A Bell inequality analog in quantum measure theory

@article{Craig2007ABI,
  title={A Bell inequality analog in quantum measure theory},
  author={David Craig and Fay Dowker and Joe Henson and Seth A. Major and David Rideout and Rafael D. Sorkin},
  journal={Journal of Physics A},
  year={2007},
  volume={40},
  pages={501-523}
}
One obtains Bell's inequalities if one posits a hypothetical joint probability distribution, or measure, whose marginals yield the probabilities produced by the spin measurements in question. The existence of a joint measure is in turn equivalent to a certain causality condition known as 'screening off'. We show that if one assumes, more generally, a joint quantal measure, or 'decoherence functional', one obtains instead an analogous inequality weaker by a factor of . The proof of this 'Tsirel… 
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