http://phys.org/ en-us Phys.org internet news portal provides the latest news on science including: Physics, Nanotechnology, Life Sciences, Space Science, Earth Science, Environment, Health and Medicine. (Phys.org) —In a development that could make the advanced form of secure communications known as quantum cryptography more practical, University of Michigan researchers have demonstrated a simpler, more efficient single-photon emitter that can be made using traditional semiconductor processing techniques. http://phys.org/news284733617.html Physics Tue, 09 Apr 2013 13:40:28 EST news284733617 (Phys.org) —Can worldwide communication ever be fully secure? Quantum physicists believe they can provide secret keys using quantum cryptography via satellite. Unlike communication based on classical bits, quantum cryptography employs the quantum states of single light quanta (photons) for the exchange of data. Heisenberg's uncertainty principle limits the precision with which the position and momentum of a quantum particle can be determined simultaneously, but can also be exploited for secure information transfer. Like its classical counterpart, quantum cryptography requires a shared key with which the parties encode and decode messages. However, quantum mechanical phenomena guarantee the security of quantum key distribution. Because quantum states are fragile, interception of the key by an eavesdropper will alter the behavior properties of the particles, and thus becomes detectable. http://phys.org/news284199561.html Physics Wed, 03 Apr 2013 09:19:40 EST news284199561 (Phys.org) —In a new study, physicists have teleported photonic qubits made of pairs of entangled photons that are generated by an LED containing an embedded quantum dot. The novel set-up has advantages compared to the conventional method of generating entangled photons using a laser, and could lead to a simplified technique for implementing quantum teleportation in quantum information applications. http://phys.org/news282559863.html Physics Fri, 15 Mar 2013 10:30:01 EST news282559863 In this month's special edition of Physics World, focusing on quantum physics, Thomas Jennewein and Brendon Higgins from the Institute for Quantum Computing at the University of Waterloo, Canada, describe how a quantum space race is under way to create the world's first global quantum-communication network. http://phys.org/news281290392.html Physics Thu, 28 Feb 2013 19:00:01 EST news281290392 A Los Alamos National Laboratory quantum cryptography (QC) team has successfully completed the first-ever demonstration of securing control data for electric grids using quantum cryptography. http://phys.org/news280080086.html Physics Thu, 14 Feb 2013 16:01:48 EST news280080086 Physicists at the University of Calgary and at the Institute for Quantum Computing in Waterloo have published new research in Nature Physics which builds on the original ideas of Einstein and adds a new ingredient: a third entangled particle. http://phys.org/news274732238.html Physics Fri, 14 Dec 2012 18:30:46 EST news274732238 (Phys.org)—Researchers from Toshiba and the Department of Engineering have perfected a technique that offers a less expensive way to ensure the security of high-speed fibre-optic cables, protecting communication networks from unauthorized snooping. http://phys.org/news273921382.html Physics Wed, 05 Dec 2012 09:16:39 EST news273921382 Research physicists have demonstrated the first device capable of amplifying the information in a single particle of light without adding noise. http://phys.org/news271936596.html Physics Mon, 12 Nov 2012 09:56:46 EST news271936596 An international collaboration led by physicists of the University of Vienna shines new light on the question of the resources required for achieving quantum information processing. The scientists demonstrate that less demanding resources, which are easier to prepare and to control, can be used for quantum-enhanced technologies. In the experiment, which is published in Nature Physics, the researchers achieve remote quantum state preparation without requiring entanglement as a resource. http://phys.org/news263469892.html Physics Mon, 06 Aug 2012 11:05:12 EST news263469892 A research team led by University of Toronto Professor Hoi-Kwong Lo has found a new quantum encryption method to foil even the most sophisticated hackers. The discovery is outlined in the latest issue of Physical Review Letters. http://phys.org/news252577159.html Physics Mon, 02 Apr 2012 09:19:42 EST news252577159 Quantum cryptography is the ultimate secret message service. Now new research, presented at the 2012 AAAS Annual Meeting, shows it can counter even the ultimate paranoid scenario: when the equipment or even the operator is in the control of a malicious power. http://phys.org/news248864065.html Physics Sun, 19 Feb 2012 08:54:33 EST news248864065 Researchers have succeeded in combining the power of quantum computing with the security of quantum cryptography and have shown that perfectly secure cloud computing can be achieved using the principles of quantum mechanics. They have performed an experimental demonstration of quantum computation in which the input, the data processing, and the output remain unknown to the quantum computer. The international team of scientists will publish the results of the experiment, carried out at the Vienna Center for Quantum Science and Technology (VCQ) at the University of Vienna and the Institute for Quantum Optics and Quantum Information (IQOQI), in the forthcoming issue of Science. http://phys.org/news246202223.html Physics Thu, 19 Jan 2012 14:00:01 EST news246202223 Scientists and engineers have proven the worth of quantum cryptography in telecommunication networks by demonstrating its long-term effectiveness in a real-time network. http://phys.org/news241978085.html Physics Thu, 01 Dec 2011 19:10:01 EST news241978085 (PhysOrg.com) -- In quantum cryptography, scientists use quantum mechanical effects to encrypt and then communicate confidential information. Although quantum cryptography codes are unbreakable in principle, even the best techniques have loopholes in practice that scientists are trying to address. In a recent study, physicists have exposed one of these loopholes by hacking a quantum code, which involved copying a secret quantum key without being detected. http://phys.org/news227808368.html Physics Mon, 20 Jun 2011 17:06:19 EST news227808368 Quantum key distribution (QKD) is an advanced tool for secure computer-based interactions, providing confidential communication between two remote parties by enabling them to construct a shared secret key during the course of their conversation. http://phys.org/news227270551.html Physics Tue, 14 Jun 2011 11:42:45 EST news227270551 Quantum mechanics is famous for saying that a tree falling in a forest when there's no one there doesn't make a sound. Quantum mechanics also says that if anyone is listening, it interferes with and changes the tree. And so the famous paradox: how can we know reality if we cannot measure it without distorting it? http://phys.org/news226241444.html Physics Thu, 02 Jun 2011 14:00:01 EST news226241444 At the Vienna University of Technology, sophisticated atomchips have been used to create pairs of quantum mechanically connected atom-twins. Until now, similar experiments were only possible using photons. http://phys.org/news223562406.html Physics Mon, 02 May 2011 13:40:54 EST news223562406 Scientists in Belgium and Spain have proved for the first time that new systems of quantum cryptology are much safer than current security systems. The study was published in the journal Nature Communications. http://phys.org/news220809472.html Physics Thu, 31 Mar 2011 16:59:46 EST news220809472 A team of physicists in the United Kingdom has taken a giant step toward realizing efficient single-photon sources, which are expected to enable much-coveted completely secure optical communications, also known as "quantum cryptography." The team presents its findings in Applied Physics Letters, a journal published by the American Institute of Physics. http://phys.org/news219509048.html Physics Wed, 16 Mar 2011 15:44:35 EST news219509048 (PhysOrg.com) -- The Cambridge Research Laboratory of Toshiba Research Europe announced today that it has discovered a simple method to prevent detector blinding attacks on quantum cryptography. http://phys.org/news210402289.html Physics Wed, 01 Dec 2010 05:05:52 EST news210402289 When the military needs to send the key to encrypted data across the world, it can't necessarily rely on today's communication lines, where the message could be covertly intercepted. But physicists at the Georgia Institute of Technology in Atlanta are developing a new, more secure way to send such information across far distances, using existing cables and the laws of quantum mechanics. http://phys.org/news206727404.html Physics Tue, 19 Oct 2010 17:17:00 EST news206727404 Institute for Nano Quantum Information Electronics, The University of Tokyo, Fujitsu, and NEC Corp. today announced that they have achieved quantum cryptographic key distribution at a world-record distance of 50 km using transmission from a single-photon emitter. http://phys.org/news203327745.html Physics Fri, 10 Sep 2010 09:02:43 EST news203327745 The Norwegian University of Science and Technology (NTNU) and the University of Erlangen-Nurnberg together with the Max Planck Institute for the Science of Light in Erlangen have recently developed and tested a technique exploiting imperfections in quantum cryptography systems to implement an attack. http://phys.org/news202139419.html Physics Sun, 29 Aug 2010 13:00:01 EST news202139419 An ultra-secure form of coded communication could be given a boost, thanks to scientists from the Universities of Glasgow, Strathclyde and Rochester. http://phys.org/news200315561.html Physics Fri, 06 Aug 2010 12:12:54 EST news200315561 (PhysOrg.com) -- A significant breakthrough spearheaded by University of Queensland, Canadian and Austrian researchers is featured in the latest issue of the journal Nature. http://phys.org/news199592950.html Physics Thu, 29 Jul 2010 03:30:51 EST news199592950 Quantum cryptography is the safest way to encrypt data. It utilizes the fact that transmitted information can only be measured with a strictly limited degree of precision. Scientists at Ludwig-Maximilians-University in Munich and ETH Zurich have now discovered how the use of a quantum memory affects this uncertainty. http://phys.org/news199443918.html Physics Tue, 27 Jul 2010 10:30:01 EST news199443918 At the very heart of applications such as quantum cryptography, computation and teleportation lies a fascinating phenomenon known as "entanglement". Two photons are entangled if the properties of one depend on those of the other, whatever the distance separating them. A new source of entangled photons twenty times brighter than all existing systems has been developed by a French team from the Laboratoire de Photonique et de Nano-structures (LPN) of CNRS. http://phys.org/news197900557.html Physics Fri, 09 Jul 2010 13:24:01 EST news197900557 (PhysOrg.com) -- One of the widely accepted properties of quantum entanglement is secrecy. Since scientists and researchers began working with quantum key distribution, entanglement has been considered an essential part of keeping communications private. What if entanglement didn't always mean secrecy, though? New work is shedding light on the nature of entanglement and quantum key distribution - and possibly proving that a high degree of entanglement does not necessarily lead to complete secrecy. http://phys.org/news197530666.html Physics Mon, 05 Jul 2010 08:30:01 EST news197530666 South African physicists working to protect data networks at the World Cup hope to provide something that no goalkeeper can promise: perfect defense. They're tapping the laws of physics to prevent hackers from monitoring videos, emails and phone calls relayed between Durban's Moses Mabhida Stadium and a nearby operations center for police, firefighters, and military personnel. http://phys.org/news196366336.html Technology Mon, 21 Jun 2010 19:12:31 EST news196366336 German hysicists at the Johannes Gutenberg University Mainz have developed a quantum interface which connects light particles and atoms. http://phys.org/news194169329.html Physics Thu, 27 May 2010 08:56:23 EST news194169329