Improving quantum dot synthesis: related news

Improving quantum dot synthesis

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Improving Quantum Dot Synthesis

Materials researchers at the National Institute of Standards and Technology have developed a simplified, low-cost process for producing high-quality, water-soluble quantum dots for biomedical applications. By using a laboratory microwave reactor to promote the synthesis of the widely used nanomaterials, the recently published NIST process avoids a problematic step in the conventional approach to making quantum dots, resulting in brighter, more stable dots.

How To Build a Quantum Eavesdropper

KentuckyFC writes "Quantum encryption is perfectly secure, in theory. In practice, however, there are loopholes. Now Japanese scientists have designed a quantum eavesdropper that exploits one of these loopholes to listen in to quantum conversations. QC's security arises from the impossibility of making a perfect copy of a quantum object without destroying it — so the sender and receiver can always tell if they've been overheard. But it turns out that an eavesdropper can make imperfect copies and use them to extract information from a quantum message without alerting sender or receiver (abstract). The Japanese design does just this. That should worry banks and government agencies that have begun to use some of the commercial quantum encryption systems now available.

Light Touch: Controlling the Behavior of Quantum Dots

(Top) Cross-section scanning tunneling microscope (STM) image shows indium arsenide quantum dot regions embedded in gallium arsenide. Each 'dot' is approximately 30 nanometers long–faint lines are individual rows of atoms. (Color added for clarity.) Credit: J.R. Tucker (Bottom) Schematic of NIST-JQI experimental set up. Orienting the resonant laser at a right angle to the quantum dot light minimizes scattering. Credit: Solomon/NIST

Theorists Make Quantum Communications Breakthrough

KentuckyFC writes "One of the cornerstones of modern physics is Claude Shannon's theory of communication, which he published in 1948. If you've ever made a phone call, watched TV, or used a computer, you've got Shannon to thank for describing how information can be moved from one place in the universe to another using an idea called the channel capacity. But nobody has been able to develop a quantum version of this theory. So physicists have no idea how much quantum information can be sent from one point to another. Now two American physicists have made an important breakthrough by proving that two quantum channels with zero capacity can carry information when used together. That's interesting because it indicates that physicists may have been barking up the wrong tree with this problem: it implies that the quantum capacity of a channel d

Nanowire quantum dot counts electrons

Scientists in Switzerland have succeeded in measuring current by counting single electrons tunnelling through an indium arsenide nanowire quantum dot. The results obtained compare well to current measurements made using conventional techniques; so opening the way for single-charge detection to define a new metrology standard for electric current.

Innolume Secures EUR8.6 Million New Funding to Ramp up Production and Enhance Market Penetration of Quantum Dot Lasers

Innolume Secures EUR8.6 Million New Funding to Ramp up Production and Enhance Market Penetration of Quantum Dot Lasers

Quantum "Uncollapse" Muddies Definition Of Reality

Quantum theory says that quantum particles have wave-like properties and can exist in many places at once. Why the objects we see around us every day — in what physicists call the classical world — don't behave this way despite being made of these very same quantum particles is a deep and fundamental question in modern physics.

Innolume Secures 8.6 Million New Funding to Ramp up Production and Enhance Market Penetration of Quantum Dot Lasers

Home > Press > Innolume Secures €8.6 Million New Funding to Ramp up Production and Enhance Market Penetration of Quantum Dot Lasers

Dot-pro Domain Landrush Starts July 21, 2008

EnCirca (http://www.encirca.pro) will begin its special promotion for dot-pro domain names to celebrate the re-launch of the dot-pro domain. Licensed professionals from anywhere in the world will be eligible to apply for dot-pro domain names such as trademark.pro on a first-come, first-served basis.

Quantum Computing Breakthrough Arises From Unknown Molecule

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. In a Nature Physics journal paper currently online, the researchers describe how they have created a new, hybrid molecule in which its quantum state can be intentionally manipulated--a required step in the building of quantum computers. Full story

How Quantum Physics Could Power the Future

A theoretical model of a quantum dot made out of the semiconductor material gallium arsenide. The dot contains just 465 atoms. Credit: Lin-Wang Wang/Lawrence Berkeley Laboratory

Quantum of Solace Details from Leipzig

James Bond is back to settle the score in the Quantum of Solace videogame. Introducing a more lethal and cunningly efficient Bond, the game blends intense First-Person action with a unique third-person Cover-Combat System that allows players to truly feel what it is like to be the ultimate secret agent as they use their stealth, precision shooting and lethal combat skills to progress through Missions. Seamlessly blending the heart-pounding action and excitement of the upcoming Quantum of Solace feature film with the Casino Royale movie, the title propels players into the cinematic experience of international espionage. Based on the renowned Call of Duty 4: Modern Warfare Engine that has been specifically engineered to immerse players in the Bond universe, the Quantum of Solace videogame delivers superior High-Definition graphics, reactive

Gene Silencer and Quantum Dots Reduce Protein Production to a Whisper

Fluorescent nanoparticles, called quantum dots, are dramatically better than existing methods for delivering a gene-silencing tool into cells. The quantum-dot chaperones help impede the cell's production of a given protein.

Study shows quantum dots can penetrate skin through minor abrasions

Researchers at North Carolina State University have found that quantum dot nanoparticles can penetrate the skin if there is an abrasion, providing insight into potential workplace concerns for healthcare workers or individuals involved in the manufacturing of quantum dots or doing research on potential biomedical applications of the tiny nanoparticles.

Beating the codebreakers with quantum cryptography

28 April 2008 Quantum cryptography may be essentially solved, but getting the funky physics to work on disciplined computer networks is a whole new headache. Cryptography is an arms race, but the finish line may be fast approaching. Up to now, each time the codemakers made a better mousetrap, codebreakers breed a better mouse. But quantum cryptography theoretically could outpace the codebreakers and win the race. Forever. Already the current state of the art in classical encryption, 128-bit RSA, can be cracked with enough raw, brute force computing power available to organisations like the US National Security Agency. And the advent of quantum computing will make it even simpler. The gold standard for secret communication will be truly dead.

Physicists Produce Quantum-Entangled Images

Using a convenient and flexible method for creating twin light beams, researchers at the Joint Quantum Institute (JQI) of the Commerce Department’s National Institute of Standards and Technology (NIST) and the University of Maryland have produced “quantum images,” pairs of information-rich visual patterns whose features are “entangled,” or inextricably linked by the laws of quantum physics.

Physicists tweak quantum force, reducing barrier to tiny devices

A scanning electron micrograph, taken with an electron microscope, shows the comb-like structure of a metal plate at the center of newly published University of Florida research on quantum physics. UF physicists found that corrugating the plate reduced the Casimir force, a quantum force that draws together very close objects. The discovery could prove useful as tiny “microelectromechanical” systems -- so-called MEMS devices that are already used in a wide array of consumer products -- become so small they are affected by quantum forces. Yiliang Bao and Jie Zoue/University of Florida

Microwave Synthesis Connects With the (Quantum) Dots

Brightly glowing vials of highly luminescent, water soluble quantum dots produced by the new NIST microwave process span a wavelength range from 500 to 600 nm. Credit: NIST

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