Moving - This Post - External Link

Hello All,

We have shifted this blog to http://itsurf.blogspot.com

No more posting will be done here. For new posts visit http://itsurf.blogspot.com
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Regards,
Mathew.

Teleportation Gets a Boost - This Post - External Link

Until now scientists have teleported similar objects such as light or single atoms over short distances from one spot to another in a split second.

But Professor Eugene Polzik and his team at the Niels Bohr Institute at Copenhagen University in Denmark have made a breakthrough by using both light and matter.

"It is one step further because for the first time it involves teleportation between light and matter, two different objects. One is the carrier of information and the other one is the storage medium," Polzik explained in an interview on Wednesday.

The experiment involved for the first time a macroscopic atomic object containing thousands of billions of atoms. They also teleported the information a distance of half a meter but believe it can be extended further.

"Teleportation between two single atoms had been done two years ago by two teams but this was done at a distance of a fraction of a millimeter," Polzik, of the Danish National Research Foundation Center for Quantum Optics, explained.

"Our method allows teleportation to be taken over longer distances because it involves light as the carrier of entanglement," he added.

Quantum entanglement involves entwining two or more particles without physical contact.

Although teleportation is associated with the science-fiction series Star Trek, no one is likely to be beamed anywhere soon.

But the achievement of Polzik's team, in collaboration with the theorist Ignacio Cirac of the Max Planck Institute for Quantum Optics in Garching, Germany, marks an advancement in the field of quantum information and computers, which could transmit and process information in a way that was impossible before.

"It is really about teleporting information from one site to another site. Quantum information is different from classical information in the sense that it cannot be measured. It has much higher information capacity and it cannot be eavesdropped on. The transmission of quantum information can be made unconditionally secure," said Polzik whose research is reported in the journal Nature.

Quantum computing requires manipulation of information contained in the quantum states, which include physical properties such as energy, motion and magnetic field, of the atoms.

"Creating entanglement is a very important step but there are two more steps at least to perform teleportation. We have succeeded in making all three steps -- that is entanglement, quantum measurement and quantum feedback," he added.

Making Computer Memory From a Virus - This Post - External Link

Giving your digital camera a virus may not sound very smart, but a memory chip that incorporates millions of viruses may just be the fastest thing around.

By coating 30-nanometre-long chunks of tobacco mosaic virus with platinum nanoparticles, it’s possible to create a transistor with very fast switching speed. Millions of these transistors could eventually be used in a memory chip to replace flash memory in mp3 players and digital cameras, for example.

A camera fitted with a virus chip would take a few microseconds to display an image, compared with the milliseconds taken by existing devices, says Yang Yang of the University of California, Los Angeles, whose team is working on the virus chip.

The team built a transistor by embedding the coated virus strips in a polymer matrix, sandwiched between two electrodes much like a standard transistor. Apply a voltage to the transistor, and the platinum nanoparticles – roughly 16 per virus – each donate an electron to proteins on the surface of the virus, moving the device to an ON state.

When the voltage dips below a certain threshold, the electrons jump back to the nanoparticle, switching the transistor to an OFF state (Nature Nanotechnology, DOI:10.1038/nnano.2006.55).

This process takes just 100 microseconds because the charge only has to travel 10 nanometres between each nanoparticle and the surface of the virus. In flash memory chips, a capacitor is used as a control gate, building up charge to a certain level before current is able to flow to a second gate.

The device is still some way from practical use in a memory chip. “Now we need to figure out how to wire up the viruses,” says Yang. They hope to build a prototype packed with millions of single-virus transistors within four years.

Pi Recited to 100,000 Digits - This Post - External Link

A Japanese mental health counselor recited pi to 100,000 decimal places from memory on Wednesday, setting what he claims to be a new world record.

Akira Haraguchi, 60, needed more than 16 hours to recite the number to 100,000 decimal places, breaking his personal best of 83,431 digits set in 1995, his office said Wednesday. He made the attempt at a public hall in Kisarazu, just east of Tokyo.

Pi is a physical constant defined as the ratio of a circle's circumference to its diameter.

It is usually written out to a maximum of three decimal places, as 3.141, in math textbooks. But the number, which has fascinated scientists for centuries, has no theoretical limit to the number of decimal places it can be written to. It is a constant that appears in the proofs of many equations defining the universe.

"What I am aiming at is not just memorizing figures, I am thrilled by seeking a story in pi," Haraguchi said.

The Guinness Book of Records currently lists Hiroyuki Goto, also from Japan, as the official record holder for reciting pi from memory. He recited the ratio out to 42,195 decimal places in 1995.

Guinness never entered Haraguchi's 1995 feat in its record book. The editors of the book could not be immediately reached for comment regarding Haraguchi's latest attempt.

Haraguchi, a psychiatric counselor and business consultant in nearby Mobara city, took a break of about 5 minutes every one to two hours, going to the rest room and eating rice balls during the attempt, said Naoki Fujii, spokesman of Haraguchi's office.

Fujii said all of Haraguchi's activities during the attempt, including his bathroom breaks, were videotaped for evidence that will later be sent for verification by the Guinness Book of Records.

Two local education officials joined 29 conference hall staff who worked in rotation to monitor Haraguchi.

Haraguchi, who began reciting pi at 9 a.m. Tuesday, reached his previous record of 83,431 digits Tuesday night, finishing exactly at 100,000 digits at 1:28 a.m. Wednesday, Fujii said.

In 2002, University of Tokyo mathematicians, aided by a supercomputer, set the world record for figuring out pi to 1.24 trillion decimal places.

Power Suit Promises Super-Human Strength - This Post - External Link

Engineers in Japan are perfecting a wearable power suit that amplifies human strength to help lift hospital patients or heavy objects.

Driven by portable batteries, micro air pumps and small body sensors that pick up even the slightest muscle twitch, the Stand-Alone Wearable Power Assist Suit is designed to help nursing home workers lift patients of up to 180 pounds while cutting the amount of strength required in half, project researcher Hirokazu Noborisaka told LiveScience today.

At Wired Magazine's NextFest new-technology forum here, researchers demonstrated walking [Image] and lifting weights [image] in the 66-pound suit, which was developed at the High-Tech Research Center of Japan's Kanagawa Institute of Technology.

"When I wear it, I don't feel that it's heavy at all," said project team member Hiroe Tsukui after stepping out of the power suit. "The sensors can tell the muscle power needed to lift an object."

A network of sensors track the wearer's upper arms and legs and waist-muscle activity, then relay the data to an onboard microcomputer that regulates air flow into a series of inflatable cuffs which expand to amplify lifting strength. The suit supports its own weight and carries a battery lifetime of about 30 minutes.

"We think that 30 minutes is enough time to lift a patient from one place to another," said Noborisaka, who engineered the sensor computing system used in the suit, adding that future versions could help the elderly or disabled walk.

The current model—known as the 2nd Stand-Alone Power Assist Suit—is stronger and more compact than its predecessor, researchers said.

Designer Mineo Ishii said that the next step is to further reduce the size of the power assist suit to make it more practical for use by hospital staff.

"It needs to be more flexible so for more easy movement," Ishii said, adding that a protective cover that shrouds the suit's sensitive or sharp areas, is also required.