http://www.physorg.com/ en-us Physorg.com internet news portal provides the latest news on science including: Physics, Nanotechnology, Life Sciences, Space Science, Earth Science, Environment, Health and Medicine. (PhysOrg.com) -- While quantum dots have existed since the 1980s, only in the past decade have physicists successfully created lateral few-electron single quantum dots. These quantum dots enable physicists to manipulate quantum spins, which could be used as qubits for quantum information applications. Along these lines, a team of physicists from the National Research Council in Canada who were responsible for the original lateral few-electron single quantum dot have recently designed a new few-electron triple quantum dot circuit, and demonstrated that all three quantum dots can be tuned in resonance. http://www.physorg.com/news178789034.html Nanotechnology Mon, 30 Nov 2009 09:10:01 EST news178789034 To exploit the quantum world to the fullest, a key commodity is entanglement -the spooky, distance-defying link that can form between objects such as atoms even when they are completely shielded from one another. Now, physicists at the Joint Quantum Institute (JQI), a collaborative organization of the National Institute of Standards and Technology and the University of Maryland, have developed a promising new source of entangled photons using quantum dots tweaked with a laser. The JQI technique may someday enable more compact and convenient sources of entangled photon pairs than presently available for quantum information applications such as the distribution of "quantum keys" for encrypting sensitive messages. http://www.physorg.com/news177763808.html Physics Wed, 18 Nov 2009 10:50:39 EST news177763808 In an international first, scientists from the Institute of Quantum Optics and Quantum Information (IQOQI, Austria) produced a Bose-Einstein condensate of the alkaline-earth element strontium, thus narrowly winning an international competition between many first-rate scientific groups. 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. http://www.physorg.com/news176994672.html Physics Mon, 09 Nov 2009 13:11:51 EST news176994672 (PhysOrg.com) -- For the first time, physicists have demonstrated the quantum entanglement of three light beams, all of different wavelengths. Entanglement of two light beams of different wavelengths has already been demonstrated, but the researchers explain that going beyond two beams is important since three beams can serve as connections at the nodes of a quantum network. http://www.physorg.com/news174133022.html Physics Wed, 07 Oct 2009 11:17:35 EST news174133022 Exploiting quantum mechanics for transmitting information is a tantalizing possibility because it promises secure, high speed communications. Unfortunately, the fragility of methods for storing and sending quantum information has so far frustrated the enterprise. Now a team of physicists in Sweden and Poland have shown that photons that encode data have strength in numbers. Their experiment is reported in Physical Review Letters and Physical Review A and highlighted in the October 5 issue of Physics. http://www.physorg.com/news173964594.html Physics Mon, 05 Oct 2009 12:30:22 EST news173964594 A Kansas State University physicist is continuing his study of atomic collisions with the help of a National Science Foundation grant awarded under the American Recovery and Reinvestment Act. http://www.physorg.com/news173529452.html Physics Wed, 30 Sep 2009 11:50:01 EST news173529452 (PhysOrg.com) -- For the first time, physicists have experimentally demonstrated a four-qubit bound-entangled state - a peculiar form of entanglement that cannot be distilled (optimized) by the usual means. However, the scientists have found a novel method for distilling the entanglement by working with two qubits at a time. As the researchers explain, the special properties of bound entanglement could make it a useful quantum resource for new multiparty communication and secret sharing schemes, and the results could also contribute to a deeper understanding of the foundations of quantum mechanics. http://www.physorg.com/news173517599.html Physics Wed, 30 Sep 2009 10:00:01 EST news173517599 (PhysOrg.com) -- Diamonds, it has long been said, are a girl's best friend. But a research team including a physicist from the National Institute of Standards and Technology has recently found that the gems might turn out to be a patient's best friend as well. http://www.physorg.com/news172862154.html Physics Tue, 22 Sep 2009 18:16:51 EST news172862154 (PhysOrg.com) -- A primitive quantum computer that uses single particles of light (photons) whizzing through a silicon chip has performed its first mathematical calculation. This is the first time a calculation has been performed on a photonic chip and it is major step forward in the quest to realise a super-powerful quantum computer. http://www.physorg.com/news171213314.html Physics Thu, 03 Sep 2009 16:15:49 EST news171213314 Scientists at UC Santa Barbara have devised a new type of superconducting circuit that behaves quantum mechanically -- but has up to five levels of energy instead of the usual two. The findings are published in the August 7 issue of Science. http://www.physorg.com/news169221847.html Physics Tue, 11 Aug 2009 15:04:34 EST news169221847 Raising prospects for building a practical quantum computer, physicists at the National Institute of Standards and Technology have demonstrated sustained, reliable information processing operations on electrically charged atoms (ions). The new work, described in the August 6 issue of Science Express, overcomes significant hurdles in scaling up ion-trapping technology from small demonstrations to larger quantum processors. http://www.physorg.com/news168791155.html Physics Thu, 06 Aug 2009 15:26:23 EST news168791155 (PhysOrg.com) -- In comparison to classical physics, quantum physics predicts that the properties of a quantum mechanical system depend on the measurement context, i.e. whether or not other system measurements are carried out. A team of physicists from Innsbruck, Austria, led by Christian Roos and Rainer Blatt, have for the first time proven in a comprehensive experiment that it is not possible to explain quantum phenomena in non-contextual terms. The scientists report on their findings in the current issue of Nature. http://www.physorg.com/news167461123.html Physics Wed, 22 Jul 2009 13:00:04 EST news167461123 Scientists at MIT have figured out a key step toward the design of quantum information networks. The results are reported in the July 20th issue of Physical Review Letters and highlighted in APS's on-line journal Physics. http://www.physorg.com/news167278799.html Physics Mon, 20 Jul 2009 03:20:39 EST news167278799 (PhysOrg.com) -- Usually when physicists talk about quantum teleportation, they're referring to the transfer of quantum states from one particle to another without a physical link. Now, physicists have investigated a slightly different form of teleportation, in which they teleport a quantum field, or an entire beam of light, from one location to another. This kind of "strong" teleportation is required for some quantum information applications, and could lead to the teleportation of quantum images. http://www.physorg.com/news166779852.html Physics Tue, 14 Jul 2009 09:50:01 EST news166779852 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. http://www.physorg.com/news166450015.html Technology Fri, 10 Jul 2009 13:16:18 EST news166450015 A team led by Yale University researchers has created the first rudimentary solid-state quantum processor, taking another step toward the ultimate dream of building a quantum computer. http://www.physorg.com/news165418586.html Physics Sun, 28 Jun 2009 14:37:16 EST news165418586 A team of physicists and engineers have demonstrated all-fibre quantum logic, where single photons are generated and used to perform the controlled-NOT quantum logic gate in optical fibres with high fidelity. http://www.physorg.com/news162736415.html Physics Thu, 28 May 2009 13:34:04 EST news162736415 (PhysOrg.com) -- "For certain tasks, quantum computers are more powerful than their classical counterparts. The task to be performed is the same for quantum or classical systems. However, the former ones can do it in a more efficient way," David Gross tells PhysOrg.com. "But we can`t pinpoint the exact reason why a quantum computer is more powerful. Until now, it has been accepted that the reason is entanglement. But entanglement is the easy answer, and we have discovered that it is not so simple." http://www.physorg.com/news162468404.html Physics Mon, 25 May 2009 11:07:15 EST news162468404 Scientists have devised a new technique for real-time detection of freely moving individual neutral atoms that is more than 99.7% accurate and sensitive enough to discern the arrival of a single atom in less than one-millionth of a second, about 20 times faster than the best previous methods. http://www.physorg.com/news161787101.html Physics Sun, 17 May 2009 13:52:16 EST news161787101 Researchers from the Kavli Institute of NanoScience in Delft are the first to have successfully captured a single electron in a highly tunable carbon nanotube double quantum dot. This was made possible by a new approach for producing ultraclean nanotubes. Moreover, the team of researchers, under the leadership of Spinoza winner Leo Kouwenhoven, discovered a new sort of tunneling as a result of which electrons can fly straight through obstacles. The results of the research were published by Nature Nanotechnology on April 5, 2009. http://www.physorg.com/news161521344.html Nanotechnology Thu, 14 May 2009 12:03:58 EST news161521344 Scientists at the California Institute of Technology (Caltech) 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 surprisingly 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. http://www.physorg.com/news161026685.html Physics Fri, 08 May 2009 18:38:40 EST news161026685 Austrian physicists say a breakthrough in next-generation quantum cryptography could allow encrypted messages to be bounced off satellites, the British journal Nature reported Sunday. http://www.physorg.com/news160593524.html Physics Sun, 03 May 2009 18:19:09 EST news160593524 (PhysOrg.com) -- The idea that far distant particles can somehow 'talk' to each other worried Einstein so much that he called it 'spooky action at a distance'. http://www.physorg.com/news160047045.html Physics Mon, 27 Apr 2009 10:32:17 EST news160047045 (Santa Barbara, Calif.) -- In the quest for quantum information processing, diamonds may be a physicist's best friend. http://www.physorg.com/news159024814.html Physics Wed, 15 Apr 2009 14:37:09 EST news159024814 (PhysOrg.com) -- When physicists entangle light, they usually use nonlinear crystals as the source. However, it`s difficult to control the entanglement generation process in a bulk crystal, and so scientists have been looking for a more fundamental source of entangled light. Now, they may have found a candidate: Bose-Einstein condensates. http://www.physorg.com/news158408510.html Physics Wed, 08 Apr 2009 11:22:27 EST news158408510 (PhysOrg.com) -- Quantum information processing is one of the hottest areas of science and technology right now. Making quantum information processing scalable is an important part of the efforts involved with regard to practical quantum computing. `By tuning the gap of a superconducting qubit, we can allow different types of coupling for use in quantum information processing,` Hans Mooij tells PhysOrg.com. http://www.physorg.com/news156769523.html Physics Fri, 20 Mar 2009 12:05:56 EST news156769523 (PhysOrg.com) -- A team of physicists and engineers has demonstrated an optical device that filters two particles of light (or photons) based on the correlations between their polarisation that are only allowed in the seemingly bizarre quantum world. This so called "entanglement filter" passes the pair of photons only if they inhabit the same quantum state, without the user (or anything else) ever knowing what that state is. http://www.physorg.com/news151857190.html Physics Thu, 22 Jan 2009 14:34:53 EST news151857190 (PhysOrg.com) -- For the first time, scientists have successfully teleported information between two separate atoms in unconnected enclosures a meter apart - a significant milestone in the global quest for practical quantum information processing. http://www.physorg.com/news151856605.html Physics Thu, 22 Jan 2009 14:24:33 EST news151856605 (PhysOrg.com) -- When most people think of quantum communication, they think in terms of private communication channels - the ability to send messages without a third-party deciphering them. Indeed, quantum cryptography represents a method of sending information that cannot be eavesdropped upon. Without the proper key for decoding the intercepted message, all an interloper would receive is gibberish. To make quantum cryptography work, Graeme Smith tells PhysOrg.com, `We try to understand the protocols and use specially designed channels to send messages and also to shed light on the general theory of privacy in quantum mechanics.` http://www.physorg.com/news151590458.html Physics Mon, 19 Jan 2009 12:28:18 EST news151590458 (PhysOrg.com) -- It is a truth universally acknowledged that quantum computing must have entanglement. http://www.physorg.com/news147698804.html Physics Fri, 05 Dec 2008 11:26:44 EST news147698804