## Minds, Machines, and the Multiverse: The Quest for the Quantum ComputerThe traditional and ubiquitous digital computer has changed the world by processing series of binary ones and zeroes...very fast. Like the sideshow juggler spinning plates on billiard cues, the classical computer moves fast enough to keep the plates from falling off. As computers become faster and faster, more and more plates are being added to more and more cues. Imagine, then, a computer in which speed is increased not because it runs faster, but because it has a limitless army of different jugglers, one for each billiard cue. Imagine the quantum computer. Julian Brown's record of the quest for the Holy Grail of computing -- a computer that could, in theory, take seconds to perform calculations that would take today's fastest supercomputers longer than the age of the universe -- is an extraordinary tale, populated by a remarkable cast of characters, including David Deutsch of Oxford University, who first announced the possibility of computation in the Alice-in-Wonderland world of quantum mechanics; Ed Fredkin, who developed a new kind of logic gate as a true step toward universal computation; and the legendary Richard Feynman, who reasoned from the inability to model quantum mechanics on a classical computer the logical inevitability of quantum computing. For, in the fuzzily indeterminate world of the quantum, new computing power is born. Minds, Machines, and the Multiverse details the remarkable uses for quantum computing in code breaking, for quantum computers will be able to crack many of the leading methods of protecting secret information, while offering new unbreakable codes. Quantum computers will also be able to model nuclear and subatomic reactions; offer insights into nanotechnology, teleportation, and time travel; and perhaps change the way chemists and biotechnologists design drugs and study the molecules of life. Farthest along the trail blazed by these pioneers is the ability to visualize the multiple realities of the quantum world not as a mathematical abstraction, but as a real map to a world of multiple universes...a multiverse where every possible event -- from a particular chess move to a comet striking the Earth -- not only can happen, but does. Incorporating lively explanations of ion trap gates, nuclear magnetic resonance computers, quantum dots, quantum algorithms, Fourier transforms, and puzzles of quantum physics, and illustrated with dozens of vivid diagrams, Minds, Machines, and the Multiverse is a mind-stretching look at the still-unbuilt but fascinating machines that, in the words of physicist Stanley Williams, "will reshape the face of science" and offer a new window into the secrets of an infinite number of potential universes. |

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#### Review: MINDS, MACHINES, AND THE MULTIVERSE: THE QUEST FOR THE QUANTUM COMPUTER

User Review - David Kemp - GoodreadsGreat introduction to the relatively new field of "quantum computing" and the quantum weirdness that it relies on. Brown is excellent at explaining the key concepts. From what I have been reading ... Read full review

#### Review: Minds, Machines and Multiverse: The Quest for the Quantum Computer

User Review - Joonas - GoodreadsI read just half. it was too heavy for now. Read full review

### Contents

Contents | 13 |

God the Universe and the Reversible Computer | 40 |

The Logic of the Quantum Conspiracy | 83 |

Copyright | |

11 other sections not shown

### Other editions - View all

Minds, Machines, and the Multiverse: THE QUEST FOR THE QUANTUM COMPUTER Julian Brown Limited preview - 2002 |

### Common terms and phrases

able Alice and Bob answer Artur Ekert atoms beam Bennett billiard ball bit commitment Brassard calculation chip circuit classical computer controlled-NOT gate David Deutsch decoherence device Ekert electron encoded encryption energy entangled particles error correction example experiment exponential factor Feynman Figure flip Fourier transform Fredkin gate frequency function Hadamard transformation idea input ion trap known Landauer laser laws of physics light logic gate look machine many-universes mathematical measurement ments molecules nonlocality operation output paper Penrose perform phase photons physicists polarized possible problem produce public key pulse quan quantum computer quantum cryptography quantum dots quantum gates quantum information quantum logic quantum mechanics quantum systems quantum theory qubit random reason researchers result reversible computer rotation scheme scientists sequence Shor Shor's signals simple simulate spins superposition switch teleportation tion Toffoli gate Turing universe wave