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# Topic: Timeline of quantum computing

###### In the News (Mon 19 Aug 19)

 Quantum computer - Wikipedia, the free encyclopedia In a classical (or conventional) computer, the amount of data is measured by bits; in a quantum computer, it is measured by qubits. Quantum computers are different from classical computers such as DNA computers and computers based on transistors, even though these may ultimately use some kind of quantum mechanical effect (for example covalent bonds). Qubits for a quantum computer can be implemented using particles with two spin states: "up" and "down"; in fact any system, possessing an observable quantity A which is conserved under time evolution and such that A has at least two discrete and sufficiently spaced consecutive eigenvalues, is a suitable candidate for implementing a qubit. en.wikipedia.org /wiki/Quantum_computer   (3247 words)

 Quantum computer : Quantum computing   (Site not responding. Last check: 2007-07-09) A quantum computer is a device that computes using superpositions of quantum states. Quantum computers are different from classical computers such as some quantum dot computers[?], DNA computers[?], and computers based on transistors, even though all of these use quantum mechanical effects other than state superpositions. The existence of quantum computers doesn't disprove the Church-Turing thesis. www.explainthat.info /qu/quantum-computing.html   (2508 words)

 The Qubit and Quantum Computing: The Next Wave Quantum computing has its roots in classical computers, which were developed in the middle of the 20th century and have evolved considerably since. While classical computers of the mid 20th century utilized as their basic unit of information the "bit", which could represent at any one time either "0" or "1", a quantum bit, or "qubit", would harness the power of quantum mechanics in order to represent "0", "1", or a superposition of both. The first quantum computer consisted of two qubits and was demonstrated by a team of researchers led by Isaac Chuang at the University of California-Berkeley in 1998. www.people.virginia.edu /~xy9z/qubit/qubit.php   (5639 words)

 Silicon chips set to go atomic TRN 072402 Prototype quantum computers, which use atoms or subatomic particles to carry out computations, are laboratory oddities that run gamut from lasers fired into special crystals to test tubes of liquid placed in the same type of machine that produces medical MRIs. Quantum computers could be fantastically fast at solving large problems like cracking secret codes, but they remain largely theoretical, which is why researchers are trying different approaches to see if it's possible to make large, practical computers that use the states of subatomic particles to store and process information. Researchers generally agree that liquid NMR quantum computers, however, cannot be made larger than 10 qubits because the strength of the radio signals from the qubits decreases exponentially compared to the noise with each additional qubit. www.trnmag.com /Stories/2002/072402/Silicon_chips_set_to_go_atomic_072402.html   (1234 words)

 Teleport lifts quantum computing TRN 071404 A leading candidate architecture for quantum computing -- trapped ions -- has received a significant boost with a pair of teleportation experiments that show is possible to reliably and readily shuttle information within a quantum computer. The method allows quantum bits, or qubits, to be stored before and after teleportation so that quantum computers can process information, move it to a different part of the computer and then process it further. Practical applications for full quantum computers that have several hundred thousand qubits are one or two decades away, but specialized applications that require only a few qubits are two to five years away, and applications that require 10 to 20 qubits are five to ten years away, said Blatt. www.trnmag.com /Stories/2004/071404/Teleport_lifts_quantum_computing_071404.html   (1087 words)

 quantumcomputers Because Quantum computing is a very controversial type of computing of which some say that it will never be realized in a practical way. A quantum computer is not simply to describe because the scientist are only developing theories and practical implementation since recent years. Penrose proposes that the brain is a quantum computer. www.thocp.net /hardware/quantumcomputers.htm   (1448 words)

 Quantum_computer   (Site not responding. Last check: 2007-07-09) For a generally accessible overview of quantum computing, see Quantum Computing with Molecules (http://www.media.mit.edu/physics/publications/papers/98.06.sciam/0698gershenfeld.html), an article in Scientific American by Neil Gershenfeld and Isaac L. Chuang. QCF (http://www.charlesfox.org.uk) — Quantum computation toolbox for MATLAB. Fraunhofer Quantum Computing Simulator (http://www.qc.fraunhofer.de) — A free web-based quantum simulator (31 qubits) and a collaborative workspace for the quantum computing community. www.usedaudiparts.com /search.php?title=Quantum_computer   (3086 words)

 [No title]   (Site not responding. Last check: 2007-07-09) Many government and military bodies such as NATO fund universities and quantum computing research centres, to develop a computer for cryptography and surveillance, i.e. Quantum computers are different from classical computers such as DNA computers and computers based on transistors, even though these use quantum mechanical effects other than state superpositions. The existence of quantum computers does not disprove the Church-Turing thesis. www.askmytutor.co.uk /q/qu/quantum_computer.html   (2303 words)

 Qubit   (Site not responding. Last check: 2007-07-09) That information is described by state in a 2-level quantum mechanical system, whose two basic states are conventionally labeled $0 \rangleand1 \rangle\left(pronounced: ket 0 and ket 1\right).$ Such "quantum parallelism" is one of the keys to the potential power of quantum computation. Similarly, a unit of quantum information in a 3-level quantum system is called a qutrit, by analogy with the unit of classical information trit. www.usedaudiparts.com /search.php?title=Qubit   (343 words)

 List of themed timelines   (Site not responding. Last check: 2007-07-09) Timeline is a 1999 science fiction novel by Michael Crichton Timeline is a 2003 film based on the novel. General: List of years in science, Timeline of scientific discoveries, Timeline of scientific experiments, Timeline of environmental history of New Zealand www.casimiro.com /wiki/en/wikipedia/l/li/list_of_themed_timelines.html   (252 words)

 Timeline of computing This article presents a detailed timeline of events in the history of computing. For a narrative explaining the overall developments, see the related History of computing. An excellent Computer history site; the above is a modified version of his timeline, used with permission. www.sciencedaily.com /encyclopedia/timeline_of_computing   (173 words)

 List of themed timelines : Timeline   (Site not responding. Last check: 2007-07-09) List of timelines from across the web of things that never were (http://www.mts.net/~arphaxad/history.html) All is still licensed under the GNU FDL. Bundy's times, had even seen her pass in and out, and this observation had prejudice, it was true, had been subjected to a violent test; it. www.termsdefined.net /ti/timeline.html   (225 words)

 Site Contents at the free Online Encyclopedia.   (Site not responding. Last check: 2007-07-09) Timeline of the 2001 anthrax attacks in Florida Timeline of the 2001 anthrax attacks in New York In a household, clothes hangers are the single one item that you own the most of, yet no one can name even one brand? www.onlineencyclopedia.org /index_322.html   (170 words)

 Learn more about Timeline of quantum computing in the online encyclopedia.   (Site not responding. Last check: 2007-07-09) Learn more about Timeline of quantum computing in the online encyclopedia. You are here: Online Encyclopedia > Timeline of quantum computing Hint: Play with putting spaces before and after your words to see the different results you get. www.onlineencyclopedia.org /t/ti/timeline_of_quantum_computing.html   (704 words)

 Quantum computer   (Site not responding. Last check: 2007-07-09) Ekert, A. Quantum Cryptography Based on Bell's Theorem. Shor, P. Scheme for reducing decoherence in quantum computer memory. Calderbank, A. and Shor, P.W. Good quantum error-correcting codes exist. www.punweb.com /article/Quantum_computing   (3206 words)

 ...useless miscellany: Timeline   (Site not responding. Last check: 2007-07-09) I just finished this one up in about 3 days after my wife insisted that I read it. Didn’t quite have them nailed down firm, but you can also imagine this fairly twisted and intertwined group of 'family' battling it out for control in a Camelot like alternative world. Of course, Crichton’s Timeline is speaking more to our 'entertainment' society and not so much the epic that I just painted, but it’s still entertaining. www.emaynard.org /uselessmisc/archives/001282.html   (242 words)

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