  We study the quantum mechanical correlation between two identical neutralinos
in the decays of minimal supersymmetric standard model (MSSM) scalar tau (stau)
pair produced in e+e- annihilation. Generally, the decay products of scalar
(spinless) particles are not correlated. We show that a correlation between two
neutralinos appears near pair production threshold, due to a finite stau width
and mixing of the staus and/or neutralinos, and because the neutralinos are
Majorana. Because the correlation is significant only in a specific kinematical
configuration, it can be observed only in supersymmetric models where the
neutralino momenta can be kinematically reconstructed, such as in models with
R-parity violation.
