Quest for the Quantum ComputerSimon and Schuster, 14.08.2001 - 400 Seiten Taking readers to the cutting edge of physics, mathematics, and computer science, Julian Brown tells the dramatic story of the groundbreaking efforts to create a fundamentally new kind of computer that would be astronomically more powerful than today's machines. In 1998, a team of researchers announced they had produced the world's first quantum computer in a cup of chloroform. In fascinating, fully accessible detail, Brown explains the ideas that led up to this accomplishment and explores the mind-stretching implications of this leap into the bizarre world of quantum physics. The Quest for the Quantum Computer is a riveting look at what promises to be one of the most important scientific and technological ideas of the twenty-first century. |
Andere Ausgaben - Alle anzeigen
Minds, Machines, and the Multiverse: THE QUEST FOR THE QUANTUM COMPUTER Julian Brown Eingeschränkte Leseprobe - 2002 |
Häufige Begriffe und Wortgruppen
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 Hadamard transformation idea input ion trap known Landauer laser laws of physics light logic gate look machine many-universes mathematical measurement 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
Beliebte Passagen
Seite 97 - If, without in any way disturbing a system, we can predict with certainty (ie with probability equal to unity) the value of a physical quantity, then there exists an element of physical reality corresponding to this physical quantity".
Seite 17 - In all fictional works, each time a man is confronted with several alternatives, he chooses one and eliminates the others; in the fiction of Ts'ui Pen, he chooses — simultaneously — all of them. He creates, in this way, diverse futures, diverse times which themselves also proliferate and fork.
Seite 28 - ... one grain on the first square, two on the second, four on the third, eight on the fourth, and so on ... anyway, it wound up with an amount equal to a couple of years' world supply, and with the empire and all its resources in the hands of our hero.
Seite 103 - At any rate, it seems that the laws of physics present no barrier to reducing the size of computers until bits are the size of atoms, and quantum behavior holds dominant sway.
Seite 105 - I was accompanying Einstein on a walk from The Institute for Advanced Study to his home, when he suddenly stopped, turned to me, and asked me if I really believed that the moon exists only if I look at it.
Seite 25 - There are only about 1080 atoms in the entire visible universe, an utterly minuscule number compared with 10500. So if the visible universe were the extent of physical reality, physical reality would not even remotely contain the resources required to factorize such a large number. Who did factorize it, then? How, and where, was the computation performed?
Seite 104 - No elementary quantum phenomenon is a phenomenon until it's brought to a close by an irreversible act of amplification by a detection such as the click of a geiger counter or the blackening of a grain of photographic emulsion.
Seite 98 - I've entertained myself always by squeezing the difficulty of quantum mechanics into a smaller and smaller place, so as to get more and more worried about this particular item. It seems to be almost ridiculous that you can squeeze it to a numerical question that one thing is bigger than another. But there you are — it is bigger than any logical argument can produce, if you have this kind of logic.
Seite 99 - I'm not happy with all the analyses that go with just the classical theory, because Nature isn't classical, dammit, and if you want to make a simulation of Nature, you'd better make it quantum mechanical, and by golly it's a wonderful problem, because it doesn't look so easy.
Seite 162 - ... individual users are very different in this regard, so different that, in fact, there is little overlap between systems that address these two problems. The ultimate goal of government-driven key recovery encryption, as stated in the US Department of Commerce's recent encryption regulations, "envisions a worldwide key management infrastructure with the use of key escrow and key recovery encryption items." 12 The requirements put forward to meet law enforcement demands for such global key recovery...