Quantum computers, in a nutshell, will be able to perform tasks much, much faster than typical computers by harnessing the power of atoms and molecules. It's a complex topic, but Canadian Prime Minister Justin Trudeau might be able to help you out. The technology is still in its infancy, but a few organizations, including Google and MIT, managed to create simple versions that could lead something bigger.
As you can imagine then, a quantum computer and an AI make a formidable combination. During the event, Rubin said the resulting machine could be so powerful, we'd need only one to power every connected device, such as smartphones. "If you have computing that is as powerful as this could be, you might only need one. It might not be something you carry around; it just has to be conscious," he said, according to The Verge.
The idea of an extremely capable and conscious computer is both intriguing and terrifying. Remember Skynet? Rubin said we shouldn't "be worrying about Skynet coming online," though. We "should be worrying about what it means to compute at these magnitudes."