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Physics World

Entangled test

Thomas D. Angelidis

Published Jul 1, 2003• 0 citations
Publisher

Abstract

In his review of Amir Aczel's new book (May p48),Anton Zeilinger admirably sums up the story of entanglement by stating that "this field of research...came into being through the raising of 'mere' philosophical questions" and that "such questions can lead to truly novel and interesting developments – particularly if answering these questions can be brought out of the realm of Gedanken experiments and into the real physics laboratory".

DOI
10.1088/2058-7058/16/7/27

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In his review of Amir Aczel's new book (May p48),Anton Zeilinger admirably sums up the story of entanglement by stating that "this field of research...came into being through the raising of 'mere' philosophical questions" and that "such questions can lead to truly novel and interesting developments – particularly if answering these questions can be brought out of the realm of Gedanken experiments and into the real physics laboratory".
Abstract The interest in foundations ran headlong into 1960s New Age spiritualism. The Fundamental Fysiks Group (FFG) was formed in 1975, its early recruits turning their joblessness into the productive probing of foundational questions. The FFG championed Bell: three-quarters of the papers published about his theorem and inequalities during the 1970s came from FFG members. A ‘thinkshop’ organized in Erice in 1976 brought together Clauser and Shimony, among others, and two newcomers, Alain Aspect and Anton Zeilinger. Sympathetic to Einstein, and confused by Bohr, Aspect had set himself the task to perform the ultimate Bell test in which the experimental settings are changed whilst the entangled particles are in flight. The results, published in 1982, sealed the slow recognition that had dawned over the previous decade: quantum entanglement and non-locality are real phenomena. The ‘Aspect experiments’ became iconic, just as efforts were getting under way to exploit entanglement in quantum computing and cryptography.
Hi, I’m Adam Becker, PhD, an astrophysicist and science writer. My new book, What Is Real? The Unfinished Quest for the Meaning of Quantum Physics, is about the scientists who bucked the establishment and looked for a better way to understand what quantum mechanics is telling us about the nature of reality. It’s a history of quantum foundations from the initial development of quantum mechanics to the present, focusing on some people who don’t often get the spotlight in most books on quantum history: David Bohm, Hugh Everett III, John Bell, and the people who came after them (e.g. Clauser, Shimony, Zeh, Aspect). I’m happy to talk about all of their work: the physics, the history, the philosophy, and more. FWIW, I don’t subscribe to any particular interpretation, but I’m not a fan of the “Copenhagen interpretation” (which isn’t even a single coherent position anyhow). Please don’t shy away if you disagree. Feel free to throw whatever you’ve got at me, and let’s have a fun, engaging, and respectful conversation on one of the most contentious subjects in physics. Or just ask whatever else you want to ask—after all, this is AMA. Edit, 2PM Eastern: Gotta step away for a bit. I’ll be back in an hour or so to answer more questions. Edit, 6:25PM Eastern: Looks like I’ve answered all of your questions so far, but I’d be happy to answer more. I’ll check back in another couple of hours. Edit, 11:15PM Eastern: OK, I’m out for the night, but I’ll check in again tomorrow morning for any final questions.
Physics Scratches a Philosopher's Itch Philosopher Elise Crull muses over interpretations of quantum physics, focusing on experiments that cast doubt on our classical notions of causality.By Michael Schirber W hich came first, the chicken or the egg?Both, says Elise Crull, who bases her answer on recent experiments that show that causal sequences can get mixed up in quantum circuits.A philosopher of physics at The City College of New York, Crull studies the results of experiments like these to try and tease out their meaning.Can causality coexist with quantum uncertainty?Why does the arrow of time point in one direction?Crull says that she doesn't yet know the answers to these questions, but she thinks scientists could benefit from pondering such riddles.