Wigner Function Negativity and Contextuality in Quantum Computation on Rebits

@article{Delfosse2014WignerFN,
  title={Wigner Function Negativity and Contextuality in Quantum Computation on Rebits},
  author={Nicolas Delfosse and Philippe Allard Gu{\'e}rin and Jacob Bian and Robert Raussendorf},
  journal={Physical Review X},
  year={2014},
  volume={5},
  pages={021003}
}
Quantum computation commonly relies on qubits, but rebits---states with real density matrices---can be used as well. Researchers show how the contextuality of two-level states is necessary for quantum computation. 

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