Summary: This is the second in our multi-part series on Quantum computing. How Fast?" we laid out the case that Quantum computing is commercially available today and that companies are already beginning to use it in operations. We talked a little about who is out in front (D-Wave, IBM) and who is coming soon (Microsoft, Google, University of New South Wales). We also spoke briefly about how it might be applied to deep learning and have an impact on artificial intelligence. In commercial operation today there are two distinct types of Quantum computers and several entirely different types due within a year or two.