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 Physicists at UC Santa Barbara have made an important advance in electrically controlling quantum states of electrons, a step that could help in the development of quantum computing. The work is published online today on the Science Express Web site. http://www.physorg.com/news177938057.html Physics Fri, 20 Nov 2009 11:18:55 EST news177938057 (PhysOrg.com) -- For more than 50 years, physicists have been intrigued by the concept of closed time-like curves (CTCs). Because a CTC returns to its starting point, it raises the possibility of traveling backward in time. More recently, physicists have theorized that CTC-assisted computers could enable ideal quantum state discrimination, and even make classical computers (with CTCs) equally as powerful as quantum computers. However, a new study argues that CTCs, if they exist, might actually provide much less computational benefit than previously thought. http://www.physorg.com/news175421039.html Physics Thu, 22 Oct 2009 10:40:01 EST news175421039 (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 Researchers at UC Santa Barbara 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. http://www.physorg.com/news162814379.html Physics Fri, 29 May 2009 11:13:27 EST news162814379 (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 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) -- For the first time, scientists have succeeded in measuring and controlling the lifetime of quantum states with potential use in optoelectronic chips. This achievement is highly significant for the ongoing development of this cutting-edge technology. The breakthrough involved measuring the intersubband relaxation time of charge states in silicon-germanium SiGe structures on a picosecond scale. Experiments have also shown that it is possible to control and extend these times. As a result, this body of work - currently published in Physical Review Letters and supported by the Austrian Science Fund FWF - represents a major advance in the development of data processing based on optoelectronic chips. http://www.physorg.com/news158922775.html Physics Tue, 14 Apr 2009 10:13:47 EST news158922775 Scientists from the University of Innsbruck, Austria, led by Rudolf Grimm offer new insights into the extremely complex few-body problem. For the first time, the quantum physicists provide evidence of universal four-body states that are closely connected to Efimov states, in an ultracold sample of cesium atoms. The scientists have just published their findings in the journal Physical Review Letters. http://www.physorg.com/news158310375.html Physics Tue, 07 Apr 2009 08:06:42 EST news158310375 (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) -- Physicists have taken a step closer to realizing long-distance quantum communication, in which a quantum state is transferred from one location to another by becoming entangled with a traveling photon. http://www.physorg.com/news142609071.html Physics Tue, 07 Oct 2008 14:37:51 EST news142609071 The odd behavior of a molecule in an experimental silicon computer chip has led to a discovery that opens the door to quantum computing in semiconductors. http://www.physorg.com/news133755402.html Technology Fri, 27 Jun 2008 03:16:42 EST news133755402