Quantum Information Seminar | May 13, 16:00
What does teleportation tell us about the relationship between Nature and quantum theory?
The search for a physical principle that yields quantum mechanics (QM) as the correct description of Nature has been a long-standing problem in the foundations of QM. The seminal work of John S. Bell (1964) together with that of B. S. Tsirelson (1980) proved that Nature is at least as complicated as QM. Nevertheless, the question of whether QM is sufficient to describe Nature is still open.
Bell inequality violation predicted by QM tend to be strictly smaller than the algebraically maximal value. Thus, one of the most prominent approaches to this problem is to try to explain why algebraically maximal violations of Bell inequalities can generally not be achieved in Nature. In 2020, M. Weilenmann and R. Colbeck suggested that the the reason for this is teleportation. In this seminar I aim to (i) justify why this conjecture is among the most promising ones, (ii) tell you how we disproved it, and (iii) why, despite our counterexample, it might nonetheless be the right answer.
University of Cologne
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Contact: Markus Heinrich