Quantum [Un]Speakables II: 50 Years of Bell's Theorem Mitschnitt einer Veranstaltung am Donnerstag, dem 19. Juni 2014 im Lise Meitner-Hörsaal der Fakultät für Physik der Universität Wien Teil 8: Vortrag von Gregor Weihs: "A GHZ Experiment Under Strict Einstein Locality Conditions" Gregor Weihs ist Professor für Photonik an der Universität Innsbruck. Abstract: Quantum correlations are critical to our understanding of the quantum world, with far-reaching technological and fundamental impact. Many tests of Bell inequalities have studied pairs of correlated particles. However, interest in multi-particle quantum correlations is driving the experimental frontier to test larger systems. All violations to date require supplementary assumptions that open results to loopholes, the closing of which is one of the most important challenges in quantum science. Seminal experiments have closed some loopholes, but no experiment has closed locality loopholes with three or more particles. Here, we close both the locality and freedom-of-choice loopholes by distributing three-photon Greenberger-Horne-Zeilinger entangled states to independent observers. We measured a violation of Mermin’s inequality with parameter 2.77+0.08, violating its classical bound by nine standard deviations. These results are a milestone in multi-party quantum communication and a significant advancement of the foundations of quantum mechanics. INHALT ====== Kapitel Titel Position --------------------------------------------------------------------- 1. Vorspann 00:00:00 2. The Innsbruck experiment 1998 00:00:08 3. GHZ states 00:05:31 4. Mermin's inequality 00:10:46 5. Space-time arrangement 00:16:27 6. technical details and results 00:22:22

Quantenphysik, versteckte Variable, Greenberger-Horne-Zeilinger-Experiment

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