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A quantum computer is any device for computation that makes direct use of distinctively quantum mechanical phenomena, such as superposition and entanglement, to perform operations on data. In a classical (or conventional) computer, the amount of data is measured by bits; in a quantum computer, it is measured by qubits. The basic principle of quantum computation is that the quantum properties of particles can be used to represent and structure data, and that quantum mechanisms can be devised and built to perform operations with this data.
Though quantum computing is still in its infancy, experiments have been carried out in which quantum computational operations were executed on a very small number of qubits. Research in both theoretical and practical areas continues at a frantic pace, and many national government and military funding agencies support quantum computing research, to develop quantum computers for both civilian and national security purposes, such as cryptanalysis. (See Timeline of quantum computing for details on current and past progress.)
It is widely believed that if large-scale quantum computers can be built, they will be able to solve certain problems faster than any classical computer. 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). Some computing architectures such as optical computers may use classical superposition of electromagnetic waves, but without some specifically quantum mechanical resource such as entanglement, they do not share the potential for computational speed-up of quantum computers.
More on [ Quantum computer ]
Information Theory :: Applications
Quantum Computing Closer to Reality After Recent Advances - Compound Semiconductors Online (press release)
Mon, 12 May 2008 19:34:17 -0000
Quantum Computing Closer to Reality After Recent AdvancesCompound Semiconductors Online (press release), TX - May 12, 2008A group of researchers from Stanford and from the University of California Santa Barbara have made a critical breakthrough on the road to quantum computing. ...
Quantum information: An integrated light circuit - Nature.com (subscription)
Thu, 15 May 2008 09:49:41 -0000
Quantum information: An integrated light circuitNature.com (subscription), UK - May 15, 2008Quite generally, the promise of quantum computing lies in making use of the 'parallelism' and 'connectedness' of quantum-mechanical phenomena such as ...
The last laugh on quantum computing - PhysicsToday.org
Wed, 23 Apr 2008 14:23:17 -0000
The last laugh on quantum computingPhysicsToday.org - Apr 23, 2008... moving around each other and behaving as anyons, could be used as the basis for a new form of error-proof quantum computing, it seemed absurd. ...
Focusing on quantum forgetfulness - spectroscopyNOW.com (subscription)
Wed, 14 May 2008 23:11:03 -0000
Focusing on quantum forgetfulnessspectroscopyNOW.com (subscription), UK - May 14, 2008Uncontrollable outside influences, random fluctuations, and other disturbances could undermine the world of quantum computing. Now, researchers have turned ...
Is quantum Internet search on the way? - PhysOrg.com
Tue, 06 May 2008 15:15:09 -0000
Is quantum Internet search on the way?PhysOrg.com, VA - May 6, 2008But what if you could create low-energy quantum access memory (QRAM) that would not only work in terms of quantum computing, but that could also be applied ...
Beating The Codebreakers With Quantum Cryptography - Science Daily (press release)
Mon, 28 Apr 2008 16:47:45 -0000
Beating The Codebreakers With Quantum CryptographyScience Daily (press release) - Apr 28, 2008And the advent of quantum computing will make it even simpler. The gold standard for secret communication will be truly dead. Quantum cryptography solves ...
Artiste Company - Commercial site offering software for Quantum Computer simulation and simulation of other quantum mechanical behavior.
Meta Description: [ Quantum Fog is a Mac program
for teaching and exploring measurement theory in Quantum Mechanics.
It represents physical situations graphically, in terms of
quantum Bayesian nets. It simulates a general purpose quantum computer. ]
Chair of Quantum Informatics - Forum, publications, courses, seminar, links related to Quntum Informatics at Moscow State University.
D-Wave Systems, Inc. - 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.
id Quantique - Site Of id Quantique, Inc. Products include a quantum random number generator,and a quantum cryptography system.
Meta Description: [ id Quantique is the leader in the development of advanced encryption solutions based on quantum and classical cryptograhy. ]
Introduction to Quantum Algorithms - An tutorial on quantum algorithms for those new to the field and who do not have an extensive physics background.
Meta Description: [ Quantum Computing and Shor's Algorithm ]
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Josephson junction qubits by A.C.J. ter haar - The research on Josephson junction quantum bits aims at developing a system of coupled Josephson persistent current qubits for investigating the principles of quantum computation as well as investigating quantum effects in macroscopic systems.
libquantum - A C library for the simulation of a quantum computer. It provides all important operations and the simulation of decoherence effects.
Meta Description: [ Simulation of a quantum computer with a C library ]
MagicQ Technologies Inc. - The home site of the first start up company devoted entirely to quantum computing. No patents or products to date, but of interest by virtue of being first off the block.
QCTalk - QCTalk is the portal where everybody share what he knows about Quantum Computing, Tutorials, Simulators, Discussions..
Meta Description: [ Quantum Computation Talk ]
Qualgorithms - Blog focused on quantum algorithms, the latest quantum computing advances, and interesting research.
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Quantum Computation: a Tutorial - By Samuel L. Braunstein, with links to tutorials on related subjects.
Quantum Computer Emulator (QCE) - A Windows based simulator of quantum computer hardware. Provides an environment to execute quantum algorithms under realistic experimental conditions.
Quantum Computing with Electron Spins in Quantum Dots - A detailled study of using electron spins for quantum computation. Several possible implementations are discussed.
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Quantum Information and Reversible Computing - Frontier Science Research conference. La Jolla, CA, USA; 9--11 October 2004.
Quantum Information Virtual Journal - An academic quality on-line journal dedicated to quantum information. Approximately 30 to 40 new papers per month.
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Qubib (Quantum Bibliography) - A database of selected bibliography in quantum computer science in HTML and Bibtex format.
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Qubib (Quantum Bibliography) - A database of selected bibliography for quantum information science in HTML and Bibtex format.
tmxxine - Open Source Software for Quantum Computing, teleportation between branes and other continuums.
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