Bell's Inequalities and Density Matrices: Revealing "Hidden" Nonlocality.

@article{Popescu1995BellsIA,
  title={Bell's Inequalities and Density Matrices: Revealing "Hidden" Nonlocality.},
  author={Popescu},
  journal={Physical review letters},
  year={1995},
  volume={74 14},
  pages={
          2619-2622
        }
}
  • Popescu
  • Published 5 February 1995
  • Physics
  • Physical review letters
Standard Bell inequalities apply to correlations arising when two or more macroscopically separated systems are each subjected to a single ideal measurement. While these inequalities demonstrate that quantum mechanics and local hidden variable theories yield incompatible predictions for pure states, they fail for mixed states: For mixed states, correlations arising from a single ideal measurement on each system may obey standard Bell inequalities, yet when each system is subjected to a sequence… 
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