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Topic: Centre for Quantum Computation

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	The Structure of the Multiverse
		The quantum theory of computation is useful in this investigation because, as we shall see, the structure of the multiverse is determined by information flow, and the universality of computation ensures that by studying quantum computational networks it is possible to obtain results about information flow that must also hold for quantum systems in general.
		That is not to say that the quantum network is a classical computer during such a period: it still has qubits rather than bits; it (or at least, the network as a whole) is still undergoing coherent motion; and its computational state is not specified by any sequence of N binary digits.
		Quantum computations When a quantum computational network is performing a general computation, it need not be the case that the descriptors of any part of the network over two or more computational steps constitute a representation of an evolving e-algebra.
	www.angelfire.com /empire/istpep/deutsch (3623 words)

	What is quantum computing? - A Word Definition From the Webopedia Computer Dictionary (Site not responding. Last check: 2007-11-07)
		First proposed in the 1970s, quantum computing relies on quantum physics by taking advantage of certain quantum physics properties of atoms or nuclei that allow them to work together as quantum bits, or qubits, to be the computer's processor and memory.
		By doing a computation on many different numbers at once, then interfering the results to get a single answer, a quantum computer has the potential to be much more powerful than a classical computer of the same size.
		Quantum computing is not well suited for tasks such as word processing and email, but it is ideal for tasks such as cryptography and modeling and indexing very large databases.
	www.webopedia.com /TERM/Q/quantum_computing.html (414 words)

	Quantum computer - Wikipedia, the free encyclopedia
		In a classical (or conventional) computer, the amount of data is measured by bits; in a quantum computer, the data is measured by qubits.
		Quantum computers are different from other 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).
		Centre for Quantum Computation, University of Cambridge http://cam.qubit.org
	en.wikipedia.org /wiki/Quantum_computation (3464 words)

	Quantum Cryptography - Interview with Dr. David Deutsch
		And I did that: I proposed the universal quantum computer and proved it was universal.
		It's a two-qubit gate, where a qubit is the quantum equivalent of a bit, and it does nothing if the first input is a zero, and it flips the second input if the first input is a one.
		Quantum computation is one of the greatest challenges facing experimental physics.
	www.esi-topics.com /enc/interviews/Dr-David-Deutsch.html (1358 words)

	Denis Simakov. Quantum Computation (Spring 2002) (Site not responding. Last check: 2007-11-07)
		Contemporary computers are classical, which means that their operation relies on principles of classical physics and the underlying mathematical model is based on the Turing Machine.
		In the last ten years, a mathematical model of quantum computation has been extensively investigated, and some dramatic results have been obtained, e.g., the well known polynomial time quantum algorithm for factoring numbers [Shor 1994].
		Moreover, the theory of quantum computation may also provide a better understanding of some of the long standing paradoxes in quantum mechanics.
	www.wisdom.weizmann.ac.il /~deniss/courses/spr02_quantum.html (258 words)

	Interests
		Quantum Optics and Foundations of Physics, they are doing research in photonic entanglement and molecular optics to test the most fundamental issues in quantum physics.
		Quantum Information Processing Job Listings, this site is devoted to listing postdoctoral and faculty job openings in quantum information theory and quantum computation, as a service to the QIP community.
		Quantum entanglement, by which we mean the existence of nonlocal quantum correlations between space-like separated systems, is one of the most fertile and thought-generating properties of quantum mechanics.
	web.it.kth.se /~hoshang/interest.htm (974 words)

	nanogloss.com - quantum computing (Site not responding. Last check: 2007-11-07)
		Quantum theory principles explain the rules followed by energy and matter at the atomic level.
		Quantum Computing could lead to completely new forms of computing, characterized by speed and power, at a range which is unthinkable today.
		This oddity of quantum physics is still unexplained, but the ability of a particle to interact - instantaneously - with its entangled pal could also lead to an awesome computational power.
	www.nanogloss.com /defi/quacomp.htm (236 words)

	THE EDGE OF COMPUTATION SCIENCE PRIZE
		DAVID DEUTSCH is the founder of the field of quantum computation.
		Presently, small quantum computers are operating in laboratories around the world, and the race is on to find a scalable implementation that, if successful, will revolutionize the technologies of computation and communications.
		Among his key contributions in the last ten years are a paper with Ekert and Jozsa on quantum logic gates, and a proof of universality in quantum computation, with Barenco and Ekert (both in 1995).
	www.edge.org /3rd_culture/prize05/prize05_index.html (2398 words)

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		The discovery that quantum physics allows fundamentally new modes of information processing has required the existing theories of computation, information and cryptography to be superseded by their quantum generalisations.
		The Centre for Quantum Computation, part of the University of Oxford, conducts theoretical and experimental research into all aspects of quantum information processing, and into the implications of the quantum theory of computation for physics itself.
		Quantum interference can be explained by saying that the particle is in a superposition of the two experimental paths: passage through the upper slitñ and passage through the lower slitñ.
	www.lycos.com /info/quantum--quantum-information-processing.html (443 words)

	Edge: DAVID DEUTSCH
		His papers on quantum computation laid the foundations for that field, breaking new ground in the theory of computation as well as physics, and have triggered an explosion of research efforts worldwide.
		His 1995 paper, "Conditional quantum dynamics and logic gates" (with A. Barenco, A. Ekert and R. Jozsa) was an important step in clarifying what sort of physical processes would be needed to implement quantum computation in the laboratory, and what sort of things the experimentalists should be trying to get to work.
		"Universality in quantum computation", also written in 1995 (with A. Barenco and A. Ekert) proved the universality of almost all 2-qubit quantum gates, thus verifying his conjecture made in 1989 and showing that quantum computation and quantum gate operations are 'built in' to quantum physics far more deeply than classical physics.
	www.edge.org /3rd_culture/bios/deutsch.html (613 words)

	Quantum cloning nears perfection limit - 29 March 2002 - New Scientist (Site not responding. Last check: 2007-11-07)
		Particles such as photons and electrons have quantum properties that, according to the theory of relativity, can never be copied exactly unless you destroy the original in the process.
		That is the basis of quantum cryptography - an eavesdropper cannot copy your message without disrupting it and alerting you to their presence.
		The theoretical accuracy limit of copying quantum information - such as the direction of polarisation of a single photon - is of five-sixths, or 83 per cent.
	www.newscientist.com /article.ns?id=dn2111 (549 words)

	Quantum Philosophy Theories
		He is especially interested in the quantum mechanical and associated computational modelling of collisions of nucleons, loosely bound composite and unstable (neutron or proton rich) nuclear systems, their scattering and breakup.
		The microtubule quantum computations are suggested to be orchestrated by synaptic events, and reduce by Penrose’s proposed quantum gravity-linked objective reduction (“OR”), hence the model is called orchestrated objective reduction (“Orch OR”).
		Her research is devoted to the foundations of quantum mechanics, the theory of probabilities, and the theory of information.
	www.qpt.org.uk /netlink.php (4077 words)

	Quantum Computation and Information Theory Course
		This course is given by the Physics Department, with assistance from the Computer Science Department, and the Department of Physics and Astronomy of the University of Pittsburgh.
		Quantum theory is not a prerequisite, and appropriate quantum concepts will be introduced as needed.
		Centre for Quantum Computation, University of Oxford Tutorials and introductory articles covering various aspects of quantum information.
	quantum.phys.cmu.edu /QCQI (763 words)

	Dr J.A. Jones (Site not responding. Last check: 2007-11-07)
		Quantum computers have the potential to revolutionise many branches of science through their ability to tackle problems too large for any classical computer.
		Quantum computers are built out of two basic components: quantum bits (qubits) and quantum logic gates.
		Quantum logic gates are implemented by combining the effects of pulsed radio frequency fields with the naturally occurring spin-spin interaction, which allows each nucleus to sense the behaviour of other nuclei in the same molecule.
	www.chem.ox.ac.uk /researchguide/jajones.html (640 words)

	Quantum Entanglement and Information (Stanford Encyclopedia of Philosophy)
		The puzzle is that the quantum state of the particle pair is inconsistent with the assignment of labels to the particles separately that could be associated with appropriately correlated values for the outcomes of position and momentum measurements.
		The impossibility of copying an unknown quantum state, or a state that is known to belong to a set of nonorthogonal states with a certain probability, and the existence of a trade-off relation between information gain and state disturbance, is the basis of the application of quantum information to cryptography.
		The idea, roughly, is that an entangled state of the sort that arises in the quantum computation of a function, which represents a linear superposition over all possible arguments and corresponding values of the function, should be understood as a manifestation of parallel computations in different worlds.
	plato.stanford.edu /entries/qt-entangle (5625 words)

	Learning Material on Quantum Computing (Site not responding. Last check: 2007-11-07)
		A brief overview of the evolution of computing toward the "nanometre" scale where quantum mechanics may be exploited.
		A short introduction to quantum computation by A. Barenco, A.Ekert, A. Sanpera and C.Machiavello from La Recherche, November 1996.
		Quantum cryptography could well be the first application of quantum mechanics at the individual quanta level.
	qubit.damtp.cam.ac.uk /articles (353 words)

	Centre for Quantum Computation - Wikipedia, the free encyclopedia
		The Centre for Quantum Computation or CQC, part of the Universities of Oxford and Cambridge, conducts theoretical and experimental research into all aspects of quantum information processing, and into the implications of the quantum theory of computation for physics itself.
		The centre was originally founded in Oxford, and split into two on the migration of Artur Ekert.
		The Cambridge CQC is based at the Department of Applied Mathematics and Theoretical Physics (DAMTP).
	en.wikipedia.org /wiki/Centre_for_Quantum_Computation (148 words)

	Experimental Quantum Cloning of Single Photons -- Lamas-Linares et al., 10.1126/science.1068972 -- Science
		Centre for Quantum Computation, University of Oxford,Parks Road, Oxford OX1 3PU, UK; Department of Physics, University of California at Santa Barbara.
		Although perfect copying of unknown quantum systems is forbidden by the laws of quantum mechanics, approximate cloning is possible.
		In this context the fundamental quantum limit to the quality of the clones is imposed by the unavoidable presence of spontaneous emission.
	www.sciencemag.org /cgi/content/abstract/1068972v1 (324 words)

	Open Questions: Quantum Information and Computing
		Certain kinds of systems known as "fractional quantum Hall fluids" may be able to solve equations in the mathematical theory of braids, which could make possible the computation of the knot invariants known as "Jones polynomials", and consequently be able to solve manhy other hard problems as well.
		The quantum effects of nuclear magnetic resonance may enable constructions of computers based on molecules of ordinary liquids.
		Basic ideas of quantum information and entanglement are presented, as well as more advanced topics like quantum error correction and fault-tolerant quantum computing.
	www.openquestions.com /oq-te008.htm (2426 words)

	Thursday April 5, 2006 Astronomy and Telescopes presents: ODP Search 1078690851 (Site not responding. Last check: 2007-11-07)
		Quantum Architecture Research Center - The home page of a team formed by Frederic Chong, Isaac Chuang, and John Kubiatowicz, the three top experimentalists in quantum computing.
		Quantum Computer Simulators - A concise summary of the many quantum computer simulators that are available through the internet.
		Quantum Computing with Electron Spins in Quantum Dots - A detailled study of using electron spins for quantum computation.
	kyes-world.com /index634.html (802 words)

	Physics 219 Course Information
		Quantum Computation and Quantum Information by Michael Nielsen and Isaac Chuang, will be available in the fall of 2000.
		A quantum computer will be much more vulnerable than a conventional digital computer to the effects of noise and of imperfections in the machine.
		Quantum error-correcting codes, entanglement measures, quantum channel capacity.
	www.theory.caltech.edu /people/preskill/ph229 (1052 words)

	QICSS - Quantum Information and Computation Summer School
		Quantum information and quantum computation is one of the most exciting and dynamic research areas of modern science.
		The aim of this summer school is to introduce students and researchers in computer science, mathematics and physics to the basic notions of quantum information and quantum computation.
		Prior knowledge of computer science and quantum mechanics will not be assumed, however participants should have mathematical maturity at least the equal of a fourth year undergraduate in any of these disciplines.
	www.physics.uq.edu.au /qicss/index.html (369 words)

	Quantum Information Science
		Quantum information science (QIS) is a new field of science and technology, combining and drawing on the disciplines of physical science, mathematics, computer science, and engineering.
		Until recently, such quantum effects have mostly been seen as a nuisance, causing small devices to be less reliable and more error-prone than their larger cousins.
		A quantum computer, if one can be built, could perform some computations that would take longer than the age of the universe on today's supercomputers.
	www.wtec.org /qis (544 words)

	Wired News: Quantum Mechanics' New Horizons
		Quantum computing will dominate the discussion in roughly half of the talks presented -- from such distinguished researchers as David Deutsch of Oxford University's Centre for Quantum Computation, Brian Josephson of Cambridge University and Phil Platzman of Lucent Bell Labs.
		Such progress indeed raises the possibility of showcasing a quantum computer's unrivaled speed and power within the decade.
		First, he said, quantum technologies are already being developed for ultra-sensitive gravity meters used in the mapping of planetary features.
	www.wired.com /news/technology/0,1282,44891,00.html (668 words)

	ZapMeta Directory > Computers > Computer Science > Theoretical > Quantum Computing (Site not responding. Last check: 2007-11-07)
		D-Wave Systems (dwavesys.com) is a portal to the state of the art in the design of quantum computers, operating systems, algorithms, hardware, superconductors, and quantum physics.
		An tutorial on quantum algorithms for those new to the field and who do not have an extensive physics background.
		A C library for the simulation of a quantum computer.
	zapmeta.com /search/meta/db.pl?dir=6378 (450 words)

	HP Labs : QIP : People
		Tim's main QIPC research interest is quantum hardware theory, examples being superconducting circuits, magnetic and other solid state systems and non-linear devices such as Josephson and EIT systems, and the transformation of quantum information science into actual technologies.
		Her research interests have been focused around quantum computation and information processing, quantum and atom optics, Lie groups and algebra, quantum nonlinear dynamics, the foundation of quantum mechanics and quantum stochastic processes.
		During his post graduate studies he contributed to a practical proposal for solid state quantum computation using sodium impurities in silicon, which is presently being pursued by researchers in the Semiconductor Physics Group at Cambridge.
	www.hpl.hp.com /research/qip/people.html (899 words)

	Introduction to Quantum Computation (M16) (Site not responding. Last check: 2007-11-07)
		This course is an introduction to current developments in quantum computation and quantum information theory.
		Topics include: quantum logic gates, quantum networks, quantum entanglement, decoherence, selected quantum algorithms, elements of computational complexity, quantum error correction, fault tolerant quantum computation, and physical implementations of quantum computation.
		Familiarity with basic concepts of information theory and computational complexity is useful, however, the relevant material is introduced so you don't need to worry if you haven't seen it before.
	www.maths.cam.ac.uk /CASM/tex/courses/descriptions/node80.html (136 words)

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