Logic circuits from zero forcing

@article{Burgarth2014LogicCF,
  title={Logic circuits from zero forcing},
  author={Daniel Burgarth and Vittorio Giovannetti and Leslie Hogben and Simone Severini and Michael Young},
  journal={Natural Computing},
  year={2014},
  volume={14},
  pages={485 - 490}
}
We design logic circuits based on the notion of zero forcing on graphs; each gate of the circuits is a gadget in which zero forcing is performed. We show that such circuits can evaluate every monotone Boolean function. By using two vertices to encode each logical bit, we obtain universal computation. We also highlight a phenomenon of “back forcing” as a property of each function. Such a phenomenon occurs in a circuit when the input of gates which have been already used at a given time step is… 
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