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Quantum

The research took place at the German Aerospace Center (Photo: DLR)

For the first time, quantum cryptographers have successfully transmitted a quantum key from a fast-moving object – a Dornier 228 turboprop. The experiment involved sending a secure message from the aircraft to a ground station via laser beam, and can be considered a significant step toward the creation of a network of “unbreakable” satellite data transmissions.  Read More

The speed of entanglement dynamics is at least 10,000 times faster than light according to...

Quantum entanglement, one of the odder aspects of quantum theory, links the properties of particles even when they are separated by large distances. When a property of one of a pair of entangled particles is measured, the other "immediately" settles down into a state compatible with that measurement. So how fast is "immediately"? According to research by Prof. Juan Yin and colleagues at the University of Science and Technology of China in Shanghai, the lower limit to the speed associated with entanglement dynamics – or "spooky action at a distance" – is at least 10,000 times faster than light.  Read More

Israeli military radar (Photo: Bukvoed via Wikimedia commons)

The military use of radar has always had a yin-yang dynamic – as new forms of radar are developed, so too are new ways to jam them. A team of physicists at the University of Rochester has discovered how to defeat the latest active radar jamming methods by taking advantage of the quantum properties of photons. While this new anti-jamming technology cannot remove the false information, it provides an immediate alert that false information is being received.  Read More

Amplifying information – the key to the quantum Internet?

The establishment of a worldwide quantum internet would provide individuals, businesses, organizations, and governments access to intrinsically secure communications. However, absorption of photons in transit between internet nodes can dramatically reduce the efficiency of such a quantum internet. Now a research group at Australia's (CQCCT) has invented a way to recover some of the lost quantum information by teleporting the original information to another photon.  Read More

Professor Zenghu Chang with his ultrashort laser pulse apparatus

Since first invented, the effort to make lasers that can produce shorter and more powerful pulses of light has been a very active one. One driving force is that if you want to take a picture of something occurring very rapidly, you need a very short pulse of light to prevent the image from blurring. The first ruby laser produced microsecond pulses of light, but more recently femtosecond optical pulses a billion times shorter have become common. Still shorter pulses belong to the attosecond regime - the regime wherein a University of Central Florida research team is creating optical pulses sufficiently brief to stop quantum mechanics in its tracks.  Read More

A recent study of gamma-ray bursts (that originate from the collapse of a massive star) fi...

A recent study of gamma-ray bursts by Professor Robert Nemiroff and his colleagues at Michigan Technological University provides the first strong evidence concerning the small-scale smoothness of spacetime. Oddly, this examination of the very small is accomplished by measuring a handful of gamma-rays after they traveled over ten billion light years.  Read More

Koji Usami holding the semiconductor nanomembrane inside its holder

Researchers at the Niels Bohr Institute have succeeded in using a new form of laser cooling method to cool a two and a half square millimeter semiconducting gallium arsenide (GaAs) membrane with a thickness of 160 nm from room temperature to four degrees above absolute zero - the temperature of liquid helium.  Read More

Extra electrons harvested from a photon's quantum 'shadow state' could boost the efficienc...

Researchers at the University of Texas say it is possible to hike the energy yield of solar cells by exploiting what they call a photon's "shadow state", doubling the number of electrons that may be harvested in the process. They claim the discovery could up the theoretical maximum efficiency of silicon solar cells from 31 to 44 percent.  Read More

Virtual photons bounce off a 'mirror' that vibrates at almost the speed of light. The roun...

A perfect vacuum is impossible to achieve, at least in theory. As anyone with any interest in quantum physics would know, the vacuum is full of various particles that fluctuate in and out of existence. These "virtual" particles have been the focus of scientist, Christopher Wilson. Working with his team at Sweden's Chalmers University of Technology, Wilson has succeeded in producing real photons from these virtual photons. Which, in layman's terms, means that they have created measurable light ... from nothing.  Read More

Recent demonstration of quantum levitation during the 2011 Association of Science- Technol...

Maglev trains have been in development since before Luke Skywalker drove his first Land Speeder but, like personal rocket packs, the idea of levitating transport is taking a while to catch on. While this "quantum levitation" demonstration shown by the superconductivity group at Tel Aviv University at the 2011 ASTC annual conference in Baltimore doesn't mean we'll all be floating to work anytime soon, it does remind us of the amazing potential of this kind of technology.  Read More

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