Information processing in generalized probabilistic theories

  title={Information processing in generalized probabilistic theories},
  author={Jonathan Barrett},
  journal={Physical Review A},
  • J. Barrett
  • Published 28 August 2005
  • Physics
  • Physical Review A
I introduce a framework in which a variety of probabilistic theories can be defined, including classical and quantum theories, and many others. From two simple assumptions, a tensor product rule for combining separate systems can be derived. Certain features, usually thought of as specifically quantum, turn out to be generic in this framework, meaning that they are present in all except classical theories. These include the nonunique decomposition of a mixed state into pure states, a theorem… 

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