Scott Aaronson, professor of computer science at the University of Texas at Austin, severely panned Kaku's book on his blog, Shtetl-Optimized.

After pointing out several substantial factual errors, Aaronson concluded that "the bulk of the book is actually about stuff with no direct relation to quantum computing at all—the origin of life, climate change, energy generation, cancer, curing aging, etc.—except with ungrounded speculations tacked onto the end of each chapter about how quantum computers will someday revolutionize all of this.

Kirkus Reviews wrote, "As always, Kaku’s enthusiasm is contagious, and this latest book is an important guide to a crucial part of the tech future.

"[4] A reviewer of Publishers Weekly commented, "Despite Kaku’s best efforts, readers will likely be left scratching their heads at the descriptions of how different models of quantum computing work, with one that involves 'ion traps' in which atoms spin upward or downward and another that takes advantage of the polarization of light...

"[5] Alan Boyle of GeekWire added, "One is a mind-blowing work of fiction, while the other is an emerging frontier in computer science — but both of them deal with rearrangements of particles in superposition that don’t match our usual view of reality.