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Topic: Quantum information processing

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	Timeline of quantum computing - Wikipedia, the free encyclopedia
		1976 - Polish mathematical physicist Roman Ingarden, in one of the first attempts at creating a quantum information theory, shows that Shannon information theory cannot directly be generalized to the quantum case, but rather that it is possible to construct a quantum information theory which is a generalization of Shannon's theory.
		This is an approach to making quantum computers that can compute with large numbers of qubits for long periods of time.
		Slowing the light down alows information to be mapped on the light pulse, like memory in a conventional computer.
	en.wikipedia.org /wiki/Timeline_of_quantum_computing (899 words)

	QIP 2002 (Site not responding. Last check: 2007-10-21)
		Quantum information processing is the intersection of quantum mechanics and computer science.
		After Peter Shor's 1994 discovery of efficient quantum algorithms for factoring and the discrete log (threatening current "classical" cryptography), the field has grown explosively and is now one of the hottest subfields of both computer science and physics.
		QIP 2002 is the fifth workshop on quantum computing, quantum cryptography, and quantum information theory in the tradition of AQIP 98 in Århus, AQIP 99 in Chicago, QIP 2000 in Montréal, and QIP 2001 at the CWI in Amsterdam.
	www.research.ibm.com /quantuminfo/qip2002 (210 words)

	Quantum Information and NMR conference (Site not responding. Last check: 2007-10-21)
		Quantum theory and relativity resulted in momentous advances--such as nuclear fission and fusion--which have dramatically altered the way we communicate, conduct business, earn our living, and resolve conflicts.
		Present day classical computers advance at a rapid pace toward the quantum barrier defined by the laws of quantum physics, which are in turn reflected in the present day hardware.
		Quantum computation is an attempt to short-circuit that asymptotic process, and to exploit quantum laws laws to advantage instead of regarding them as constraints.
	qso.lanl.gov /qc/nmrconf (222 words)

	Fundamentals of quantum information (March 1998) - Physics World - PhysicsWeb (Site not responding. Last check: 2007-10-21)
		A well known example of quantum superposition is the double-slit experiment in which a beam of particles passes through a double slit and forms a wave-like interference pattern on a screen on the far side.
		A necessary condition for quantum interference is that the experiment must be performed in such a way that there is no way of knowing, not even in principle, which of the two slits the particle passed through on its way to the screen.
		But now the information is encoded in such a way that neither of the two qubits carries any well defined information on its own: all of the information is encoded in their joint properties.
	physicsweb.org /article/world/11/3/9 (3345 words)

	QIP 2005 - the 8th workshop on Quantum Information Processing (Site not responding. Last check: 2007-10-21)
		To be held at MIT in Cambridge, Massachusetts (USA); hosted by the quantum information science groups in the Center for Bits and Atoms and the Department of Physics.
		Quantum information processing is the recasting of computer science in a quantum mechanical framework.
		QIP 2005 is the eighth workshop on theoretical aspects of quantum computing, quantum cryptography, and quantum information theory in a series which started in Aarhus in 1998 and was held last year at the Perimeter Institute in Waterloo.
	stuff.mit.edu /afs/athena/org/q/qip2005 (243 words)

	Condensed Matter Theory - Daniel Loss
		Quantum computing and quantum communication are remarkable examples of new information processing technologies that arise from the coherent manipulation of spins in nanostructures.
		After giving a bibliography providing a general introduction to the subject of quantum information processing, we review the various approaches that are being considered for the experimental implementation of quantum computing and quantum communication in atomic physics, quantum optics, nuclear magnetic resonance, superconductivity, and, especially, normal-electron solid state physics.
		Finally, we consider the transport of quantum information via the motion of individual electrons in mesoscopic structures; specific transport and noise measurements in coupled quantum dot geometries for detecting and characterizing electron-state entanglement are analyzed.
	theorie5.physik.unibas.ch /loss (14510 words)

	CRM: Quantum Information Processing (Site not responding. Last check: 2007-10-21)
		Quantum information processing is a new and exciting field that studies the implication of quantum mechanics for information processing purposes.
		QIP 2000, which takes place just slightly before year 2000, is part of the 1999-2000 special year on Mathematical Physics, sponsored by the CRM.
		It is also the natural continuation of the workshops on Algorithms in Quantum Information Processing (AQIP '98 in Aarhus and AQIP '99 in Chicago).
	www.crm.umontreal.ca /act/theme/1999/at_1999_12_05_an.html (269 words)

	European Research Network: The Physics of Quantum Information (Site not responding. Last check: 2007-10-21)
		Quantum physics is so radically different from classical physics that a slight modification of the present knowledge of transmitting and processing information is not justified.
		Quantum cryptography makes explicit use of the complementarity principle and the indivisibility of quanta to ensure that unnoticed eavesdropping on the quantum information channel is impossible by the laws of physics.
		Quantum communication schemes employ the qualitative difference between classical and quantum information, with phenomena such as quantum entanglement, for data transmission and data compression.
	info.uibk.ac.at /c/c7/c704/qinet/index.html (1613 words)

	MITACS 2004 (Site not responding. Last check: 2007-10-21)
		Effective control of quantum systems will be essential for continued development of information technology; as the sizes of computer components approaches the atomic scale, quantum technologies will be necessary for the storage and processing of information.
		The general objective is to develop novel systems and techniques for information processing, transmission, and security by exploiting the properties of quantum mechanical operations.
		Specific topics within the project are quantum algorithms and complexity theory, quantum information and communication theory, quantum cryptography, and the theory of implementations of quantum information.
	www.mitacs.math.ca /main.php?mid=10000018&pid=78&proid=21 (357 words)

	Introduction to Quantum Information Processing
		Quantum unstructured search may make it possible to solve significantly larger instances of optimization problems such as the scheduling and traveling salesman problems.
		As a result of the capabilities of quantum information, the science of quantum information processing is now a prospering, interdisciplinary field focused on better understanding the possibilities and limitations of the underlying theory, on developing new applications of quantum information and on physically realizing controllable quantum devices.
		In this sense information exists independently of the devices used to represent it, but requires at least one physical representation to be useful.
	www.eskimo.com /~knill/qip/prhtml/prhtml.html (512 words)

	British Computer Society (BCS)
		It can thus be postulated, that if such quantum neural network models as learning systems, can be devised providing an understanding of their actual physics, then the key to new technology, by means of which NP complete problems can be solved, will be to hand.
		Extended models of neurons postulating such additional information processing capabilities and mechanisms by means of which components of neurons, such as dendrites, the principal dendrite, the neuron surface, entropic holes(Maxwell demons) in the surface of the neuron, the neural body, the axon and the synapse and the synaptic interior could all function, already exist
		Here quantum holography, produced by spin echo techniques, describes the resonant coupling of electromagnetic fields with the nuclear quantum spin populations of soft body tissues, so as to output a hologram of the required body slice image as in the form of a diffraction pattern, as is actually the case.
	www.bcs.org.uk /siggroup/cyber/cmg_neur.htm (1550 words)

	Quantum Computation at UC Berkeley
		Welcome to the Quantum Information Theory group at the University of California at Berkeley.
		January 9 - 12, QIP 2001: Fourth Workshop on Quantum Information Processing (Amsterdam, The Netherlands)
		QIP 2002: The Fifth Workshop on Quantum Information Processing (New York, NY, USA)
	quantum.cs.berkeley.edu (197 words)

	Workshop on: QUANTUM INFORMATION PROCESSING FOR QUANTUM COMMUNICATIONS
		The state of a quantum system is perturbed due to the interaction with the environment.
		If some information is obtained then inevitably the system cannot be brought back in the initial state.
		We then look at the difference between in the Fisher information before and after the measurement and show that it is bounded by the perturbation.
	www.qubit.it /upcoming/locandine/guta.html (200 words)

	QiSci (Site not responding. Last check: 2007-10-21)
		One of the biggest puzzles in the foundations of quantum computing is to determine which specific feature of quantum theory is responsible for the exponential speedup with respect to classical computing.
		Whilst the attempt is not entirely successful, in that quantum computations cannot be thought of as merely tests of propositions in SQL, a method for deciding the truth of a proposition in SQL with nonzero probability of success on a quantum computer does exist.
		Essential properties of the system, such as the maximum information throughput and the signal-to-interference ratio of common receivers, are determined by the eigenvalues of the matrices involved.
	www.qinfo.org (1564 words)

	MagiQ Technologies, Inc.: What is Quantum Information Processing (Site not responding. Last check: 2007-10-21)
		Quantum Information Processing is a young and rapidly growing field of research at the intersection of physics, mathematics, and computer science.
		Its ultimate goal is to harness quantum physics to conceive (and ultimately build) "quantum" computers that could dramatically exceed the capabilities of today's "classical" computers.
		An illustrative example of the power of a quantum computer is its ability to find the prime factors of a large integer efficiently, thus breaking the foundation of security of standard encryption schemes including the RSA crypto-system.
	www.magiqtech.com /whatisqip.html (144 words)

	A2 Consortium
		Welcome to the home page of the A2 Quantum Information Consortium, a network of research groups conducting theoretical research in quantum information processing.
		Quantum Theory Group, Potsdam (M. Wilkens) (managing node).
		Quantum Information Theory Group, TU Berlin (K.-E. Hellwig).
	www.a2.qipc.org (324 words)

	[No title]
		Quantum computation is an emerging interdisciplinary field, which takes advantage of concepts from both information theory and quantum mechanics.
		In fact, a quantum computer represents a complex system of many coupled qubits, which in general can be viewed as a many-body interacting quantum system.
		On the other hand, qubit or spin interactions have also been studied extensively in the field of quantum chaos, in which typical problems are decoherence and the quantum-to-classical transition, subjects that are also essential for any realistic implementation of a quantum computer.
	scienze-como.uninsubria.it /benenti/varenna2005.html (421 words)

	Les Houches Summer School Session 73Les Houches Summer School session 73 affiche
		The physics of simple quantum systems is presently the subject of fast and new developments in the field of quantum information.
		On the other hand, in many different fields such as quantum optics, NMR and solid state physics technological advances now make possible the controlled quantum manipulations and entanglement of a few "qubits" made of single photons, atoms, ions, molecules or electrons.
		The essence of quantum logic: entanglement, is indeed a very subtle property, not yet fully understood, and also an experimentally demanding one, subjected to increasing decoherence rates as far as it involves an increasing number of qubits.
	www.lkb.ens.fr /recherche/qedcav/english/perso/brune/Houches/Quent.htm (557 words)

	quantum_optics (Site not responding. Last check: 2007-10-21)
		Quantum optics, or study of quantum properties of light, has lead in the past ten years to the development of new experimental and theoretical tools that go beyond traditional non-linear optics.
		The goals are on one hand a better understanding of light-matter interaction, and on the other hand the implementation of new techniques capable of overcoming the noise limitations imposed by the quantum nature of light on the efficiency of ultra-sensitive optical devices, like in spectroscopy or optical telecommunication.
		Presently quantum optics provides useful tools and methods for the broader field of quantum information processing.
	www.iota.u-psud.fr /%7Egrangier/Quantum_optics.html (140 words)

	Quantum Computation/Cryptography at Los Alamos (Site not responding. Last check: 2007-10-21)
		The idea of quantum computation and cryptography is to use the laws of quantum mechanics for either computing or exchange secrets messages.
		Proceedings of the Quantum Coherence and Decoherence, Santa-Barbara, Dec 15-18, 1996.
		that allows the quantum state of a system to be transported from one location to another, without moving through the intervening space.
	qso.lanl.gov /qc (349 words)

	CITRIS Project: Quantum Information Processing (Site not responding. Last check: 2007-10-21)
		On the theory side, we will study issues concerned with the underlying information technology, and issues that arise when quantum information theory is applied to real physical systems, especially to gas phase systems using atoms and light fields.
		The similarity in the technology used in our quantum computation and photon generation schemes presents the long term possibility of integrating the two systems, so that either quantum computers will be able to communicate via photons or quantum computers can be used as repeater stages in the transmission of quantum photon states.
		Furthermore, the simplicity and scalability of atom based approaches to quantum computing will be an aid to the theory, and help clarify the challenges to quantum computing implementations in general.
	www.citris.berkeley.edu /projmatrix/project/display.action?project.id=84 (225 words)

	NIST: Physics Laboratory's - Quantum Information
		The starting point for quantum information at NIST was in 1995 when the Ion Storage Group demonstrated the first quantum-logic gate.
		The prototype device will be used to provide a proof-in-principle of the ability to process quantum information, demonstrate stabilized quantum memory, and quantum error correction, quantum repeater without output coupling, and to implement optimal quantum strategies for precision measurement.
		This effort entitled A Scalable Quantum Information Network is led by Carl Williams and includes representatives of the Electronics and Electrical Engineering Laboratory, the Information Technology Laboratory, and the Physics Laboratory.
	qubit.nist.gov (943 words)

	AG Rempe: Quantum Information Processing
		For quantum information processing, individual particles like photons, atoms or ions are preferably used as carriers of information.
		These entities allow one to store and process a single quantum bit (qubit) in a superposition of eigenstates.
		Therefore, our goal is to realize prototypes of quantum interfaces between ultracold atoms and light, using a coupling mechanism that is based on cavity QED.
	www.mpq.mpg.de /qdynamics/projects/pistol/QIPmain.html (181 words)

	Hewlett Cites Progress on Quantum Computer - New York Times (Site not responding. Last check: 2007-10-21)
		Quantum computers are machines based on the principles of quantum mechanics, a branch of physics that describes the quirky world of subatomic particles where both yes and no can simultaneously be true.
		The new strategy for designing a quantum computer was outlined in an article researchers at Hewlett-Packard published in the May issue of The New Journal of Physics.
		Several quantum computing scientists said that the paper offered an interesting theoretical proposal but that there were significant obstacles to building a useful system.
	www.nytimes.com /2005/07/01/technology/01hewlett.html?ex=1277870400&en=e7ce267dd353f7b1&ei=5090&partner=rssuserland&emc=rss (792 words)

	New Scientist Laser pulses could power quantum logic gate - Breaking News
		Quantum computers should, for example, be able to perform multiple calculations at once simply by exploiting the fact that quantum particles can simultaneously occupy two distinct states.
		There are numerous competing schemes for building quantum computers and several research groups have succeeded in building very simple quantum calculating devices.
		Information on the quantum state of qubits would be combined in the beam, and then processed by measuring the beam.
	www.newscientist.com /channel/fundamentals/quantum-world/dn7624 (503 words)

	PhysicsWeb - Events - Practical realisations of quantum information processing (Site not responding. Last check: 2007-10-21)
		Quantum information processing exploits the intrinsic parallelism and vast state space capacity of quantum mechanics, and has the potential to revolutionise computing.
		Its practical realisation is formidible as the necessary quantum resources are extrememly sensitive to environmental disturbance.
		This meeting will focus on practical methods for generating, storing and transporting quantum information, and on realisations of quantum logic elements such as gates and data buses.
	physicsweb.org /events/2089 (96 words)

	Quantum Bits
		This is Sébastien Paquet's oft-neglected weblog on quantum information processing.
		Research in Quantum Computing and Information, all in a nice geography-based tree, with links to groups, people and example papers.
		Quantum Information Science and Technology Roadmapping Project: "The overall purpose of this roadmap is to help facilitate the progress of quantum computation research towards the quantum computer science era.
	quantumbits.blogspot.com (396 words)

	WEH Summer School "Fundamentals of Quantum Information Processing
		Furthermore, coherent manipulation of quantum systems is no longer confined to the atomic and molecular domain but has also been demonstrated for nanoscale solid state devices.
		The aim of this school is to introduce an international audience of graduate students and young postdocs to quantum information processing.
		Among the topics covered by extended lectures are: theoretical concepts like entanglement, quantum algorithms, quantum error correction and decoherence; applications including quantum communication and quantum cryptography; realizations in optical and solid state systems.
	www.physik.uni-augsburg.de /weh-school (281 words)

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