5 posts categorized "Quantum Computing"

12/26/2012

2012: Science Fiction Dreams That Came True

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As a longtime reader of science fiction, it's always interesting to see how the visions of writers eventually become real. Take Arthur C. Clarke's letter to Wireless World in 1945, which details the geostationary communications satellite network everyone uses today. The satellites are in what is called the "Clarke Orbit." And Isaac Asimov wrote frequently about humanoid robots, which are becoming more common in research labs -- although we have yet to see R. Daneel Olivaw from Asimov's Robot series.

So inspired by these writers and others, I decided to take a look at 2012 and the futuristic technologies that are materializing before our eyes.

ANALYSIS: Robot Prostitutes, the Future of Sex Tourism

Bionic Limbs
The term "cyborg" was coined in 1960 by Manfred E. Clynes and Nathan S. Kline, in an article they wrote for the journal Astronautics. Since then bionic limbs have been a trope in many pieces of fiction -– The Six Million Dollar Man of the 1970s, the Borg of the Star Trek franchise, and even Darth Vader. In 2012 for the first time, a paralyzed woman was able to control a robotic limb and feed herself directly with her brain. Continuing work with primates demonstrated that it's possible to make the brain-computer interface efficient enough to design more realistic movement into the limbs. The bionic limbs so far don't look anything like their fictional counterparts, as they are still connected via external electrodes to the skull. But that dream seems to be a lot closer than it was even a decade ago.

Quantum Teleportation and Communication
While it's not possible -- yet -- to "beam" an object around as in Star Trek, new records for zapping photons instantly from one place to another were set this year. Quantum teleportation has been done in the lab for some time, but the distances were on the order of a few yards. In 2012 the new record was 89 miles. In addition to teleporting, scientists built the first quantum Internet. It's only a beginning, but teleporting photons for miles would enable communications that can't be hacked or eavesdropped.

Genetic Disease Prevented
Genetic engineering for "better" humans is a theme that's appeared repeatedly ever since Aldous Huxley's Brave New World in 1931 -- although at that point nobody knew what DNA really was. Later, films such as Gattaca and novels such as Beggars in Spain explore the implications of widely available genetic alterations. In 2012, we saw a proof-of-concept for mitochondrial diseases. About one in 200 people are born with a disorder of the mitochondria, the energy factories of cells. For the first time scientists were able to transfer the nuclear DNA of one human egg cell to another. Two groups independently found a way to transplant nuclei between human egg cells, leaving behind the mitochondrial DNA, which is passed from mother to child. The finding means that mitochondrial disorders could be cured before a child is born. Such techniques won't cure something like Down's syndrome, which involves nuclear DNA. But it shows that some manipulation of the human genome is not only possible, but happening. 

ANALYSIS: Ray Bradbury's Visions

The Universal Translator
Most of the time when intrepid explorers in fiction meet aliens, they always seem to speak perfect English. Doctor Who's TARDIS generates a field that allows travelers to be understood, while the crew of the Enterprise never seem to need a dictionary. Kim Stanley Robonson's Mars Trilogy features one, but he didn't think it would appear until late in the 21st century (the novels were written in the 1990s). While they won't let you talk to aliens, in the last year several speech-to-speech translators have managed to reach real consumer devices -- and even one type that uses your own voice. Most of the apps require an internet connection, though some, such as Jibbigo, can store their dictionaries locally. (If they ever add Klingon I'm taking it to the next ComicCon).

Head-mounted Computer Glasses
Readers of Charles Stross' novel Accelerando would have eagerly anticipated Google Glasses -- the Internet giant's foray into augmented reality. In the novel, "venture altruist" Manfred Macx carries his data and his memories in a pair of glasses connected to the Internet. Google Glasses allow the wearer to access data, the Internet and capture life via a head-mounted digital camera. Memories will have to wait.

Private Space Flight
In many science fiction stories, space travel is private. In Ridley's Scott latest movie, Prometheus, the Weyland Corporation funds an expedition to follow a star map to the distant moon LV-223. In real life, Elon Musk's SpaceX launched the first of a dozen planned missions to the International Space Station. The Dragon capsule is designed to resupply the ISS, but Musk, who made his fortune as founder of PayPal, has bigger plans: a colony on Mars. Is 2013 going to be the year human spaceflight becomes an enterprise like railroads? We won't know that for a while, but SpaceX is a heck of a start.

This list isn't comprehensive, and it isn't meant to be the last word on anything; readers, if you think there's something I missed, please sound off in the comments!

Credit: Colin Anderson/Blend Images/Corbis




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11/08/2012

Quantum Limit of Gadgets Found? DNews Nugget

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Quantum Jitters: Yesterday, I visited my local Apple store to fix an iPhone glitch. It turns out that hanging around for too long in Apple stores is a very bad idea -- I was a heartbeat away from handing over my credit card to buy a shiny new iMac. As I played with the touchpad on one of Apple's beautiful machines, swiping through screens like Tom Cruise in Minority Report, I started to ponder: How will it all end? After all, miniaturization can only go so far, but what's the limit? Well, it turns out that researchers might have found it.

Moore's Law dictates that every 18 months, the density of transistors on integrated circuits should double. This is a basic tenet of technology and is the driving miniaturization factor that gives us computers that can fit in our pockets. However, according to researchers at McGill University and General Motors who carried out tests on a microscopic tungsten probe and gold surface interface, when they applied electricity across the interface, the current dropped off far quicker than they predicted. Basically, they had probed the quantum limit of the flow of electrons through the material.

Quantum

"You could use the analogy of a water hose," said Peter Grütter, a physics professor at McGill University. "If you keep the water pressure constant, less water comes out as you reduce the diameter of the hose. But if you were to shrink the hose to the size of a straw just two or three atoms in diameter, the outflow would no longer decline at a rate proportional to the hose cross-sectional area; it would vary in a quantized ('jumpy') way."

So if you make your components too thin, rather than having a flow of current, you will eventually see quantum effects that could make gadgets problematic to design. via Futurity.com

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07/26/2012

Quantum Computing Closer with Lasers

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In the future, computers will be faster than the fastest supercomputers of today, they'll be able crack any code, analyze gobs of data and know immediately if they're being infiltrated by hackers. The computers able to do that will be based on quantum physics, a mysterious and paradoxical area of physics that scientists are still trying to figure out. It requires, at its foundation, the ability to control a single photon.

But now, an international team of physicists and computer scientists from the Massachusetts Institute of Technology and led by Thibault Peyronel has built a device that turns a laser beam into a stream of single photons that can be turned on and off. That capability could lead to a quantum transistor. Transistors in conventional computers are turned on and off by electrical current.

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"What you have is individual photons controlling the switch," Thad Walker, professor of physics at the University of Wisconsin, told Discovery News. Walker was not connected with the research.

To get single photons, Peyronel and the team used two laser beams. The first one they at a cloud of rubidium atoms that were chilled to a temperature that was just hair above absolute zero. Next, the fired a second laser beam, called a control beam.

Ordinarily, rubidium atoms are opaque. But after being hit with the second laser beam, they became transparent. In that state, photons were able to pass through the atoms, albeit slowly.

The photon didn't just slow down, either. Because the the rubidium atoms were in such an excited state, only one photon at a time was able to pass through the atom. When another photon entered the cloud of atoms, the rubidium becames opaque and the photon was unable to pass through.

Turning off the control beam also rendered the rubidium atom opaque, blocking any photons from passing through. That means the apparatus is an optically controlled switch, one that works on single photons.

The effect also implies that one could build a kind of quantum transistor. A rubidium chamber emitting single photons could be placed next to another just like it. The single photons would go to the second chamber. The first ones to get there could be let through while later ones would be stopped. Turn off the first chamber for a moment and the second one "opens" again.

That is essentially how transistors in conventional computers work, only those are controlled by electric current.

BLOG: A Baby Quantum Internet Was Born Today

The ability to send single photons also means it's possible to build a true quantum communications system. Quantum communications can't be eavesdropped upon, because doing so alters the state of the bits being transmitted. That's a dead giveaway to the person receiving the transmission.

This isn't the only group that managed to control single photons. At Georgia Tech, Alex Kuzmich and Yaroslav Dudin used a similar technique to produce single-photon emissions.

Walker noted these experiments also open the way to a lot of fundamental physics research. Ordinarily when a quantum state is measured, the photon is destroyed. The ability to control the transmission of one photon at a time also means one can measure the quantum state of the incoming photon without actually "touching" it.

The MIT research appeared in the journal Nature on July 25.

Image: MIT / Ofer Firstenberg and Yoav Sterman.




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06/01/2012

Movie Frames Saved to Atomic Vapor

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Remember when you could barely fit a few digital photos on a USB storage stick? In the future we won't even need solid objects to carry around our files. We'll use vapor. This new method for storing images could represent an important leap for quantum computing and communications.

ANALYSIS: A Baby Quantum Internet Was Born Today

Physicists at the Joint Quantum Institute, which is jointly run by the National Institute of Standards and Technology and the University of Maryland, successfully stored and replayed frames from a short movie in room temperature atomic gas for the first time. Details of their demonstration were just published in the journal Optics Express (abstract).

We already use light signals to store information -- think about the holographic technology embedded in CDs. A group at the institute led by adjunct physics professor Paul Lett and atomic physics postdoc Quentin Glorieux just took that light signal storage to the next level.

To achieve the storage and retrieval, they used a setup called a "gradient echo memory." Basically the physicists encoded two movie frames -- each showing the letters "N" and "T" -- in photons. As Adi Robertson from The Verge helpfully explained, those photons were sent into a tiny cell filled with a cloud of room temperature gas called rubidium. When a magnetic field was switched on, the images were absorbed. When it was switched off, the information was emitted.

The physicists played back the two movie frames successfully multiple times, although they reported that only about 8 percent of the original light was redeemed. Captures from a high-speed camera recording published in their journal article show the increasing distortion. Fortunately, they expect that rate to improve with more practice.

In related news, some dude made a folksy song about the journal article and recently performed it in a YouTube video. Despite a rather clunky start, the tune gets kind of catchy at the end.

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With atomic vapor storage, a quantum Internet is just around the corner. As one commenter responding to an article on The Verge about the research aptly put it: "Cloud storage. Literally."

Photo: A movie frame that was stored in atomic vapor and later retrieved. Credit: NIST.



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04/12/2012

A Baby Quantum Internet Was Born Today

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Years from now it may be said that the quantum Internet was born today. When the baby system matures, it will be able to process unfathomable amounts of data and never be hacked.

The system only has two nodes, but the Internet's birth started in a similar way back in the late 1960s. The developers -- physicists led by Stephan Ritter and Gerhard Rempe of the Max Planck Institute of Quantum Optics in Germany -- published their work in this week's issue of the journal "Nature."

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The quantum network was built using two atoms of rubidium that exchange photons, or particles of light. Each atom is placed inside a cavity with highly reflecting mirrors on each side, and at a very short distance from each other. The two so-called optical cavities are connected by an optical fiber.

Scientists aim a laser at the first atom, causing the atom to emit a single photon. That photon zooms along the optical fiber to other optical cavity containing the other atom. That's where the mirrors come in -- ordinarily it's difficult to get an atom and a photon to interact reliably. But by bouncing the photon off the mirrors in the cavity thousands of times, it's more likley to hit the atom and be absorbed by it. That absorbtion is what transmits the information about the first atom's quantum state to the second atom.

BLOG: Quantum Entanglement To Aid Gravitational Wave Hunt

Besides sending information, the two atoms were entangled, meaning that the atoms were linked. If the first node is in quantum state A, for example, the second node will also be in quantum state A. In this experiment, the atoms were entangled for 100 microseconds -- a long time in quantum physics.

This entanglement is what makes hacking into a quantum computer and eavesdropping on impossible. As as soon as a hacker tapped into a quantum network, the states of the atoms wouldn't match up -- a big red flag that something was awary.

It's a long way yet to a truly large-scale quantum network, but this is a first step.

via Max Planck Institute for Quantum Optics

Image: Andreas Neuzner, Max Planck Institute for Quantum Optics



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