CMT Seminar - Paul Kwiat, UIUC - Monday, December 9th - 11:30am, Smith Seminar Room (1080 PRB)

[Longbrake, Patricia]

Please join us for the CMT Seminar presented by Paul Kwiat, University of Illinois-Urbana Champaign on Monday, December 9th at 11:30am in the Smith Seminar Room (1080 PRB).

"The End of Local Realism"

Abstract:   Ever since John Bell showed that quantum mechanics could give different predictions from a local realistic model in an appropriate experiment, there has been wide interest in carrying out such a test.  Unfortunately, to date no truly unambiguous test has ever been completed, due to the existence of two experimental loopholes: the "locality loophole" and the "detection loophole".  Each of these has been closed individually in different experimental systems - photons, atoms, ions, and superconductors - but no system has simultaneously closed each of the loopholes.  Here we present a photon-based experiment that violates the Bell inequality, free of the detection loophole. We also discuss some rather subtle points in performing such an experiment, to ensure that new loopholes do not arise.  Our experiment has some "efficiency overhead", but in its current form probably insufficient to perform a fully loophole-free test of local realism, which requires much larger separations between source and detectors. We discuss possible improvements, as well as the application to device-independent quantum communication, e.g., certified private random number generation. Time permitting, our efforts to turn undergraduates into Schrodinger cats will be discussed.

Thank you,
Trisch

[The Ohio State University]
Trisch Longbrake
Administrative Associate I
Department of Physics Condensed Matter
2196 Physics Research Building, 191 W. Woodruff Ave., Columbus, OH 43210
614-292-2778 Office / 614-292-7557 Fax
longbrake.6 at osu.edu<mailto:longbrake.6 at osu.edu> osu.edu<http://osu.edu/>

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