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. Quantum computing promises ultra-fast communication, computation and more powerful ways to encrypt sensitive information. But trying to use quantum states as carriers of information is an extremely delicate business. Now two physicists have shown, mathematically, how to gently tease out unwanted knots in quantum communication, while keeping the information intact. Their work is reported in the current issue of Physical Review Letters and highlighted with a Viewpoint in Physics. http://www.physorg.com/news178211021.html Physics Mon, 23 Nov 2009 15:20:01 EST news178211021 (PhysOrg.com) -- Many scientists believe that quantum entanglement is required in order for effective quantum computing. Entanglement takes place when there is a connection that exists between two objects - even when they are spatially separated - that allows what happens to one to happen to the other. The link is such that each entangled object cannot be adequately described without its counterpart. So far, entangling qubits for practical use has been difficult, since scientists want to be able to entangle several qubits at once. http://www.physorg.com/news176364815.html Physics Mon, 02 Nov 2009 11:20:01 EST news176364815 (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 (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) -- By greatly amplifying one photon from an entangled photon pair, physicists have theoretically shown that human eyes can be used as detectors to observe quantum effects. Usually, detecting quantum phenomena requires sensitive photon detectors or similar technology, keeping the quantum world far removed from our everyday experience. By showing that it`s possible to perform quantum optics experiments with human eyes as detectors, the physicists can bring quantum phenomena closer to the macroscopic level and to everyday life. http://www.physorg.com/news173423784.html Physics Tue, 29 Sep 2009 09:10:03 EST news173423784 At the quantum level, the atoms that make up matter and the photons that make up light behave in a number of seemingly bizarre ways. Particles can exist in "superposition," in more than one state at the same time (as long as we don't look), a situation that permitted Schrödinger's famed cat to be simultaneously alive and dead; matter can be "entangled" -- Albert Einstein called it "spooky action at a distance" -- such that one thing influences another thing, regardless of how far apart the two are. http://www.physorg.com/news164885583.html Physics Mon, 22 Jun 2009 10:34:04 EST news164885583 A huge 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. http://www.physorg.com/news163995787.html Nanotechnology Fri, 12 Jun 2009 08:30:02 EST news163995787 Physicists at the National Institute of Standards and Technology 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. http://www.physorg.com/news163253992.html Physics Wed, 03 Jun 2009 13:20:26 EST news163253992 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 (PhysOrg.com) -- When it comes to nonlocal correlations, some correlations are more nonlocal than others. As the subject of study for several decades, nonlocal correlations (for example, quantum entanglement) exist between two objects when they can somehow directly influence each other even when separated by a large distance. Because these correlations require `passion-at-a-distance` (a term coined by physicist Abner Shimony), they violate the principle of locality, which states that nothing can travel faster than the speed of light (even though quantum correlations cannot be used to communicate faster than the speed of light). Besides being a fascinating phenomenon, nonlocality can also lead to powerful techniques in computing, cryptography, and information processing. http://www.physorg.com/news160911231.html Physics Thu, 07 May 2009 10:34:35 EST news160911231 (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) -- Pushing the envelope of Albert Einstein's "spooky action at a distance," known as entanglement, researchers at the Joint Quantum Institute (JQI) of the Commerce Department's National Institute of Standards and Technology and the University of Maryland have demonstrated a "quantum buffer," a technique that could be used to control the data flow inside a quantum computer. Quantum computers could potentially speed up or expand present capabilities in decrypting data, searching large databases, and other tasks. The new research is published in the Feb. 12 issue of the journal Nature. http://www.physorg.com/news153681740.html Physics Thu, 12 Feb 2009 17:22:40 EST news153681740 (PhysOrg.com) -- Quantum entanglement, a type of correlation peculiar to quantum objects, has been found to disregard completely the "half-life" rule that is obeyed by all natural processes, such a radioactive decay. http://www.physorg.com/news152899335.html Physics Tue, 03 Feb 2009 16:02:40 EST news152899335 (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) -- 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 (PhysOrg.com) -- Scientists led by Rainer Blatt, Markus Hennrich and Mark Riebe of the Institute for Experimental Physics at Innsbruck University recently succeeded for the first time in realizing a deterministic transfer of entanglement in their lab. They reported this important technique for future quantum computing in the online edition of the acclaimed science journal Nature Physics. http://www.physorg.com/news144250142.html Physics Sun, 26 Oct 2008 14:29:02 EST news144250142