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Center for Astrophysics Research and Technologies Seminar Series Information


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How to count one photon and get a result of 1000 -- and other experiments on quantum measurement

Thursday April 11, 2019
3:30 pm

 Presenter:  Aephraim Steinberg, University of Toronto
 Series:  CQuIC Seminars
 Abstract:  I will present experiments studying the results of quantum measurements carried out on post-selected systems.
In 1988, Aharonov, Albert, and Vaidman introduced a new paradigm of quantum measurement in a paper which had the unwieldy but provocative title “How the result of a measurement of a component of the spin of a spin-1/2 particle can turn out to be 100.”
However, nearly all of the experiments carried out so far on their so-called “weak measurements" could be alternatively understood in terms of the classical (electromagnetic wave) theory of optics. I will present the first experiment in which a measurement apparatus deterministically entangles two distinct optical beams, enabling us to experimentally address a question directly analogous to that of the original proposal: “In a two-arm interferometer containing one photon in total, can the result of a measurement of the photon number in one arm turn out to be greater than 1?”
The answer proves to be yes.
 Host:  Ivan Deutsch
 Location:  Room 190, Physics & Astronomy

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