The CEO of a quantum computing company walked onto a stage at MIT and stood in front of an audience of professors, engineers and computer scientists. Vern Brownell, CEO of D-Wave Systems, looked out at the crowd and said, "I cannot explain how quantum computing works."Was he heckled? Did attendees get up and leave? No. No one in the audience stirred. There was no murmuring. Nobody laughed. No sidelong glances. Nothing. Quantum computing is just that confusing. Some of the world's best physicists don't understand how it works.