Feb 4: Professor David Kaiser on “Testing Bell’s Inequality with Astrophysical Observations: Addressing the Settings-Independence Loophole”
Title: Testing Bell’s Inequality with Astrophysical Observations: Addressing the Settings-Independence Loophole
Location: 26-214, Thursday Feb. 4, Noon-1pm. Pizza at 11:45!
(Feel free to bring your own cup and plate)
Abstract: Bell’s inequality quantifies the degree to which measurements of parts of a system could be correlated, if the system were governed by “local realism,” that is, if each part carried definite values for observables at all times independent of measurement, and if influences cannot travel faster than light. Quantum mechanics is not compatible with local realism, and correlations of measurements on entangled systems should exceed the limit imposed by Bell’s inequality. A series of ingenious experiments have found results compatible with the predictions of quantum theory. The newest experiments have tested Bell’s inequality while closing both the “locality” and “fair-sampling” loopholes simultaneously, for the first time. In this talk I will focus on the third major loophole, often known as the “settings-independence,” “measurement-independence,” or “freedom of choice” loophole, and introduce a new set of experiments that are presently in preparation to address this last major loophole head-on.
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