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Quantum Cloaking Makes Molecules Invisible

KentuckyFC writes "An international team of physicists has applied the ideas of cloaking to the quantum world and worked out how to hide quantum objects such as molecules. In the quantum world, seeing is equivalent to detecting a quantum object. In the case of molecules, that means looking for the terahertz radiation they produce when they vibrate (abstract). By designing a 'quantum corral,' an elliptical nanostructures that absorbs terahertz waves at a precise frequency, the team says it is possible to hide molecules that emit at exactly that frequency. They say their quantum corral would be ideally suited to detecting molecules of specific species while ignoring others. And that may mean a new generation of molecular detectors on the horizon.

Listening to hot quantum dots adds to nanotherapeutic toolbox

(Nanowerk Spotlight) Quantum dots are emerging as an important class of nanoparticles with applications ranging from medicine to energy. These nanocrystals possess size tunable optical and electronic properties resulting from quantum confinement which allow them to be suitable candidates for applications in solar cells and light emitting devices. For instance, quantum dots have been identified as important light harvesting material for building highly efficient solar cells – when exposed to light at certain wavelengths they can generate free electrons and create an electrical current (see: Catching a rainbow - quantum dot nanotechnology brightens the prospects for solar energy). Having a high resistance to photobleaching, quantum dots (QDs) also are attractive materials for optoelectronics and in vivo biosensing (see: Live cell imaging

Storing Qubits In Nuclei

bednarz writes "Scientists have demonstrated what is being called the 'ultimate miniaturization of computer memory,' storing data for nearly two seconds in the nucleus of an atom of phosphorus. The hybrid quantum memory technique is a key step in the development of quantum computers, according to the National Science Foundation. An international team of scientists demonstrated that quantum information stored in a nucleus has a lifetime of about 1¾ seconds. 'This is significant because before this technique was developed, the longest researchers could preserve quantum information in silicon was a few tens of milliseconds. Other researchers studying quantum computing recently calculated that if a quantum system could store information for at least one second, error correction techniques could then protect that data for an indefinite period

'Quantum of Solace' game review

'Quantum of Solace' game photos "Quantum of Solace" 'Quantum of Solace' game photos 'Quantum of Solace' game photos

NSA and Army On Quest For Quantum Physics Jackpot

coondoggie sends this excerpt from NetworkWorld: "The US Army Research Office and the National Security Agency (NSA) are together looking for some answers to their quantum physics questions. ... The Army said quantum algorithms that are developed should focus on constructive solutions [PDF] for specific tasks, and on general methodologies for expressing and analyzing algorithms tailored to specific problems — though they didn't say what those specific tasks were ... 'Investigators should presuppose the existence of a fully functional quantum computer and consider what algorithmic tasks are particularly well suited to such a machine. A necessary component of this research will be to compare the efficiency of the quantum algorithm to the best existing classical algorithm for the same problem.

Nanotechnology: Quantum Computer May Be Closer With Extended Quantum Lifetime of Electrons

Physicists in the USA and at the London Centre for Nanotechnology have found a way to extend the quantum lifetime of electrons by more than 5,000 per cent, as reported recently in Physical Review Letters. Electrons exhibit a property called ‘spin’ and work like tiny magnets which can point up, down or a quantum superposition of both.

Solterra to Compete in $700 Million Quantum Dot Market: To Supply Cheaper, More Efficient Quantum Dots to Rapidly Growing Sector

Hague Corp. ("Hague") (OTCBB: HGUE), a solar technology and quantum dot manufacturing company, today commented on recently released forecast for the Quantum Dot ("Solterra") market where it competes.

Quantum Test Found For Mathematical Undecidability

KentuckyFC writes "Philosophers have long wondered at the profound link between mathematics and physics, but how deep does this connection go? Pretty deep according to the results of a quantum experiment exploring the nature of mathematical undecidability. Here's how: any logical system must be based on axioms, which are propositions that are defined to be true. A proposition is logically independent from these axioms if it can neither be proved nor disproved from them; mathematicians say it is undecidable. In the experiment, researchers encoded a set of axioms as quantum states. A particular measurement on this system can then be thought of as a proposition which, if undecidable, yields a random result — which is what they found. 'This sheds new light on the (mathematical) origin of quantum randomness in these measurements,' say the re

Is entanglement always good for quantum computers?

The entanglement of quantum bits (or qubits) is what should allow quantum computers to perform certain calculations much faster than the computers we use today. But now, physicists in Germany and Canada are saying that most qubits could be “too entangled” to be of any use in quantum computers.

MI6 CONFIRMS ACTIVISION'S 007 STATUS QUANTUM OF SOLACE VIDEO GAME MAKES RETAIL DEBUT

London, UK– October 31, 2008– Can’t wait for the new movie to step into the shoes of James Bond? Activision Publishing, Inc. (Nasdaq: ATVI) today announced that the Quantum of Solace™ video game, based on the eagerly anticipated“Quantum of Solace” and prior“Casino Royale” James Bond films, is dashing into European retail outlets today, and will be available in North American stores on November 4, 2008. Developed under license from EON Productions Ltd and Metro-Goldwyn-Mayer Studios Inc. (MGM), the Quantum of Solace video game equips players with the weapons, espionage and hand-to-hand combat skills and overall charm needed to survive the covert lifestyle of legendary 007 secret agent James Bond.

Q&A With Post-Quantum Computing Cryptography Researcher Jintai Ding

Quantum computers may be the perennial “computer of the future,” but if (or when) they do become a reality, their sheer power could threaten the security of our information-technology infrastructure. Online shopping, e-mail, and automatic software updates rely on public-key cryptography methods to ensure those transactions are safe. The two main methods of public-key cryptography are RSA, which is based on an algorithm that relies on the difficulty of factoring large numbers, and elliptic-curve cryptography (ECC), which is based on the mathematical structure of elliptical curves. But a quantum computer could quickly crack either cryptosystem. In October, the University of Cincinnati hosted an international cryptography conference with industry and government experts to address this very problem.

Quantum calibration paves way for super-secure communication

(PhysOrg.com) -- A new approach to calibrating quantum mechanical measurement has been developed with particular applications in optics and super-secure quantum communication.

Quantum computing R&D delivers a more practical logic gate

Computers based on the powerful properties of quantum mechanics have the potential to revolutionize information technology and security, but for decades they have remained more theoretical than practical, and difficult to scale up. That is changing, however, as demonstrated in a recent report in the journal Science. In the paper, engineers and physicists from Stanford Univ. and the Univ. of California-Santa Barbara demonstrate a potential progenitor of an essential component of quantum computers, "a logic gate" that enables interaction between just two particles of light.

ETSI works on quantum cryptography for communication security

The standards organization’s Quantum Key Distribution (QKD) initiative is now materialized by an Industry Specification Group. This group of industrial players, both ETSI members and non-members, will build specifications allowing to transfer quantum cryptography out of the controlled and trusted environment of experimental laboratories into the real world. “

Aristotle May Provide the Key to Quantum Gravity

So far in these posts we have looked at testable quantum gravity effects, but I have not said much about the ultimate theory of quantum gravity itself. There is a simple reason: I do not think we have a compelling theory yet.

A Toolkit for Silicon-Based Quantum Computing

"Bit" is a contraction of "binary digit," but unlike a classical bit, which is plain-vanilla binary with a value of either 0 or 1, a quantum bit, or qubit -- the theoretical basis of quantum computing -- holds both 0 and 1 in a superposed state until it is measured.

MI6 Confirms Activision's 007 Status - Quantum of Solace(TM) Video Game Makes Retail Debut

PRNewswire-FirstCall/ -- Can't wait for the new movie to step into the shoes of James Bond? Activision Publishing, Inc. (ATVI) today announced that the Quantum of Solace(TM) video game, based on the eagerly anticipated "Quantum of Solace" and prior "Casino Royale" James Bond films, is dashing into European retail outlets today, and will be available in North American stores on

Memoirs of a qubit: Hybrid memory solves key problem for quantum computing

An international team of scientists has performed the ultimate miniaturisation of computer memory: storing information inside the nucleus of an atom. This breakthrough is a key step in bringing to life a quantum computer - a device based on the fundamental theory of quantum mechanics which could crack problems unsolvable by current technology.

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