We are non-commercial, all volunteer and supported by our readers. Please help sustain the Dew by making a donation.
Science’s Sacred Cows: Realism
In the previous post, we discussed a fiendishly clever gedanken experiment posed in 1935 by Einstein and co-workers and designed to expose presumed flaws in quantum mechanics (QM). When the so-called “EPR paradox” was finally tested experimentally in 1977 at Lawrence Berkeley Laboratory, the results were a resounding victory for QM, while ringing the death knell for Einstein’s cherished principle of local causes. The “EPR paradox” — and Bell’s Theorem, which ultimately led to its resolution — firmly established the notion of quantum entanglement. Further experiments over the past three decades have moved entanglement from the status of novelty into the mainstream of physics. Today we discuss further experiments involving entanglement that call into question another of science’s tacit assumptions: realism.
Realism is the philosophical stance of most sane human beings, scientists included. Realism asserts: “All measurement outcomes depend on pre-existing properties of objects that are independent of the measurement.” In layman’s terms, there’s a real world out there independent of us (although we may see it differently because of variations in our measurement devices, i.e., our eyes and lenses). After all, if I ski down a slope and collide with a tree in my path, it makes little difference whether or not I believe the tree is real. Most persons — a few Zen philosophers excepted (“What sound does a falling tree make if no one hears?”) would assert that the tree has a reality all its own, independent of me. But in the microscopic world of the quantum, things are so very different than our macroscopic experiences would lead us to believe.
Recall from the previous post that the paper by Einstein, Podolsky, and Rosen (hence the moniker “EPR”) involved two-particle (say two photon) systems in which twin particles are spatially separated by a vast distance. Certain implications of QM, fretted Einstein, suggested that measuring the polarization of one photon would instantaneously set the polarization of its twin, violating the principle of local causes.
Let’s carefully parse Einstein’s words when he sprang the EPR trap to conclude that QM is incomplete.
“One can escape from this conclusion [that quantum theory is incomplete] only by either assuming the measurement of [photon 1 telepathically] changes the real situation at [photon 2] or by denying independent real situations as such to things which are spatially separated from each other. Both alternatives appear to me entirely unacceptable.”
By referring to “the real situation” and “independent real situations,” Einstein explicitly assumed physical realism. Furthermore, by assuming that spatially separated particles could not instantly “communicate,” he invoked the principle of local causes. Thus Einstein made two fundamental and independent assumptions: locality and realism.
Because of the profound implications of entanglement, researchers around the world continue to propose and conduct experiments to further clarify the remarkable phenomenon. To summarize their collective results prior to 2007: experiments based upon Bell’s Theorem prove “that all hidden-variable theories based on the joint assumption of locality and realism [emphases added] are at variance with the predictions of quantum mechanics.” The logical conclusion from these results is that theories based on local realism fail to be consistent with the predictions of QM because at least one assumption fails. But which?
In 2007, a group of researchers at premier institutions in Austria and Poland collaborated to perform yet another stunning EPR-like investigation. The experiment, by Simon Gröblacher and a host of coworkers, tested a new theorem by A. Leggett (2003) that further refines Bell’s theorem. Leggett’s theorem yields a mathematical inequality that, when combined with Bell’s inequality, permits the independent testing of Einstein’s two assumptions: locality and realism. The results of Gröblacher’s team, published in Nature (April 19, 2007), once again validated quantum mechanical predictions. That was to be expected. The unexpected occurred in identifying which assumption of local realism failed. Locality or realism? Surprisingly, both. The authors concluded:
“Our result suggests that giving up the concept of locality is not sufficient to be consistent with quantum experiments, unless certain intuitive features of realism are [also] abandoned.”
An independent reality, it now appears, has become the latest casualty of QM. The universe is nonlocal, nondeterministic, and apparently “unreal” as well. Haldane was right: the universe, at least at the quantum level, is “queerer” than we can imagine.
- Image: Licensed by LikeTheDew.com at 123RF.com
Worthy of Comment
Also on the Dew
If you have noticed your TV smelling a little mildewy lately, or have found tendrils of Spanish moss clogging your TiVo, there is a perfectly good reason – the basic cable producers have discovered the Louisiana swamps; and like the Nazis who invaded Poland, they are not going to settle for just one kielbasa. Even though there is an old saying that if you’ve seen one alligator, you’ve seen them all, evidently Hollywood TV producers can tell the difference; granted, they are experts at dealing with thick-skinned carnivores after their experiences with the Kardashians, various cold-blooded housewives, and beady-eyed reptilian denizens of th Read on →
In case you’re emerging from a coma over the last couple of months and somehow missed the change, it’s the tourist season again. The signs are everywhere – but, alas, mostly here at the beach. Gone are the days, for a while at least, when I could walk on the beach with my dog ’Dro (short for Pedro) and meet up with no one but myself. Good place for doing that. The late, great Southern humorist Lewis Grizzard wrote memorably that on a back road in Georgia at night, you could ask yourself a question and get an honest answer. In South Carolina, a beach w Read on →
Many people say that English is the hardest language to understand because so many words can mean different things and we often need a sentence to explain one word in another language. For example, in the US it is quite common for people to publicly “root for the team.” In other English-speaking countries if you are caught doing that you will be arrested. In Australia to call someone “an old bastard” is a term of endearment. But in some other English-speaking countries it could be the first few words in an argument or the last words before a fight. In the US Read on →
At the beginning of 1997 I bought a new car. It was modest in price and style, but automatic and practical for a woman living in London. It was easy to park, small enough to fit in the narrowest spaces and comfortable to drive: a navy blue Daihatsu Charade that would not attract thieves or envy. I got it at a bargain price because one of my sons worked for a dealership. It was zippy in traffic, when traffic allowed. British roads are narrower and more congested than American ones, this small island being packed with a population of 63 million. Read on →