushered in the Information Age, which is the signature of the 20th century, just as the 19th century was the Machine Age. But we are poised to experience a second quantum revolution in which the full power of the quantum world will be unleashed in ways never before thought possible, transmitting and processing information with unconditionally secure communication and computers powerful beyond imagination. Indeed, the 21st century will go down in history as the Quantum Age.