Hall 123

Nonlocal and Noncausal correlations: fundamental perspective and applications

Manik Banik

IMSc

The correlations cry for explanation”--J.S. Bell; and he was
right. In classical physics we know that the long-range correlations
between measurements on two non-interacting physical systems can be
correlated due to their common history and for various conservation laws.
However all quantum long range correlations can not be explained by some
supplementary variables describing the behavior of the individual physical
systems during the experiment in which the memory of the common history
could be stored. This, commonly known as 'quantum nonlocality', is one of
the core research topic of quantum foundations. In this talk I will discuss
advantages of this nonlocal correlations over its classical counterpart in
some practical tasks. In particular I will discuss about their privileged
uses in Bayesian game theory and measurement device independent randomness
certification. I will also talk about another form of counter-intuitive
correlations, namely 'noncausal' correlations, which goes against our usual
perception of the physical world that events are ordered with respect to
some global time parameter. This is one of the very interesting
developments in recent time which in some sense provides a quantum
mechanical version of dynamical causal structure of general relativity.