  A physical explanation for quantum bounds to nonlocality (Tsirelson's bound)
is a fundamental problem that remains open, and one approach to explaining its
origins is the so-called Exclusivity principle, relying on probabilistic
assumptions shaping general probabilistic theories through sharp measurements
and compatible (non-local) measurements. Information indistinguishability,
presented here as indistinguishability of qubits and more general bits, may
serve as an answer to the nonlocality conundrum, ultimately placing it as the
origin to quantum limits. We connect indistinguishability to the exclusivity
principle and show that indistinguishability leads to quantum bounds. With
that, we suggest indistinguishability to be as fundamental as non-locality and
relativistic causality for nonlocal realism.
