23 research outputs found
Quantum and Superquantum Nonlocal Correlations
We present a simple hidden variable model for the singlet state of a pair of
qubits, characterized by two kinds, hierarchically ordered, of hidden
variables. We prove that, averaging over both types of variables, one
reproduces all the quantum mechanical correlations of the singlet state. On the
other hand, averaging only over the hidden variables of the lower level, one
obtains a general formal theoretical scheme exhibiting correlations stronger
than the quantum ones, but with faster-than-light communication forbidden. This
result is interesting by itself since it shows that a violation of the quantum
bound for nonlocal correlations can be implemented in a precise physical manner
and not only mathematically, and it suggests that resorting to two levels of
nonlocal hidden variables might led to a deeper understanding of the physical
principles at the basis of quantum nonlocality.Comment: 5 pages, 1 figure. Submitted for publicatio