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A wonderful overview of the history and science of this extraordinary new discipline. Brown's documentary approach interlaces explanations of quantum computers with comments from the pioneers of this field including David Deutsch and Richard Feynman. It makes for riveting reading with many witty asides thrown into some far-sighted discussions of where the subject is leading. David Deutsch comes across as a true visionary even if his ideas concerning multiple universes sound far-fetched. Rather like Penrose's, "The Emperor's New Mind", Brown caters for multiple tastes by writing for a general audience but adding (mostly in appendices) some mathematical explanations and circuit diagrams. These can be can be safely skipped without losing the narrative thread. A pity to do so though because his explanations are a delight. Thoroughly recommended.
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I read "Minds, Machines, and the Multiverse" (reprinted in paperback as "The Quest for the Quantum Computer") alongside David Deutsch's "The Fabric of Reality," thinking that Julian Brown's journalism would help elucidate Deutsch's text, which I assumed would be more difficult. Ironically, not only did I find "The Fabric of Reality" far more exciting and readable, but, even on its own terms, Brown's book was often monotonous and unimaginative. While the first and last chapters are quite fascinating, the meat of the book reads like an endless serious of abstracts of articles excerpted from mathematical, physics, and computing journals, separated by droll subheads ("Beam Me Up, Atom by Atom"). The major problem is that Brown doesn't seem to have any particular audience in mind. On the one hand, it's hard to imagine most lay readers sitting through his detailed expositions on various mathematics and physics concepts; on the other, math-savvy readers don't need to be told (to cite just one example) what ASCII is. It's not just that Brown's book is knee-deep in mathematics, however. In fact, the math presented is really not that difficult--it's just boringly presented. The endless series of Alice, Bob, Carol, and Eve stories has all the verve of the litany of questions on the SAT. (Several times I found myself asking, "Which Bob is this?"). Likewise, the descriptions of logic gates are about as exciting as my college textbooks on linear algebra and number theory. Brown's presentation is hampered further by the lack of a glossary; he repeatedly expects the reader to remember terms he discussed over 100 pages earlier. In sum, computer programmers and armchair mathematicians looking for a primer on the theoretical underpinnings of quantum computation might find this book a helpful introduction. The general reader, however, will have to wait for a well-written overview of the subject. In the meantime, I recommend "The Fabric of Reality" as a starting point.
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This is a decent sequel to David Deutsch's Fabric of Reality. Unlike much of the contemporary scene, this book doesn't dumb itself down for the lowest common denominator. The nice thing about this book though, is that while it gets down into the nitty gritty you can still follow along at whatever level you are at. Some people might give a ho-hum about quantum computers but once these people get past their own inertia they will be compelled to accept just how profoundly quantum computers will change our current collective conceptual framework. Also, at a little over half way through this book you might begin to wonder where the Mind part fits in with the Machine and Multiverse parts but by the final lines everything slips snuggly into place. Perhaps the only disappointment, which is surely not the book's fault, is that quantum computers are still only ideas not actualities. However exciting this topic may be, it is a topic about the near future, not the present, and so we are naturally left wanting more.
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But didn't. It tries really hard and has a noble goal, but I think falls quite short. This is a topic that I am quite passionate about and was one of the first books on the topic. At the end of reading this book you will have very many more questions and unfortunately very few clear ideas about the workings or theory of quantum computers. Over and again Brown stops just before giving you the details that you hope for. I've actually found David Deutsch's papers on quantum computing (at qubit.org) almost as accessibe and much more informative than this book, not to mention that they are much more concise. If you're hoping to get a basic grasp of quantum computing, read John Gribben's "In Search of Schrödinger's Cat" for a non-technical crash course in quantum mechanics and then head for the scientific papers. This book fails to gauge what a reader will be able to understand. This is a difficult task at times, but when writing "popular science" the author must choose a level to present the material at. Unfortunately in parts that aren't particularly interesting the author pushes this only to retreat at a point where things are getting interesting. You're left feeling, "No, really. I can take it!"
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This is the book I recommend to all my technical friends who are wondering what quantum computing is about. Brown writes with astonishing lucidity and an intense focus on what he's trying to communicate. If this book has a flaw, it's that I think it gives Deutsch and the many-universes interpretation of QM a bit too much airtime. Deutsch's views are well-presented in many other places and it dilutes this book somewhat to spend so much time on him when it really isn't necessary. I don't understand the review that said this book wasn't technical enough. Yes, it's not a textbook for learning how to write quantum algorithms. But it does have detailed quantum circuit diagrams for a number of useful or interesting ones. When I read this book I finally saw enough of the details to "get it". I launched from this directly into the scientific literature without getting too terribly lost. I would recommend this book over Milburn's "The Feynman Processor". Milburn knows his material but he tends to wander a lot. His book is OK and useful, but this one is better. I'd put it in the same class as Gleick's "Chaos".
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