The Reality Tests

[seemslikeadream]

http://www.seedmagazine.com/news/2008/06/the_reality_tests_1.php

A team of physicists in Vienna has devised experiments that may answer one of the enduring riddles of science: Do we create the world just by looking at it?

by Joshua Roebke • Posted June 4, 2008 11:10 AM


To enter the somewhat formidable Neo-Renaissance building at Boltzmanngasse 3 in Vienna, you must pass through a small door sawed from the original cathedrallike entrance. When I first visited this past March, it was chilly and overcast in the late afternoon. Atop several tall stories of scaffolding there were two men who would hardly have been visible from the street were it not for their sunrise-orange jumpsuits. As I was about to pass through the nested entrance, I heard a sudden rush of wind and felt a mist of winter drizzle. I glanced up. The veiled workers were power-washing away the building's façade, down to the century-old brick underneath.

In 1908 Karl Kupelwieser, Ludwig Wittgenstein's uncle, donated the money to construct this building and turn Austria- Hungary into the principal destination for the study of radium. Above the doorway the edifice still bears the name of this founding purpose. But since 2005 this has been home of the Institut für Quantenoptik und Quanteninformation (IQOQI, pronounced "ee-ko-kee"), a center devoted to the foundations of quantum mechanics. The IQOQI, which includes a sister facility to the southwest in the valley town of Innsbruck, was initially realized in 2003 at the behest of the Austrian Academy of Sciences. However, the institute's conception several years earlier was predominantly due to one man: Anton Zeilinger. This past January, Zeilinger became the first ever recipient of the Isaac Newton Medal for his pioneering contributions to physics as the head of one of the most successful quantum optics groups in the world. Over the past two decades, he and his colleagues have done as much as anyone else to test quantum mechanics. And since its inception more than 80 years ago, quantum mechanics has possibly weathered more scrutiny than any theory ever devised. Quantum mechanics appears correct, and now Zeilinger and his group have started experimenting with what the theory means.


Some physicists still find quantum mechanics unpalatable, if not unbelievable, because of what it implies about the world beyond our senses. The theory's mathematics is simple enough to be taught to undergraduates, but the physical implications of that mathematics give rise to deep philosophical questions that remain unresolved. Quantum mechanics fundamentally concerns the way in which we observers connect to the universe we observe. The theory implies that when we measure particles and atoms, at least one of two long-held physical principles is untenable: Distant events do not affect one other, and properties we wish to observe exist before our measurements. One of these, locality or realism, must be fundamentally incorrect.

For more than 70 years, innumerable physicists have tried to disentangle the meaning of quantum mechanics through debate. Now Zeilinger and his collaborators have performed a series of experiments that, while neatly agreeing with the theory's predictions, are reinvigorating these historical dialogues. In Vienna experiments are testing whether quantum mechanics permits a fundamental physical reality. A new way of understanding an already powerful theory is beginning to take shape, one that could change the way we understand the world around us. Do we create what we observe through the act of our observations?

Most of us would agree that there exists a world outside our minds. At the classical level of our perceptions, this belief is almost certainly correct. If your couch is blue, you will observe it as such whether drunk, in high spirits, or depressed; the color is surely independent of the majority of your mental states. If you discovered your couch were suddenly red, you could be sure there was a cause. The classical world is real, and not only in your head. Solipsism hasn't really been a viable philosophical doctrine for decades, if not centuries.

[Echo In Light]

1. It's fairly long ... will read it all later. Thanks for posting

[End Of The Road]

2. So the Allegory of the Dungeon thread, with it's "discussion" of reality...

reappears on page 1 on June 26 (after 18 months gone), and on the 28th you post this.

Forgive me if this wasn't meant to be funny, but I found it hilarious.

The seedmag article was great reading, regardless. Not that I understand quantum physics. But I've always had a suspicion that reality requires consensus.