Dance of the Photons: From Einstein to Quantum Teleportation

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9780374239664: Dance of the Photons: From Einstein to Quantum Teleportation

Einstein's steadfast refusal to accept certain aspects of quantum theory was rooted in his insistence that physics has to be about reality. Accordingly, he once derided as "spooky action at a distance" the notion that two elementary particles far removed from each other could nonetheless influence each other's properties―a hypothetical phenomenon his fellow theorist Erwin Schrödinger termed "quantum entanglement."

In a series of ingenious experiments conducted in various locations―from a dank sewage tunnel under the Danube River to the balmy air between a pair of mountain peaks in the Canary Islands―the author and his colleagues have demonstrated the reality of such entanglement using photons, or light quanta, created by laser beams. In principle the lessons learned may be applicable in other areas, including the eventual development of quantum computers.

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About the Author:

Anton Zeilinger is a professor of physics at the University of Vienna, where he heads the Institute for Quantum Optics and Quantum Information of the Austrian Academy of Sciences.

Excerpt. © Reprinted by permission. All rights reserved.:

DANCE OF THE PHOTONS
SPACE TRAVELWhen we hear of teleportation, we often think it would be an ideal means of traveling. We would simply disappear from wherever we happened to be and reappear immediately at our destination. The tantalizing part is that this would be the fastest possible way of traveling. Yet, a warning might be in order here: teleportation as a means of travel is still science fiction rather than science.Thus far, people have only been able to travel to the Moon, which on a cosmic scale is extremely close, the equivalent of our backyard. Within our solar system, the closest planets, Venus and Mars, are already roughly a thousand times more distant than the Moon, to say nothing of the planets farther out in the solar system.It is interesting to consider how long it would take to go to other stars. As we all remember from the Apollo program, which put the first men on the Moon, it takes about four days to go from Earth to the Moon. Traveling by spaceship from Earth to the planet Mars would take on the order of 260 days, one way. It is evident that our space travelers would get quite bored during that time, so they might make good use of their time by performing experiments involving quantum teleportation.In order to get even farther out, we might use the accelerating force of other planets or even of Earth itself, as has been done with some of the unmanned spacecraft exploring outer planets. The idea is simply to have the spaceship pass close by a planet so that, by means of a sort of slingshot action, it can be accelerated into a new orbit that carries it much farther outward. For example, using these methods, the spacecraft Pioneer 10 took about eleven years to travel past the outermost planets of the solar system on its probably unending journey into thespace between the stars. We can thus estimate that it will, for example, take Pioneer 10 about 100,000 years to get to Proxima Centauri, the closest star except for the Sun, at its current speed.Perhaps, therefore, it would be good to have some other way to get around, to cover large distances. What we want is to travel anywhere instantly, without any limitation on how far we can go. Is that possible, at least in principle? This is why science-fiction writers invented teleportation. Magically, you disappear from one place, and, magically, you reappear at another place, just an instant later.Copyright © 2010 by Anton Zeilinger

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