2013 Fall Graduate Colloquium Series: Brandon Mattingly

DateNovember 22, 2013
Time12:00 pm
LocationBaylor Sciences Building, Room E.125
Brandon Mattingly

Loophole Free Bell Test of Photons Supplies Evidence for Quantum Non-Locality

In 1935, Einstein, Podolsky, and Rosen published a thought experiment that showed that quantum mechanics must violate one or both of the fundamental classical assumptions of locality and realism. They concluded that quantum mechanics allowed for a message to be passed from one particle to another without affecting any space in between. So, they proposed that quantum
mechanics must therefore be incomplete and some “hidden variables” remained
to be discovered.

But in 1964, Bell devised an inequality to test their assertion. He showed that a “hidden variable” description of quantum mechanics would lead to severe restrictions on the allowed correlations between sending and receiving
messages in quantum mechanical experiments. One specific case being those between entangled particles such as photons. If performed under sufficiently ideal conditions, a violation of Bell’s inequality would conclusively rule out all
possible local realistic quantum theories.

In this talk, the paper “Detection-Loophole-Free Test of Quantum Nonlocality, and Applications” 10.1103/PhysRevLett.111.130406 will be discussed. It details an experiment that uses entangled photons to violate the Bell inequality to the 7ó level. Consequently, the experiment provides significant evidence for the non-local nature of
quantum mechanics.

For more information, please contact: Dr. Ken Park 254-710-2282

PublisherDepartment of Physics
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