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Seminário do grupo de Óptica e Informação Quântica

Data: Sexta-Feira 30/11/2018, Sala A5-01, 11 am.

Palestrante: Victor Avalos  (PUC, Lima)

Title: PR box:  non-locality beyond quantum mechanics

Abstract: Non-locality has been a very controversial feature since the
appereance of quantum mechanics, and recent research has shown this
won't change.
In 1994, Popescu and Rhorlich asked themselves if quantum mechanics was
the only theory capable of reconciling relativistic causality and
non-locality. They found not only that there existed other set of
theories that meet that criteria, but that these could allow to surpass
Tsirelson's bound in a Bell test. The correlations that are capable of
surpassing this quantum bound are known as PR-boxes (also known as
super-quantum correlations).
Since this PR-boxes don't belong to quantum mechanics, they can't be
obtained directly from experiment. Nevertheless, it has been shown that
PR-boxes can be simulated using a quantum mechanical bipartite systems,
but with the addition that the probabilities are determined by pre and
post-selection. This can be seen as using a detection loop-hole (in the
Bell test) in order to systematically change the correlations between
the parties and consquently lead to surpass the quantum bound and even
obtain a maximal violation of the CHSH inequallity (S=4).