http://www.sciencedaily.com/news/computers_math/quantum_computers/ Quantum Computer Research. Read the latest news in developing quantum computers. Full-text, images, free. en-us Wed, 11 Nov 2009 09:05:04 EST Wed, 11 Nov 2009 09:05:04 EST 60 http://www.sciencedaily.com/images/logosmall.gif http://www.sciencedaily.com/news/computers_math/quantum_computers/ For more science articles, visit ScienceDaily. http://www.sciencedaily.com/releases/2009/10/091029151439.htm Researchers have succeeded in getting hold of the environment of a quantum particle. This allows them to exercise greater control over a single electron, and brings the team of researchers a step closer still to the super-fast quantum computer. Mon, 09 Nov 2009 08:00:00 EST http://www.sciencedaily.com/releases/2009/10/091029151439.htm http://www.sciencedaily.com/releases/2009/11/091109121343.htm In an international first, scientists have produced a Bose-Einstein condensate of the alkaline-earth element strontium. Choosing the isotope 84Sr, which has received little attention so far, proved to be the right choice for the breakthrough. It can now be regarded as an ideal candidate for future experiments with atomic two-electron systems. Mon, 09 Nov 2009 00:00:00 EST http://www.sciencedaily.com/releases/2009/11/091109121343.htm http://www.sciencedaily.com/releases/2009/11/091104140812.htm Physicists have created a quantum gas microscope that can be used to observe single atoms at temperatures so low the particles follow the rules of quantum mechanics, behaving in bizarre ways. The work represents the first time scientists have detected single atoms in a crystalline structure made solely of light, called a Bose Hubbard optical lattice. Wed, 04 Nov 2009 00:00:00 EST http://www.sciencedaily.com/releases/2009/11/091104140812.htm http://www.sciencedaily.com/releases/2009/10/091027132959.htm Researchers are investigating long-distance, mobile optical links imperative for secure quantum communications capabilities in theater. They have conducted high data-rate experiments using an optical laser link, a tool which exploits the quantum noise of light for higher security. Mon, 02 Nov 2009 14:00:00 EST http://www.sciencedaily.com/releases/2009/10/091027132959.htm http://www.sciencedaily.com/releases/2009/10/091031003511.htm What are the odds that your digital identity will be stolen by cyber criminals? Why do bank payment systems crash when everybody is trying to pay for Christmas gifts by credit card? Cyber criminals are everywhere. Now, help is just a click away. Researchers have developed a new, ultrafast digital signature scheme that is 17,000 times faster than current systems for verification, and 10,000 times faster in providing a digital signature. Sun, 01 Nov 2009 11:00:00 EST http://www.sciencedaily.com/releases/2009/10/091031003511.htm http://www.sciencedaily.com/releases/2009/10/091027162001.htm Scientists have always attempted to develop spin transistors by incorporating local ferromagnets into device architectures. A far better and practical way to manipulate the orientation of an electron's spin would be by using purely electrical means. Researchers have now found an innovative and novel way to control an electron's spin orientation using purely electrical means. Fri, 30 Oct 2009 17:00:00 EDT http://www.sciencedaily.com/releases/2009/10/091027162001.htm http://www.sciencedaily.com/releases/2009/10/091015133117.htm In the quest for smaller, faster computer chips, researchers are increasingly turning to quantum mechanics -- the exotic physics of the small. The problem: the manufacturing techniques required to make quantum devices have been equally exotic. That is, until now. Sat, 17 Oct 2009 17:00:00 EDT http://www.sciencedaily.com/releases/2009/10/091015133117.htm http://www.sciencedaily.com/releases/2009/10/091005123050.htm The qubits that carry quantum information are typically fragile, but a new method of combing six photons leads to robust qubits that are immune to many of the effects that threaten to scramble quantum data. Sun, 11 Oct 2009 11:00:00 EDT http://www.sciencedaily.com/releases/2009/10/091005123050.htm http://www.sciencedaily.com/releases/2009/09/090929133121.htm Physicists have created the first atomic-scale maps of quantum dots, a major step toward the goal of producing "designer dots" that can be tailored for specific applications. Wed, 30 Sep 2009 17:00:00 EDT http://www.sciencedaily.com/releases/2009/09/090929133121.htm http://www.sciencedaily.com/releases/2009/09/090923151730.htm Physicists have made an important advance in quantum mechanics, demonstrating that they could detect the quantum correlations in the results of measurements of entangled quantum bits, using a superconducting electrical circuit. Thu, 24 Sep 2009 17:00:00 EDT http://www.sciencedaily.com/releases/2009/09/090923151730.htm http://www.sciencedaily.com/releases/2009/09/090911132308.htm A new way of storing and 'echoing' pulses of light has been discovered by a team from Australia, allowing bursts of laser to work as a flexible optical memory and potentially assist in extending the range of quantum information systems. Mon, 14 Sep 2009 11:00:00 EDT http://www.sciencedaily.com/releases/2009/09/090911132308.htm http://www.sciencedaily.com/releases/2009/08/090827141338.htm Scientists have shown for the first time that the spectroscopic "fingerprint" of high-temperature superconductivity remains intact well above the super chilly temperatures at which these materials carry current with no resistance. This confirms that certain conditions necessary for superconductivity exist at the warmer temperatures that would make these materials practical for energy-saving applications -- if scientists can figure out how to get the current flowing. Fri, 28 Aug 2009 14:00:00 EDT http://www.sciencedaily.com/releases/2009/08/090827141338.htm http://www.sciencedaily.com/releases/2009/07/090730121212.htm Computer scientists are working to prevent quantum computers from compromising today's online security. Thu, 13 Aug 2009 05:00:00 EDT http://www.sciencedaily.com/releases/2009/07/090730121212.htm http://www.sciencedaily.com/releases/2009/08/090806141508.htm Raising prospects for building a practical quantum computer, physicists have demonstrated sustained, reliable information processing operations on electrically charged atoms (ions). The new work overcomes significant hurdles in scaling up ion-trapping technology from small demonstrations to larger quantum processors. Mon, 10 Aug 2009 14:00:00 EDT http://www.sciencedaily.com/releases/2009/08/090806141508.htm http://www.sciencedaily.com/releases/2009/07/090730141607.htm Physicists have shown that electrons in narrow wires can divide into two new particles called spinons and a holons. Fri, 31 Jul 2009 08:00:00 EDT http://www.sciencedaily.com/releases/2009/07/090730141607.htm http://www.sciencedaily.com/releases/2009/07/090720082642.htm Scientists in Brazil report the controllable formation of quantum turbulence in an ultra-cold atom gas. The research makes it easier to characterize quantum turbulence -- and potentially even classical turbulence -- because it is possible to tune many characteristics of the cold-atom gas. Tue, 28 Jul 2009 17:00:00 EDT http://www.sciencedaily.com/releases/2009/07/090720082642.htm http://www.sciencedaily.com/releases/2009/07/090720080904.htm Scientists have figured out a key step toward the design of quantum information networks. A quantum network – in which memory devices that store quantum states are interconnected with quantum information processing devices – is a prototype for designing a quantum internet. Tue, 28 Jul 2009 14:00:00 EDT http://www.sciencedaily.com/releases/2009/07/090720080904.htm http://www.sciencedaily.com/releases/2009/07/090722142824.htm In comparison to classical physics, quantum physics predicts that the properties of a quantum mechanical system depend on the measurement context, i.e., whether other system measurements are carried out. Physicists have for the first time proven in a comprehensive experiment that it is not possible to explain quantum phenomena in non-contextual terms. Thu, 23 Jul 2009 02:00:00 EDT http://www.sciencedaily.com/releases/2009/07/090722142824.htm http://www.sciencedaily.com/releases/2009/07/090716093526.htm An astrophysics experiment in America has demonstrated how fundamental research in one subject area can have a profound effect on work in another as the instruments used for the Laser Interferometer Gravitational-Wave Observatory (LIGO) pave the way for quantum experiments on a macroscopic scale. Sat, 18 Jul 2009 11:00:00 EDT http://www.sciencedaily.com/releases/2009/07/090716093526.htm http://www.sciencedaily.com/releases/2009/07/090715112031.htm In his discussion of accelerated motion on page 60 of "The Meaning of Relativity," Albert Einstein made an approximation that allowed him to develop the theory of relativity further. Einstein apparently never had the opportunity to check his original approximation. Now, a physicist has uncovered some clues about the basis of Einstein's theories and presented a more general approximation, which may better link quantum physics with classical physics. Thu, 16 Jul 2009 17:00:00 EDT http://www.sciencedaily.com/releases/2009/07/090715112031.htm http://www.sciencedaily.com/releases/2009/07/090709095420.htm Since its discovery a few years ago, graphene has climbed to the top of the heap of new materials poised to transform the electronics and nanotechnology landscape. Now scientists have made the first measurement of a fundamental property of graphene, known as quantum capacitance. This crucial variable should prove invaluable to researchers pushing the existing limits of innovation in microchips, chemical sensing instruments, biosensors, ultracapacitance devices and flexible displays. Wed, 15 Jul 2009 08:00:00 EDT http://www.sciencedaily.com/releases/2009/07/090709095420.htm http://www.sciencedaily.com/releases/2009/07/090710092522.htm Quantum technologies have become the Holy Grail of the IT industry with research projects springing up all over Europe. Now a major effort is being made to spur development by adopting a coordinated, structured approach. Tue, 14 Jul 2009 02:00:00 EDT http://www.sciencedaily.com/releases/2009/07/090710092522.htm http://www.sciencedaily.com/releases/2009/07/090709140806.htm An atomic "coin" can display a superposition of heads and tails when it has been thrown. If you leave the decision where a quantum particle should go to a coin like this, you get unusual effects. For the first time, physicists have demonstrated these effects in an experiment with caesium. Mon, 13 Jul 2009 14:00:00 EDT http://www.sciencedaily.com/releases/2009/07/090709140806.htm http://www.sciencedaily.com/releases/2009/07/090707111753.htm Physicists have overcome a hurdle in quantum computer development, having devised a viable way to manipulate a single "bit" in a quantum processor without disturbing the information stored in its neighbors. The approach, which makes novel use of polarized light to create "effective" magnetic fields, could bring the long-sought computers a step closer to reality. Tue, 07 Jul 2009 20:00:00 EDT http://www.sciencedaily.com/releases/2009/07/090707111753.htm http://www.sciencedaily.com/releases/2009/07/090706113702.htm String theory has come under fire in recent years. Promises have been made that have not been lived up to. Theoretical physicists have now for the first time used string theory to describe a physical phenomenon -- the quantum-critical state of electrons leading to high-temperature superconductivity. Tue, 07 Jul 2009 14:00:00 EDT http://www.sciencedaily.com/releases/2009/07/090706113702.htm http://www.sciencedaily.com/releases/2009/07/090702080119.htm Researchers have successfully created an optical transistor from a single molecule. This has brought them one step closer to an optical computer. Fri, 03 Jul 2009 14:00:00 EDT http://www.sciencedaily.com/releases/2009/07/090702080119.htm http://www.sciencedaily.com/releases/2009/07/090702075921.htm Researchers from across Europe have united to build the largest quantum key distribution network ever built. The efforts of 41 research and industrial organizations were realized as secure, quantum encrypted information was sent over an eight node, mesh network. Fri, 03 Jul 2009 02:00:00 EDT http://www.sciencedaily.com/releases/2009/07/090702075921.htm http://www.sciencedaily.com/releases/2009/07/090701103004.htm A novel ion trap could usher in a new generation of applications, because the device holds promise as a stylus for sensing very small forces or for an interface for efficient transfer of individual light particles for quantum communications. Wed, 01 Jul 2009 17:00:00 EDT http://www.sciencedaily.com/releases/2009/07/090701103004.htm http://www.sciencedaily.com/releases/2009/06/090628171949.htm Researchers have created the first rudimentary solid-state quantum processor, and used the two-qubit superconducting chip to successfully run elementary algorithms, demonstrating quantum information processing with a solid-state device for the first time. Mon, 29 Jun 2009 11:00:00 EDT http://www.sciencedaily.com/releases/2009/06/090628171949.htm http://www.sciencedaily.com/releases/2009/06/090624152824.htm Physicists have found a way to drastically prolong the shelf life of quantum bits, the 0s and 1s of quantum computers. Thu, 25 Jun 2009 17:00:00 EDT http://www.sciencedaily.com/releases/2009/06/090624152824.htm http://www.sciencedaily.com/releases/2009/06/090622103909.htm Physicists have developed a new tool that can be used to search for quantum effects in an ordinary object. Tue, 23 Jun 2009 14:00:00 EDT http://www.sciencedaily.com/releases/2009/06/090622103909.htm http://www.sciencedaily.com/releases/2009/06/090615144431.htm Move over, silicon -- it may be time to give the Valley a new name. Physicists have confirmed the existence of a type of material that could one day provide dramatically faster, more efficient computer chips. Tue, 16 Jun 2009 11:00:00 EDT http://www.sciencedaily.com/releases/2009/06/090615144431.htm http://www.sciencedaily.com/releases/2009/06/090615152926.htm Technologies that exploit the unique weirdness of quantum mechanics could debut in the very near future, thanks to the groundbreaking work of a huge European research consortium. Tue, 16 Jun 2009 02:00:00 EDT http://www.sciencedaily.com/releases/2009/06/090615152926.htm http://www.sciencedaily.com/releases/2009/06/090612122453.htm A consortium of European researchers is solving some of the fundamental obstacles blocking real quantum computing applications in the short term. At the same time, it is helping to pave the way to a quantum computer. Sun, 14 Jun 2009 05:00:00 EDT http://www.sciencedaily.com/releases/2009/06/090612122453.htm http://www.sciencedaily.com/releases/2009/06/090608095042.htm A team of physicists and engineers has demonstrated exquisite control of single particles of light -- photons -- on a silicon chip to make a major advance towards long-sought-after quantum technologies, including super-powerful quantum computers and ultra-precise measurements. Wed, 10 Jun 2009 20:00:00 EDT http://www.sciencedaily.com/releases/2009/06/090608095042.htm http://www.sciencedaily.com/releases/2009/05/090527130836.htm Scientists have demonstrated that, counter to classical Newtonian mechanics, an entire collection of superconducting electrons in an ultrathin superconducting wire is able to "tunnel" as a pack from a state with a higher electrical current to one with a notably lower current, providing more evidence of the phenomenon of macroscopic quantum tunneling. Tue, 09 Jun 2009 08:00:00 EDT http://www.sciencedaily.com/releases/2009/05/090527130836.htm http://www.sciencedaily.com/releases/2009/06/090603131429.htm Physicists have demonstrated entanglement -- a phenomenon peculiar to the atomic-scale quantum world -- in a mechanical system similar to those in the macroscopic everyday world. The work extends the boundaries of the arena where quantum behavior can be observed and shows how laboratory technology might be scaled up to build a functional quantum computer. Thu, 04 Jun 2009 23:00:00 EDT http://www.sciencedaily.com/releases/2009/06/090603131429.htm http://www.sciencedaily.com/releases/2009/05/090528135246.htm A team of physicists and engineers have demonstrated all-fiber quantum logic, where single photons are generated and used to perform the controlled-NOT quantum logic gate in optical fibers with high fidelity. Thu, 04 Jun 2009 14:00:00 EDT http://www.sciencedaily.com/releases/2009/05/090528135246.htm http://www.sciencedaily.com/releases/2009/05/090529093155.htm Researchers have recently demonstrated a breakthrough in the quantum control of photons, the energy quanta of light. This is a significant result in quantum computation, and could eventually have implications in banking, drug design, and other applications. Sun, 31 May 2009 08:00:00 EDT http://www.sciencedaily.com/releases/2009/05/090529093155.htm http://www.sciencedaily.com/releases/2009/05/090508135020.htm Scientists have developed an efficient method to detect entanglement shared among multiple parts of an optical system. They show how entanglement, in the form of beams of light simultaneously propagating along four distinct paths, can be detected with a small number of measurements. Entanglement is an essential resource in quantum information science, which is the study of advanced computation and communication based on the laws of quantum mechanics. Tue, 12 May 2009 23:00:00 EDT http://www.sciencedaily.com/releases/2009/05/090508135020.htm http://www.sciencedaily.com/releases/2009/04/090427102229.htm Physicists have harnessed the phenomenon, "spooky action at a distance," to shed light on another unusual and previously difficult aspect of quantum physics -- that of distinguishing between two similar quantum devices. Sun, 03 May 2009 05:00:00 EDT http://www.sciencedaily.com/releases/2009/04/090427102229.htm http://www.sciencedaily.com/releases/2009/04/090430065454.htm Quantum cryptography, a completely secure means of communication, is much closer to being used practically as researchers have now developed high speed detectors capable of receiving information with much higher key rates, thereby able to receive more information faster. Sat, 02 May 2009 17:00:00 EDT http://www.sciencedaily.com/releases/2009/04/090430065454.htm http://www.sciencedaily.com/releases/2009/04/090422132842.htm Researchers have demonstrated a technique for efficiently suppressing errors in quantum computers, an advance that could eventually make it much easier to build useful versions of these potentially powerful machines that, in theory, could solve important problems that are intractable using today's computers. Mon, 27 Apr 2009 14:00:00 EDT http://www.sciencedaily.com/releases/2009/04/090422132842.htm http://www.sciencedaily.com/releases/2009/04/090423205457.htm Scientists have turned one of the key problems with quantum entangled systems -- that they are easily 'disturbed' by their environment -- into an advantage which promises quantum sensors that are fundamentally more sensitive than their conventional counterparts. Fri, 24 Apr 2009 14:00:00 EDT http://www.sciencedaily.com/releases/2009/04/090423205457.htm http://www.sciencedaily.com/releases/2009/04/090415141221.htm In the first demonstration of its kind, researchers have controlled the spin of electrons using a ballistic technique -- bouncing electrons through a microscopic channel of precisely constructed, two-dimensional layer of semiconductor. Mon, 20 Apr 2009 08:00:00 EDT http://www.sciencedaily.com/releases/2009/04/090415141221.htm http://www.sciencedaily.com/releases/2009/04/090416144525.htm Physicists have measured and controlled seemingly forbidden collisions between neutral strontium atoms -- a class of antisocial atoms known as fermions that are not supposed to collide when in identical energy states. The advance makes possible a significant boost in the accuracy of atomic clocks based on hundreds or thousands of neutral atoms. Fri, 17 Apr 2009 08:00:00 EDT http://www.sciencedaily.com/releases/2009/04/090416144525.htm http://www.sciencedaily.com/releases/2009/04/090408140217.htm Physicists have demonstrated a new ion trap that enables ions to go through an intersection at temperatures ten million times cooler than prior similar trips. The demonstration is a step toward scaling up trap technology to build a large-scale quantum computer using ions. Wed, 15 Apr 2009 20:00:00 EDT http://www.sciencedaily.com/releases/2009/04/090408140217.htm http://www.sciencedaily.com/releases/2009/04/090408140219.htm Highlighting another challenge to the development of quantum computers, theorists at NIST have shown that a type of software operation, proposed as a solution to fundamental problems with the computers' hardware, will not function as some designers had hoped. Thu, 09 Apr 2009 14:00:00 EDT http://www.sciencedaily.com/releases/2009/04/090408140219.htm